NEWT Lifecycle remodel: Window destroy() !

NEWT's removed:
   Window:         destoy(boolean unrecoverable)
   Display/Screen: get/set DestroyWhenUnused(boolean)

We behave as follows:
   - Window.destroy() always decr Screen's reference counter,
     which issues destruction when reached zero.
     Then Screen does the same for Display ..

   - Window.destroy() keeps alive all references,
     hence it can be always recreated via setVisible(true).

   - Window.destroy() ensures Display's EDT is stopped
     if display is destroyed.

   - Window.invalidate() actually removes all Object reference,
     hence it cannot be recreated or used after it.
     This method exist to support a way to cleanup memory, GC.

All test passed on Linux/X11 and Windows

39 files changed, 503 insertions, 551 deletions

diff --git a/make/scripts/tests.sh b/make/scripts/tests.sh
index 93deeab83..d61435d67 100644
--- a/make/scripts/tests.sh
+++ b/make/scripts/tests.sh
@@ -36,6 +36,7 @@ function jrun() {
     #D_ARGS="-Dnewt.debug.Screen -Dnewt.debug.EDT -Djogamp.debug.Lock"
     #D_ARGS="-Dnewt.debug.EDT"
     #D_ARGS="-Djogl.debug=all -Dnativewindow.debug=all -Dnewt.debug=all"
+    D_ARGS="-Dnewt.debug=all"
     X_ARGS="-Dsun.java2d.noddraw=true -Dsun.java2d.opengl=false"
     java $awtarg $X_ARGS $D_ARGS $* 2>&1 | tee -a java-run.log
 }
@@ -59,6 +60,7 @@ function testawt() {
 #testawt com.jogamp.test.junit.jogl.acore.TestGLProfile01NEWT $*
 #testawt com.jogamp.test.junit.jogl.demos.gl2.gears.newt.TestGearsNEWT
 #testawt com.jogamp.test.junit.newt.TestDisplayLifecycle01NEWT
+#testawt com.jogamp.test.junit.newt.TestDisplayLifecycle02NEWT
 testawt com.jogamp.test.junit.newt.parenting.TestParenting01NEWT
 #testawt com.jogamp.test.junit.newt.parenting.TestParenting02NEWT
 #testawt com.jogamp.test.junit.newt.TestScreenMode00NEWT
diff --git a/src/junit/com/jogamp/test/junit/jogl/acore/TestGLProfile01NEWT.java b/src/junit/com/jogamp/test/junit/jogl/acore/TestGLProfile01NEWT.java
index 0c64cfdf2..860a181a4 100644
--- a/src/junit/com/jogamp/test/junit/jogl/acore/TestGLProfile01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/jogl/acore/TestGLProfile01NEWT.java
@@ -150,7 +150,7 @@ public class TestGLProfile01NEWT extends UITestCase {
         glWindow.setSize(128, 128);
         glWindow.setVisible(true);
         glWindow.display();
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
     public static void main(String args[]) throws IOException {
diff --git a/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNEWT.java b/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNEWT.java
index f88d4d16f..d83deea4b 100644
--- a/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNEWT.java
+++ b/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNEWT.java
@@ -101,7 +101,7 @@ public class TestGearsNEWT extends UITestCase {
         }
 
         animator.stop();
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
     @Test
diff --git a/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNewtAWTWrapper.java b/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNewtAWTWrapper.java
index c965d5c21..ef4b657fc 100644
--- a/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNewtAWTWrapper.java
+++ b/src/junit/com/jogamp/test/junit/jogl/demos/gl2/gears/newt/TestGearsNewtAWTWrapper.java
@@ -89,7 +89,7 @@ public class TestGearsNewtAWTWrapper extends UITestCase {
         }
 
         animator.stop();
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
     @Test
diff --git a/src/junit/com/jogamp/test/junit/jogl/drawable/TestDrawable01NEWT.java b/src/junit/com/jogamp/test/junit/jogl/drawable/TestDrawable01NEWT.java
index 95db913ab..9b6194ca6 100644
--- a/src/junit/com/jogamp/test/junit/jogl/drawable/TestDrawable01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/jogl/drawable/TestDrawable01NEWT.java
@@ -145,7 +145,7 @@ public class TestDrawable01NEWT extends UITestCase {
 
         // GLWindow.destroy(..) sequence cont..
         Assert.assertNotNull(window);
-        window.destroy(true); // incl screen + display
+        window.invalidate();
 
         drawable = null;
         context = null;
diff --git a/src/junit/com/jogamp/test/junit/jogl/newt/TestSwingAWTRobotUsageBeforeJOGLInitBug411.java b/src/junit/com/jogamp/test/junit/jogl/newt/TestSwingAWTRobotUsageBeforeJOGLInitBug411.java
index 79d899b6c..8f56f6f46 100644
--- a/src/junit/com/jogamp/test/junit/jogl/newt/TestSwingAWTRobotUsageBeforeJOGLInitBug411.java
+++ b/src/junit/com/jogamp/test/junit/jogl/newt/TestSwingAWTRobotUsageBeforeJOGLInitBug411.java
@@ -265,10 +265,10 @@ public class TestSwingAWTRobotUsageBeforeJOGLInitBug411 extends UITestCase {
         anim1.start();
         runTestGL(newtCanvasAWT, win1);
 
-        win0.destroy(true);
+        win0.destroy();
         Assert.assertEquals(false, anim0.isAnimating());
 
-        newtCanvasAWT.destroy(true);
+        newtCanvasAWT.destroy();
         Assert.assertEquals(false, anim1.isAnimating());
 
         System.err.println("TestSwingAWTRobotUsageBeforeJOGLInitBug411.test01NewtCanvasAWT(): End");
@@ -303,7 +303,7 @@ public class TestSwingAWTRobotUsageBeforeJOGLInitBug411 extends UITestCase {
         Assert.assertEquals(false, anim1.isAnimating());
 
         /**
-        win0.destroy(true);
+        win0.destroy();
         Assert.assertEquals(false, anim0.isAnimating());
          */
         
diff --git a/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle01NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle01NEWT.java
index 44b4e7325..94f915834 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle01NEWT.java
@@ -92,7 +92,7 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         return glWindow;
     }
 
-    private void testDisplayCreate01(Display display, Screen screen, boolean destroyWhenUnused) throws InterruptedException {
+    private void testDisplayCreate01(Display display, Screen screen) throws InterruptedException {
         // start-state == end-state
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
         Assert.assertEquals(0,display.getReferenceCount());
@@ -102,13 +102,6 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         Assert.assertEquals(0,screen.getReferenceCount());
         Assert.assertEquals(false,screen.isNativeValid());
 
-        // Setup/Verify default DestroyWhenUnused behavior
-        if(destroyWhenUnused) {
-            screen.setDestroyWhenUnused(true);
-        }
-        Assert.assertEquals(destroyWhenUnused,display.getDestroyWhenUnused());
-        Assert.assertEquals(destroyWhenUnused,screen.getDestroyWhenUnused());
-
         // Create Window, pending lazy native creation
         GLWindow window = createWindow(screen, caps, width, height);
         Assert.assertEquals(screen,window.getScreen());
@@ -118,6 +111,9 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         Assert.assertEquals(true,display.getEDTUtil().isRunning());
         Assert.assertEquals(0,screen.getReferenceCount());
         Assert.assertEquals(false,screen.isNativeValid());
+
+        Assert.assertNotNull(window.getScreen());
+        Assert.assertEquals(true,window.isValid());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
@@ -163,16 +159,17 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         }
         System.err.println("duration: "+window.getDuration());
 
-        // recoverable destruction, ie Display/Screen untouched
-        window.destroy(false);
+        // destruction ..
+        window.destroy();
         Assert.assertEquals(screen,window.getScreen());
-        Assert.assertEquals(1,Display.getActiveDisplayNumber());
-        Assert.assertEquals(1,display.getReferenceCount());
-        Assert.assertEquals(true,display.isNativeValid());
+        Assert.assertEquals(0,Display.getActiveDisplayNumber());
+        Assert.assertEquals(0,display.getReferenceCount());
+        Assert.assertEquals(false,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
-        Assert.assertEquals(true,display.getEDTUtil().isRunning());
-        Assert.assertEquals(1,screen.getReferenceCount());
-        Assert.assertEquals(true,screen.isNativeValid());
+        Assert.assertEquals(false,display.getEDTUtil().isRunning());
+        Assert.assertEquals(0,screen.getReferenceCount());
+        Assert.assertEquals(false,screen.isNativeValid());
+        Assert.assertEquals(true, window.isValid());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
         window.resetCounter();
@@ -205,35 +202,9 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         }
         System.err.println("duration: "+window.getDuration());
 
-        // unrecoverable destruction, ie Display/Screen will be unreferenced
-        window.destroy(true);
-        Assert.assertEquals(null,window.getScreen());
+        // destruction ..
+        window.destroy();
         display.dumpDisplayList("Post destroy(true)");
-        if(!destroyWhenUnused) {
-            // display/screen untouched when unused, default
-            Assert.assertEquals(1,Display.getActiveDisplayNumber());
-            Assert.assertEquals(1,display.getReferenceCount());
-            Assert.assertEquals(true,display.isNativeValid());
-            Assert.assertNotNull(display.getEDTUtil());
-            Assert.assertEquals(true,display.getEDTUtil().isRunning());
-            Assert.assertEquals(0,screen.getReferenceCount());
-            Assert.assertEquals(true,screen.isNativeValid());
-
-            // manual destruction: Screen
-            screen.destroy();
-            Assert.assertEquals(1,Display.getActiveDisplayNumber());
-            Assert.assertEquals(0,display.getReferenceCount());
-            Assert.assertEquals(true,display.isNativeValid());
-            Assert.assertNotNull(display.getEDTUtil());
-            Assert.assertEquals(true,display.getEDTUtil().isRunning());
-            Assert.assertEquals(0,screen.getReferenceCount());
-            Assert.assertEquals(false,screen.isNativeValid());
-
-            // manual destruction: Display
-            display.destroy();
-        } else {
-            // display/screen destroyed when unused
-        }
 
         // end-state == start-state
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
@@ -244,32 +215,21 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         Assert.assertEquals(0,screen.getReferenceCount());
         Assert.assertEquals(false,screen.isNativeValid());
 
+        Assert.assertNotNull(window.getScreen());
+        Assert.assertEquals(true,window.isValid());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
     }
 
     @Test
-    public void testDisplayCreate01_DestroyWhenUnused_False() throws InterruptedException {
-        Assert.assertEquals(0,Display.getActiveDisplayNumber());
-
-        // Create Display/Screen, pending lazy native creation
-        Display display = NewtFactory.createDisplay(null);
-        Screen screen  = NewtFactory.createScreen(display, 0); // screen 0
-        testDisplayCreate01(display, screen, false);
-        testDisplayCreate01(display, screen, false);
-
-        Assert.assertEquals(0,Display.getActiveDisplayNumber());
-    }
-
-    @Test
-    public void testDisplayCreate01_DestroyWhenUnused_True() throws InterruptedException {
+    public void testDisplayCreate01_AutoDestroyLifecycle() throws InterruptedException {
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
         // Create Display/Screen, pending lazy native creation
         Display display = NewtFactory.createDisplay(null);
         Screen screen  = NewtFactory.createScreen(display, 0); // screen 0
-        testDisplayCreate01(display, screen, true);
-        testDisplayCreate01(display, screen, true);
+        testDisplayCreate01(display, screen);
+        testDisplayCreate01(display, screen);
 
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
     }
@@ -298,17 +258,7 @@ public class TestDisplayLifecycle01NEWT extends UITestCase {
         }
         System.err.println("durationPerTest: "+durationPerTest);
         String tstname = TestDisplayLifecycle01NEWT.class.getName();
-        org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(new String[] {
-            tstname,
-            "filtertrace=true",
-            "haltOnError=false",
-            "haltOnFailure=false",
-            "showoutput=true",
-            "outputtoformatters=true",
-            "logfailedtests=true",
-            "logtestlistenerevents=true",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.PlainJUnitResultFormatter",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter,TEST-"+tstname+".xml" } );
+        org.junit.runner.JUnitCore.main(tstname);
     }
 
 }
diff --git a/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle02NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle02NEWT.java
index 7253b7353..9fc6e3bc9 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle02NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestDisplayLifecycle02NEWT.java
@@ -94,9 +94,6 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Screen screen = window.getScreen();
         Display display = screen.getDisplay();
 
-        Assert.assertEquals(true,display.getDestroyWhenUnused());
-        Assert.assertEquals(true,screen.getDestroyWhenUnused());
-
         Assert.assertEquals(screen,window.getScreen());
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
         Assert.assertEquals(0,display.getReferenceCount());
@@ -151,19 +148,22 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         }
         System.err.println("duration: "+window.getDuration());
 
-        // recoverable destruction, ie Display/Screen untouched
-        window.destroy(false);
+        // destruction.. ref count down, but keep all
+        window.destroy();
         Assert.assertEquals(screen,window.getScreen());
-        Assert.assertEquals(1,Display.getActiveDisplayNumber());
-        Assert.assertEquals(1,display.getReferenceCount());
-        Assert.assertEquals(true,display.isNativeValid());
+        Assert.assertEquals(0,Display.getActiveDisplayNumber());
+        Assert.assertEquals(0,display.getReferenceCount());
+        Assert.assertEquals(false,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
-        Assert.assertEquals(true,display.getEDTUtil().isRunning());
-        Assert.assertEquals(1,Screen.getActiveScreenNumber());
-        Assert.assertEquals(1,screen.getReferenceCount());
-        Assert.assertEquals(true,screen.isNativeValid());
+        Assert.assertEquals(false,display.getEDTUtil().isRunning());
+        Assert.assertEquals(0,Screen.getActiveScreenNumber());
+        Assert.assertEquals(0,screen.getReferenceCount());
+        Assert.assertEquals(false,screen.isNativeValid());
+        Assert.assertNotNull(window.getScreen());
+        Assert.assertEquals(true,window.isValid());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
+
         window.resetCounter();
         Assert.assertEquals(0, window.getTotalFrames());
 
@@ -179,6 +179,7 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Assert.assertEquals(screen,window.getScreen());
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
         Assert.assertEquals(1,display.getReferenceCount());
+        Assert.assertEquals(true,window.isValid());
         Assert.assertEquals(true,display.isNativeValid());
         Assert.assertEquals(true,display.getEDTUtil().isRunning());
         Assert.assertEquals(1,Screen.getActiveScreenNumber());
@@ -195,9 +196,10 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         }
         System.err.println("duration: "+window.getDuration());
 
-        // unrecoverable destruction, ie Display/Screen will be unreferenced
-        window.destroy(true);
-        Assert.assertEquals(null,window.getScreen());
+        // destruction + invalidate, ie Display/Screen will be unreferenced
+        window.invalidate();
+        Assert.assertNull(window.getScreen());
+        Assert.assertEquals(false,window.isValid());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
@@ -240,9 +242,6 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Assert.assertSame(display, window2.getScreen().getDisplay());
         window2.setPosition(screen.getWidth()-width, 0);
 
-        Assert.assertEquals(true,display.getDestroyWhenUnused());
-        Assert.assertEquals(true,screen.getDestroyWhenUnused());
-
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
         Assert.assertEquals(0,display.getReferenceCount());
         Assert.assertEquals(false,display.isNativeValid());
@@ -297,9 +296,10 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Assert.assertEquals(true,window1.isNativeValid());
         Assert.assertEquals(false,window1.isVisible());
 
-        // unrecoverable destruction, ie Display/Screen will be unreferenced
-        window1.destroy(true);
-        Assert.assertEquals(null,window1.getScreen());
+        // destruction ...
+        window1.destroy();
+        Assert.assertNotNull(window1.getScreen());
+        Assert.assertEquals(true,window1.isValid());
         Assert.assertEquals(false,window1.isNativeValid());
         Assert.assertEquals(false,window1.isVisible());
 
@@ -312,9 +312,10 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Assert.assertEquals(1,screen.getReferenceCount());
         Assert.assertEquals(true,screen.isNativeValid());
 
-        // unrecoverable destruction, ie Display/Screen will be unreferenced
-        window2.destroy(true);
-        Assert.assertEquals(null,window2.getScreen());
+        // destruction
+        window2.destroy();
+        Assert.assertNotNull(window2.getScreen());
+        Assert.assertEquals(true,window2.isValid());
         Assert.assertEquals(false,window2.isNativeValid());
         Assert.assertEquals(false,window2.isVisible());
 
@@ -328,6 +329,20 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         Assert.assertEquals(0,screen.getReferenceCount());
         Assert.assertEquals(false,screen.isNativeValid());
 
+        // invalidate .. remove all refs
+        window1.invalidate();
+        Assert.assertNull(window1.getScreen());
+        Assert.assertEquals(false,window1.isValid());
+        Assert.assertEquals(false,window1.isNativeValid());
+        Assert.assertEquals(false,window1.isVisible());
+
+        // invalidate .. remove all refs
+        window2.invalidate();
+        Assert.assertNull(window2.getScreen());
+        Assert.assertEquals(false,window2.isValid());
+        Assert.assertEquals(false,window2.isNativeValid());
+        Assert.assertEquals(false,window2.isVisible());
+
     }
 
     @Test
@@ -365,17 +380,7 @@ public class TestDisplayLifecycle02NEWT extends UITestCase {
         }
         System.err.println("durationPerTest: "+durationPerTest);
         String tstname = TestDisplayLifecycle02NEWT.class.getName();
-        org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(new String[] {
-            tstname,
-            "filtertrace=true",
-            "haltOnError=false",
-            "haltOnFailure=false",
-            "showoutput=true",
-            "outputtoformatters=true",
-            "logfailedtests=true",
-            "logtestlistenerevents=true",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.PlainJUnitResultFormatter",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter,TEST-"+tstname+".xml" } );
+        org.junit.runner.JUnitCore.main(tstname);
     }
 
 }
diff --git a/src/junit/com/jogamp/test/junit/newt/TestEventSourceNotAWTBug.java b/src/junit/com/jogamp/test/junit/newt/TestEventSourceNotAWTBug.java
index 8776b7be8..ff791b03a 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestEventSourceNotAWTBug.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestEventSourceNotAWTBug.java
@@ -88,7 +88,7 @@ public class TestEventSourceNotAWTBug extends UITestCase {
                 f_jf.dispose();
             }
         });
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
     public static void main(String args[]) throws IOException {
diff --git a/src/junit/com/jogamp/test/junit/newt/TestFocus01SwingAWTRobot.java b/src/junit/com/jogamp/test/junit/newt/TestFocus01SwingAWTRobot.java
index 762e906fc..d597af889 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestFocus01SwingAWTRobot.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestFocus01SwingAWTRobot.java
@@ -175,7 +175,7 @@ public class TestFocus01SwingAWTRobot extends UITestCase {
         // Shutdown the test.
         animator.stop();
         frame1.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     static int atoi(String a) {
diff --git a/src/junit/com/jogamp/test/junit/newt/TestFocus02SwingAWTRobot.java b/src/junit/com/jogamp/test/junit/newt/TestFocus02SwingAWTRobot.java
index 3ce6080a9..b96279cac 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestFocus02SwingAWTRobot.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestFocus02SwingAWTRobot.java
@@ -261,7 +261,7 @@ public class TestFocus02SwingAWTRobot extends UITestCase {
                     _jFrame1.dispose();
                 } });
 
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     @Test
diff --git a/src/junit/com/jogamp/test/junit/newt/TestGLWindows00NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestGLWindows00NEWT.java
index 5568f2e1a..d28dd2c11 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestGLWindows00NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestGLWindows00NEWT.java
@@ -87,8 +87,9 @@ public class TestGLWindows00NEWT extends UITestCase {
 
     static void destroyWindow(GLWindow glWindow) {
         if(null!=glWindow) {
-            glWindow.destroy(true);
+            glWindow.invalidate();
             Assert.assertEquals(false,glWindow.isNativeValid());
+            Assert.assertEquals(false,glWindow.isValid());
         }
     }
 
diff --git a/src/junit/com/jogamp/test/junit/newt/TestGLWindows01NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestGLWindows01NEWT.java
index 279f2c370..934d75f7c 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestGLWindows01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestGLWindows01NEWT.java
@@ -71,15 +71,11 @@ public class TestGLWindows01NEWT extends UITestCase {
         // 
         GLWindow glWindow;
         if(null!=screen) {
-            boolean destroyWhenUnused = screen.getDestroyWhenUnused();
-            Assert.assertEquals(destroyWhenUnused, screen.getDisplay().getDestroyWhenUnused());
             glWindow = GLWindow.create(screen, caps);
             Assert.assertNotNull(glWindow);
-            Assert.assertEquals(destroyWhenUnused, glWindow.getScreen().getDestroyWhenUnused());
         } else {
             glWindow = GLWindow.create(caps);
             Assert.assertNotNull(glWindow);
-            Assert.assertTrue(glWindow.getScreen().getDestroyWhenUnused());
         }
 
         glWindow.setUndecorated(onscreen && undecorated);
@@ -121,18 +117,11 @@ public class TestGLWindows01NEWT extends UITestCase {
         return glWindow;
     }
 
-    static void destroyWindow(GLWindow glWindow, Screen screen, Display display, boolean unrecoverable) {
+    static void destroyWindow(GLWindow glWindow) {
         if(null!=glWindow) {
-            glWindow.destroy(unrecoverable);
+            glWindow.invalidate();
             Assert.assertEquals(false,glWindow.isNativeValid());
-        }
-        if(null!=screen) {
-            screen.destroy();
-            Assert.assertEquals(false,screen.isNativeValid());
-        }
-        if(null!=display) {
-            display.destroy();
-            Assert.assertEquals(false,display.isNativeValid());
+            Assert.assertEquals(false,glWindow.isValid());
         }
     }
 
@@ -146,7 +135,7 @@ public class TestGLWindows01NEWT extends UITestCase {
 
         Assert.assertEquals(true,window.isNativeValid());
         Assert.assertEquals(true,window.isVisible());
-        window.destroy(false);
+        window.destroy();
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
@@ -162,7 +151,7 @@ public class TestGLWindows01NEWT extends UITestCase {
         Assert.assertEquals(true,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
-        destroyWindow(window, null, null, true);
+        destroyWindow(window);
     }
 
     @Test
@@ -175,7 +164,7 @@ public class TestGLWindows01NEWT extends UITestCase {
 
         Assert.assertEquals(true,window.isNativeValid());
         Assert.assertEquals(true,window.isVisible());
-        window.destroy(false);
+        window.destroy();
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
@@ -191,7 +180,7 @@ public class TestGLWindows01NEWT extends UITestCase {
         Assert.assertEquals(true,window.isNativeValid());
         Assert.assertEquals(false,window.isVisible());
 
-        destroyWindow(window, null, null, true);
+        destroyWindow(window);
     }
 
     @Test
@@ -207,7 +196,7 @@ public class TestGLWindows01NEWT extends UITestCase {
             Thread.sleep(100);
         }
         System.out.println("duration: "+window.getDuration());
-        destroyWindow(window, null, null, true);
+        destroyWindow(window);
     }
 
     @Test
@@ -223,7 +212,7 @@ public class TestGLWindows01NEWT extends UITestCase {
             Thread.sleep(100);
         }
         System.out.println("duration: "+window.getDuration());
-        destroyWindow(window, null, null, true);
+        destroyWindow(window);
     }
 
     @Test
@@ -238,8 +227,7 @@ public class TestGLWindows01NEWT extends UITestCase {
             Thread.sleep(100);
         }
         System.out.println("duration: "+window.getDuration());
-        destroyWindow(window, null, null, false);
-        destroyWindow(window, null, null, true);
+        destroyWindow(window);
     }
 
     @Test
@@ -249,7 +237,6 @@ public class TestGLWindows01NEWT extends UITestCase {
 
         Display display = NewtFactory.createDisplay(null); // local display
         Assert.assertNotNull(display);
-        display.setDestroyWhenUnused(true);
 
         Screen screen  = NewtFactory.createScreen(display, 0); // screen 0
         Assert.assertNotNull(screen);
@@ -279,8 +266,8 @@ public class TestGLWindows01NEWT extends UITestCase {
         System.out.println("duration1: "+window1.getDuration());
         System.out.println("duration2: "+window2.getDuration());
 
-        destroyWindow(window1, null, null, true);
-        destroyWindow(window2, null, null, true);
+        destroyWindow(window1);
+        destroyWindow(window2);
 
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
@@ -300,10 +287,8 @@ public class TestGLWindows01NEWT extends UITestCase {
 
         Display display1 = NewtFactory.createDisplay(null, false); // local display
         Assert.assertNotNull(display1);
-        display1.setDestroyWhenUnused(true);
         Display display2 = NewtFactory.createDisplay(null, false); // local display
         Assert.assertNotNull(display2);
-        display2.setDestroyWhenUnused(true);
         Assert.assertNotSame(display1, display2);
 
         Screen screen1  = NewtFactory.createScreen(display1, 0); // screen 0
@@ -349,8 +334,8 @@ public class TestGLWindows01NEWT extends UITestCase {
         // opening them, otherwise some driver related bug appears.
         // You may test this, ie just reverse the destroy order below.
         // See also native test: jogl/test/native/displayMultiple02.c
-        destroyWindow(window1, null, null, true);
-        destroyWindow(window2, null, null, true);
+        destroyWindow(window1);
+        destroyWindow(window2);
 
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
@@ -393,17 +378,7 @@ public class TestGLWindows01NEWT extends UITestCase {
         }
         System.out.println("durationPerTest: "+durationPerTest);
         String tstname = TestGLWindows01NEWT.class.getName();
-        org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(new String[] {
-            tstname,
-            "filtertrace=true",
-            "haltOnError=false",
-            "haltOnFailure=false",
-            "showoutput=true",
-            "outputtoformatters=true",
-            "logfailedtests=true",
-            "logtestlistenerevents=true",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.PlainJUnitResultFormatter",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter,TEST-"+tstname+".xml" } );
+        org.junit.runner.JUnitCore.main(tstname);
     }
 
 }
diff --git a/src/junit/com/jogamp/test/junit/newt/TestGLWindows02NEWTAnimated.java b/src/junit/com/jogamp/test/junit/newt/TestGLWindows02NEWTAnimated.java
index a6809e0bd..78b9773a8 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestGLWindows02NEWTAnimated.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestGLWindows02NEWTAnimated.java
@@ -114,9 +114,9 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
         return glWindow;
     }
 
-    static void destroyWindow(GLWindow glWindow, boolean deep) {
+    static void destroyWindow(GLWindow glWindow) {
         if(null!=glWindow) {
-            glWindow.destroy(deep);
+            glWindow.destroy();
         }
     }
 
@@ -130,7 +130,7 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
         while(animator.isAnimating() && animator.getDuration()<durationPerTest) {
             Thread.sleep(100);
         }
-        destroyWindow(window, true);
+        destroyWindow(window);
         Assert.assertEquals(false, animator.isAnimating());
     }
 
@@ -144,8 +144,8 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
         while(animator.isAnimating() && animator.getDuration()<durationPerTest) {
             Thread.sleep(100);
         }
-        destroyWindow(window, false);
-        destroyWindow(window, true);
+        destroyWindow(window);
+        destroyWindow(window);
         Assert.assertEquals(false, animator.isAnimating());
     }
 
@@ -175,10 +175,10 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
             Thread.sleep(100);
         }
 
-        destroyWindow(window1, true);
+        destroyWindow(window1);
         Assert.assertEquals(false, animator1.isAnimating());
 
-        destroyWindow(window2, true);
+        destroyWindow(window2);
         Assert.assertEquals(false, animator2.isAnimating());
     }
     @Test
@@ -212,10 +212,10 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
             Thread.sleep(100);
         }
 
-        destroyWindow(window1, true);
+        destroyWindow(window1);
         Assert.assertEquals(false, animator1.isAnimating());
 
-        destroyWindow(window2, true);
+        destroyWindow(window2);
         Assert.assertEquals(false, animator2.isAnimating());
     }
 
@@ -242,17 +242,7 @@ public class TestGLWindows02NEWTAnimated extends UITestCase {
             }
         }
         String tstname = TestGLWindows02NEWTAnimated.class.getName();
-        org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(new String[] {
-            tstname,
-            "filtertrace=true",
-            "haltOnError=false",
-            "haltOnFailure=false",
-            "showoutput=true",
-            "outputtoformatters=true",
-            "logfailedtests=true",
-            "logtestlistenerevents=true",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.PlainJUnitResultFormatter",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter,TEST-"+tstname+".xml" } );
+        org.junit.runner.JUnitCore.main(tstname);
     }
 
 }
diff --git a/src/junit/com/jogamp/test/junit/newt/TestListenerCom01AWT.java b/src/junit/com/jogamp/test/junit/newt/TestListenerCom01AWT.java
index 39eb47ca9..4407ffef1 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestListenerCom01AWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestListenerCom01AWT.java
@@ -119,7 +119,7 @@ public class TestListenerCom01AWT extends UITestCase {
         Assert.assertEquals(false, animator1.isAnimating());
 
         frame.dispose();
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/junit/com/jogamp/test/junit/newt/TestRemoteGLWindows01NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestRemoteGLWindows01NEWT.java
index 623651f2d..fc5327c9d 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestRemoteGLWindows01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestRemoteGLWindows01NEWT.java
@@ -88,8 +88,9 @@ public class TestRemoteGLWindows01NEWT extends UITestCase {
 
     static void destroyWindow(GLWindow glWindow) {
         if(null!=glWindow) {
-            glWindow.destroy(true);
+            glWindow.invalidate();
             Assert.assertEquals(false,glWindow.isNativeValid());
+            Assert.assertEquals(false,glWindow.isValid());
         }
     }
 
@@ -109,7 +110,6 @@ public class TestRemoteGLWindows01NEWT extends UITestCase {
 
         // Eager initialization of NEWT Display -> AbstractGraphicsDevice -> GLProfile (device)
         Display display2 = NewtFactory.createDisplay("charelle:0.0"); // remote display
-        display2.setDestroyWhenUnused(true);
         try {
             display2.createNative(); 
         } catch (NativeWindowException nwe) {
diff --git a/src/junit/com/jogamp/test/junit/newt/TestScreenMode00NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestScreenMode00NEWT.java
index 06911e82b..9f39274c5 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestScreenMode00NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestScreenMode00NEWT.java
@@ -120,9 +120,12 @@ public class TestScreenMode00NEWT extends UITestCase {
             Assert.assertNotNull(sm_c);
             System.err.println("orig: "+sm_o);
             System.err.println("curr: "+sm_c);
+        } else {
+            // no support ..
+            System.err.println("Your platform has no ScreenMode change support, sorry");
         }
 
-        window.destroy(true);
+        window.invalidate();
 
         Assert.assertEquals(false,window.isVisible());
         Assert.assertEquals(false,window.isNativeValid());
diff --git a/src/junit/com/jogamp/test/junit/newt/TestScreenMode01NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestScreenMode01NEWT.java
index fe17857ef..de4def2fa 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestScreenMode01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestScreenMode01NEWT.java
@@ -72,26 +72,18 @@ public class TestScreenMode01NEWT extends UITestCase {
         Assert.assertNotNull(caps);
         caps.setOnscreen(onscreen);
 
-        boolean destroyWhenUnused = screen.getDestroyWhenUnused();
         GLWindow window = GLWindow.create(screen, caps);
         window.setSize(width, height);
         window.addGLEventListener(new Gears());
         Assert.assertNotNull(window);
-        Assert.assertEquals(destroyWhenUnused, window.getScreen().getDestroyWhenUnused());
         window.setVisible(true);
         return window;
     }
 
-    static void destroyWindow(Display display, Screen screen, Window window) {
+    static void destroyWindow(Window window) {
         if(null!=window) {
             window.destroy();
         }
-        if(null!=screen) {
-            screen.destroy();
-        }
-        if(null!=display) {
-            display.destroy();
-        }
     }
     
     @Test
@@ -118,7 +110,7 @@ public class TestScreenMode01NEWT extends UITestCase {
         Thread.sleep(waitTimeShort);
 
         animator.stop();
-        destroyWindow(display, screen, window);    	
+        destroyWindow(window);    	
     }
 
     @Test
@@ -137,7 +129,8 @@ public class TestScreenMode01NEWT extends UITestCase {
         List screenModes = screen.getScreenModes();
         if(null==screenModes) {
             // no support ..
-            destroyWindow(display, screen, window);
+            System.err.println("Your platform has no ScreenMode change support, sorry");
+            destroyWindow(window);
             return;
         }
         Assert.assertTrue(screenModes.size()>0);
@@ -183,15 +176,14 @@ public class TestScreenMode01NEWT extends UITestCase {
         Assert.assertEquals(true,window.isVisible());
 
         animator.stop();
-        destroyWindow(null, screen, window);
+        destroyWindow(window);
 
         Assert.assertEquals(false,window.isVisible());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,screen.isNativeValid());
-        Assert.assertEquals(true,display.isNativeValid());
+        Assert.assertEquals(false,display.isNativeValid());
 
-        screen  = NewtFactory.createScreen(display, 0); // screen 0
-        screen.addReference(); // trigger native creation
+        screen.createNative(); // trigger native re-creation
 
         Assert.assertEquals(true,display.isNativeValid());
         Assert.assertEquals(true,screen.isNativeValid());
@@ -202,7 +194,7 @@ public class TestScreenMode01NEWT extends UITestCase {
         Assert.assertNotNull(smCurrent);
         Assert.assertEquals(saveOrigMode, smOrig);
 
-        destroyWindow(display, screen, null);
+        screen.destroy();
 
         Assert.assertEquals(false,screen.isNativeValid());
         Assert.assertEquals(false,display.isNativeValid());
@@ -236,7 +228,7 @@ public class TestScreenMode01NEWT extends UITestCase {
         List screenModes = screen.getScreenModes();
         if(null==screenModes) {
             // no support ..
-            destroyWindow(display, screen, window);
+            destroyWindow(window);
             return;
         }
         Assert.assertTrue(screenModes.size()>0);
@@ -272,10 +264,9 @@ public class TestScreenMode01NEWT extends UITestCase {
         ScreenMode saveOrigMode = (ScreenMode) smOrig.clone();
 
         animator.stop();
-        destroyWindow(null, screen, window);
+        destroyWindow(window);
 
-        screen  = NewtFactory.createScreen(display, 0); // screen 0
-        screen.addReference(); // trigger native creation
+        screen.createNative(); // trigger native re-creation
 
         ScreenMode smCurrent = screen.getCurrentScreenMode();
         System.err.println("[1] current/orig: "+smCurrent);
@@ -283,7 +274,7 @@ public class TestScreenMode01NEWT extends UITestCase {
         Assert.assertNotNull(smCurrent);
         Assert.assertEquals(saveOrigMode, smOrig);
 
-        destroyWindow(display, screen, null);
+        screen.destroy();
     }
 
     public static void main(String args[]) throws IOException {
diff --git a/src/junit/com/jogamp/test/junit/newt/TestScreenMode02NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestScreenMode02NEWT.java
index 98c8fd58c..011af6330 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestScreenMode02NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestScreenMode02NEWT.java
@@ -70,26 +70,19 @@ public class TestScreenMode02NEWT extends UITestCase {
         Assert.assertNotNull(caps);
         caps.setOnscreen(onscreen);
 
-        boolean destroyWhenUnused = screen.getDestroyWhenUnused();
         GLWindow window = GLWindow.create(screen, caps);
         window.setSize(width, height);
         window.addGLEventListener(new Gears());
         Assert.assertNotNull(window);
-        Assert.assertEquals(destroyWhenUnused, window.getScreen().getDestroyWhenUnused());
         window.setVisible(true);
+        Assert.assertTrue(window.isVisible());
         return window;
     }
 
-    static void destroyWindow(Display display, Screen screen, Window window) {
+    static void destroyWindow(Window window) {
         if(null!=window) {
             window.destroy();
         }
-        if(null!=screen) {
-            screen.destroy();
-        }
-        if(null!=display) {
-            display.destroy();
-        }
     }
     
     @Test
@@ -108,7 +101,8 @@ public class TestScreenMode02NEWT extends UITestCase {
         List screenModes = screen.getScreenModes();
         if(null==screenModes) {
             // no support ..
-            destroyWindow(display, screen, window);
+            System.err.println("Your platform has no ScreenMode change support, sorry");
+            destroyWindow(window);
             return;
         }
         Assert.assertTrue(screenModes.size()>0);
@@ -129,7 +123,8 @@ public class TestScreenMode02NEWT extends UITestCase {
         screenModes = ScreenModeUtil.filterByRotation(screenModes, 90);
         if(null==screenModes) {
             // no rotation support ..
-            destroyWindow(display, screen, window);
+            System.err.println("Your platform has no rotation support, sorry");
+            destroyWindow(window);
             return;
         }
         Assert.assertTrue(screenModes.size()>0);
@@ -158,15 +153,14 @@ public class TestScreenMode02NEWT extends UITestCase {
         Assert.assertEquals(true,window.isVisible());
 
         animator.stop();
-        destroyWindow(null, screen, window);
+        destroyWindow(window);
 
         Assert.assertEquals(false,window.isVisible());
         Assert.assertEquals(false,window.isNativeValid());
         Assert.assertEquals(false,screen.isNativeValid());
-        Assert.assertEquals(true,display.isNativeValid());
+        Assert.assertEquals(false,display.isNativeValid());
 
-        screen  = NewtFactory.createScreen(display, 0); // screen 0
-        screen.addReference(); // trigger native creation
+        screen.createNative(); // trigger native re-creation
 
         Assert.assertEquals(true,display.isNativeValid());
         Assert.assertEquals(true,screen.isNativeValid());
@@ -177,7 +171,7 @@ public class TestScreenMode02NEWT extends UITestCase {
         Assert.assertNotNull(smCurrent);
         Assert.assertEquals(saveOrigMode, smOrig);
 
-        destroyWindow(display, screen, null);
+        screen.destroy();
 
         Assert.assertEquals(false,screen.isNativeValid());
         Assert.assertEquals(false,display.isNativeValid());
diff --git a/src/junit/com/jogamp/test/junit/newt/TestWindows01NEWT.java b/src/junit/com/jogamp/test/junit/newt/TestWindows01NEWT.java
index 88edd89ba..706ad5192 100644
--- a/src/junit/com/jogamp/test/junit/newt/TestWindows01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/TestWindows01NEWT.java
@@ -173,17 +173,7 @@ public class TestWindows01NEWT extends UITestCase {
 
     public static void main(String args[]) throws IOException {
         String tstname = TestWindows01NEWT.class.getName();
-        org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(new String[] {
-            tstname,
-            "filtertrace=true",
-            "haltOnError=false",
-            "haltOnFailure=false",
-            "showoutput=true",
-            "outputtoformatters=true",
-            "logfailedtests=true",
-            "logtestlistenerevents=true",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.PlainJUnitResultFormatter",
-            "formatter=org.apache.tools.ant.taskdefs.optional.junit.XMLJUnitResultFormatter,TEST-"+tstname+".xml" } );
+        org.junit.runner.JUnitCore.main(tstname);
     }
 
 }
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01NEWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01NEWT.java
index b9182dbaa..1f45c6c1d 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01NEWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01NEWT.java
@@ -78,7 +78,6 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertNull(glWindow1.getParent());
         screen = glWindow1.getScreen();
         display = screen.getDisplay();
-        Assert.assertEquals(true,display.getDestroyWhenUnused());
         Assert.assertEquals(0,display.getReferenceCount());
         Assert.assertEquals(false,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
@@ -105,7 +104,6 @@ public class TestParenting01NEWT extends UITestCase {
         setDemoFields(demo2, glWindow2, false);
         glWindow2.addGLEventListener(demo2);
 
-        Assert.assertEquals(true,display.getDestroyWhenUnused());
         Assert.assertEquals(0,display.getReferenceCount());
         Assert.assertEquals(false,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
@@ -226,7 +224,7 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(true,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
         Assert.assertEquals(true,display.getEDTUtil().isRunning());
-        Assert.assertEquals(2,screen.getReferenceCount());
+        Assert.assertEquals(1,screen.getReferenceCount());
         Assert.assertEquals(true,screen.isNativeValid());
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
 
@@ -238,13 +236,13 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(false, glWindow2.isNativeValid());
         Assert.assertEquals(true,  glWindow2.isValid());
 
-        Assert.assertEquals(1,display.getReferenceCount());
-        Assert.assertEquals(true,display.isNativeValid());
+        Assert.assertEquals(0,display.getReferenceCount());
+        Assert.assertEquals(false,display.isNativeValid());
         Assert.assertNotNull(display.getEDTUtil());
-        Assert.assertEquals(true,display.getEDTUtil().isRunning());
-        Assert.assertEquals(2,screen.getReferenceCount());
-        Assert.assertEquals(true,screen.isNativeValid());
-        Assert.assertEquals(1,Display.getActiveDisplayNumber());
+        Assert.assertEquals(false,display.getEDTUtil().isRunning());
+        Assert.assertEquals(0,screen.getReferenceCount());
+        Assert.assertEquals(false,screen.isNativeValid());
+        Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
         // recreation ..
         glWindow1.resetCounter();
@@ -269,11 +267,11 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(true,screen.isNativeValid());
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
 
-        // cannot be recreated, will drop Display/Screen refs
-        glWindow1.destroy(true); 
-        Assert.assertEquals(false, glWindow1.isValid());
+        // chain glwindow1 -> glwindow2 ; can be recreated ..
+        glWindow1.destroy();
+        Assert.assertEquals(true, glWindow1.isValid());
         Assert.assertEquals(false, glWindow1.isNativeValid());
-        Assert.assertEquals(false, glWindow2.isValid());
+        Assert.assertEquals(true, glWindow2.isValid());
         Assert.assertEquals(false, glWindow2.isNativeValid());
         Assert.assertEquals(0,display.getReferenceCount());
         Assert.assertEquals(false,display.isNativeValid());
@@ -283,9 +281,13 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(false,screen.isNativeValid());
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
-        // test double destroy ..
-        glWindow2.destroy(true);
-        Assert.assertEquals(false,  glWindow2.isValid());
+        glWindow1.invalidate();
+        Assert.assertEquals(false, glWindow1.isValid());
+        Assert.assertEquals(false, glWindow2.isValid());
+
+        // test double destroy/invalidate ..
+        glWindow2.invalidate();
+        Assert.assertEquals(false, glWindow2.isValid());
 
         Assert.assertEquals(0,display.getReferenceCount());
         Assert.assertEquals(false,display.isNativeValid());
@@ -328,7 +330,6 @@ public class TestParenting01NEWT extends UITestCase {
         screen1 = glWindow1.getScreen();
         display1 = screen1.getDisplay();
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(0,display1.getReferenceCount());
         Assert.assertEquals(false,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -345,7 +346,6 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertSame(screen1, glWindow2.getScreen());
         Assert.assertSame(display1, glWindow2.getScreen().getDisplay());
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(0,display1.getReferenceCount());
         Assert.assertEquals(false,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -442,6 +442,10 @@ public class TestParenting01NEWT extends UITestCase {
             }
             state++;
         }
+        //
+        // both windows are now top level
+        //
+
         animator1.stop();
         Assert.assertEquals(false, animator1.isAnimating());
         Assert.assertEquals(false, animator1.isPaused());
@@ -461,9 +465,13 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
 
         // destroy glWindow2
-        glWindow2.destroy(true);
+        glWindow2.destroy();
         Assert.assertEquals(true,  glWindow1.isValid());
-        Assert.assertEquals(false, glWindow2.isValid());
+        Assert.assertEquals(true,  glWindow1.isNativeValid());
+        Assert.assertEquals(true,  glWindow1.isVisible());
+        Assert.assertEquals(true,  glWindow2.isValid());
+        Assert.assertEquals(false, glWindow2.isNativeValid());
+        Assert.assertEquals(false, glWindow2.isVisible());
 
         Assert.assertEquals(1,display1.getReferenceCount());
         Assert.assertEquals(true,display1.isNativeValid());
@@ -475,9 +483,13 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
 
         // destroy glWindow1
-        glWindow1.destroy(true);
-        Assert.assertEquals(false, glWindow1.isValid());
-        Assert.assertEquals(false, glWindow2.isValid());
+        glWindow1.destroy();
+        Assert.assertEquals(true,  glWindow1.isValid());
+        Assert.assertEquals(false, glWindow1.isNativeValid());
+        Assert.assertEquals(false, glWindow1.isVisible());
+        Assert.assertEquals(true,  glWindow2.isValid());
+        Assert.assertEquals(false, glWindow2.isNativeValid());
+        Assert.assertEquals(false, glWindow2.isVisible());
 
         Assert.assertEquals(0,display1.getReferenceCount());
         Assert.assertEquals(false,display1.isNativeValid());
@@ -487,6 +499,13 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(false,screen1.isNativeValid());
 
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
+
+        glWindow1.invalidate();
+        Assert.assertEquals(false, glWindow1.isValid());
+        Assert.assertEquals(true,  glWindow2.isValid());
+
+        glWindow2.invalidate();
+        Assert.assertEquals(false, glWindow2.isValid());
     }
 
     @Test
@@ -520,7 +539,6 @@ public class TestParenting01NEWT extends UITestCase {
         setDemoFields(demo1, glWindow1, false);
         glWindow1.addGLEventListener(demo1);
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(0,display1.getReferenceCount());
         Assert.assertEquals(false,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -537,7 +555,6 @@ public class TestParenting01NEWT extends UITestCase {
         setDemoFields(demo2, glWindow2, false);
         glWindow2.addGLEventListener(demo2);
 
-        Assert.assertEquals(true,display2.getDestroyWhenUnused());
         Assert.assertEquals(0,display2.getReferenceCount());
         Assert.assertEquals(false,display2.isNativeValid());
         Assert.assertNotNull(display2.getEDTUtil());
@@ -556,7 +573,6 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertTrue(0 < glWindow2.getTotalFrames());
         Assert.assertTrue(0 < glWindow1.getTotalFrames());
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(1,display1.getReferenceCount());
         Assert.assertEquals(true,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -606,6 +622,10 @@ public class TestParenting01NEWT extends UITestCase {
             }
             state++;
         }
+        //
+        // glwindow2 is child of glwindow1
+        //
+
         animator1.stop();
         Assert.assertEquals(false, animator1.isAnimating());
         Assert.assertEquals(false, animator1.isPaused());
@@ -615,7 +635,6 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(false, animator2.isPaused());
         Assert.assertEquals(null, animator2.getThread());
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(1,display1.getReferenceCount());
         Assert.assertEquals(true,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -627,11 +646,14 @@ public class TestParenting01NEWT extends UITestCase {
 
         Assert.assertEquals(1,Display.getActiveDisplayNumber());
 
-        glWindow1.destroy(true); // should destroy both windows, actually, since glWindow2 is a child
-        Assert.assertEquals(false, glWindow1.isValid());
-        Assert.assertEquals(false, glWindow2.isValid());
+        glWindow1.destroy(); // should destroy both windows, actually, since glWindow2 is a child
+        Assert.assertEquals(true,  glWindow1.isValid());
+        Assert.assertEquals(false, glWindow1.isNativeValid());
+        Assert.assertEquals(false, glWindow1.isVisible());
+        Assert.assertEquals(true,  glWindow2.isValid());
+        Assert.assertEquals(false, glWindow2.isNativeValid());
+        Assert.assertEquals(false, glWindow2.isVisible());
 
-        Assert.assertEquals(true,display1.getDestroyWhenUnused());
         Assert.assertEquals(0,display1.getReferenceCount());
         Assert.assertEquals(false,display1.isNativeValid());
         Assert.assertNotNull(display1.getEDTUtil());
@@ -639,7 +661,6 @@ public class TestParenting01NEWT extends UITestCase {
         Assert.assertEquals(0,screen1.getReferenceCount());
         Assert.assertEquals(false,screen1.isNativeValid());
 
-        Assert.assertEquals(true,display2.getDestroyWhenUnused());
         Assert.assertEquals(0,display2.getReferenceCount());
         Assert.assertEquals(false,display2.isNativeValid());
         Assert.assertNotNull(display2.getEDTUtil());
@@ -649,7 +670,11 @@ public class TestParenting01NEWT extends UITestCase {
 
         Assert.assertEquals(0,Display.getActiveDisplayNumber());
 
-        glWindow2.destroy(true);
+        glWindow2.destroy(); // dbl destroy check ..
+        Assert.assertEquals(false, glWindow1.isNativeValid());
+        Assert.assertEquals(false, glWindow2.isNativeValid());
+
+        glWindow1.invalidate(); // parent -> child
         Assert.assertEquals(false, glWindow1.isValid());
         Assert.assertEquals(false, glWindow2.isValid());
 
@@ -698,3 +723,4 @@ public class TestParenting01NEWT extends UITestCase {
     }
 
 }
+
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01aAWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01aAWT.java
index 931cf2d5f..2c3455cb0 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01aAWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01aAWT.java
@@ -143,7 +143,7 @@ public class TestParenting01aAWT extends UITestCase {
         frame1.dispose();
         Assert.assertEquals(true, glWindow1.isValid());
 
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
         //Assert.assertEquals(false, glWindow1.isValid());
     }
 
@@ -188,7 +188,7 @@ public class TestParenting01aAWT extends UITestCase {
         Assert.assertEquals(false, animator1.isAnimating());
 
         frame.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     @Test
@@ -223,7 +223,7 @@ public class TestParenting01aAWT extends UITestCase {
         Assert.assertEquals(true, animator1.isAnimating()); // !!!
 
         frame.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     @Test
@@ -273,7 +273,7 @@ public class TestParenting01aAWT extends UITestCase {
         Assert.assertEquals(false, animator1.isAnimating());
 
         frame.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     @Test
@@ -328,7 +328,7 @@ public class TestParenting01aAWT extends UITestCase {
         Assert.assertEquals(false, animator1.isAnimating());
 
         frame.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     @Test
@@ -393,7 +393,7 @@ public class TestParenting01aAWT extends UITestCase {
 
         frame1.dispose();
         frame2.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01bAWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01bAWT.java
index 9eecf31a1..89cefa8b1 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01bAWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01bAWT.java
@@ -156,7 +156,7 @@ public class TestParenting01bAWT extends UITestCase {
 
         frame1.dispose();
         frame2.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cAWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cAWT.java
index 2dcc7af9b..b79f4c57c 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cAWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cAWT.java
@@ -137,7 +137,7 @@ public class TestParenting01cAWT extends UITestCase {
         frame1.dispose();
         Assert.assertEquals(true, glWindow1.isValid());
 
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
         //Assert.assertEquals(false, glWindow1.isValid());
     }
 
@@ -196,7 +196,7 @@ public class TestParenting01cAWT extends UITestCase {
 
         frame1.dispose();
         frame2.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cSwingAWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cSwingAWT.java
index 3fc39a3f1..ec54a0f9e 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cSwingAWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting01cSwingAWT.java
@@ -189,7 +189,7 @@ public class TestParenting01cSwingAWT extends UITestCase {
                 } });
         Assert.assertEquals(true, glWindow1.isValid());
 
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
         //Assert.assertEquals(false, glWindow1.isValid());
     }
 
@@ -324,7 +324,7 @@ public class TestParenting01cSwingAWT extends UITestCase {
                 } });
         Assert.assertEquals(true, glWindow1.isValid());
 
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
         //Assert.assertEquals(false, glWindow1.isValid());
     }
 
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting02AWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting02AWT.java
index 3311bc691..6c9e5b2b2 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting02AWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting02AWT.java
@@ -213,7 +213,7 @@ public class TestParenting02AWT extends UITestCase {
         }
         Thread.sleep(waitReparent);
 
-        glWindow.destroy(true);
+        glWindow.invalidate();
         if(useLayout) {
             frame.remove(newtCanvasAWT);
         }
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03AWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03AWT.java
index 5fa7dee41..61086099c 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03AWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03AWT.java
@@ -152,7 +152,7 @@ public class TestParenting03AWT extends UITestCase {
         Assert.assertEquals(null, animator1.getThread());
 
         frame1.dispose();
-        glWindow1.destroy(true);
+        glWindow1.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03bAWT.java b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03bAWT.java
index b4ced6973..a31e49b45 100644
--- a/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03bAWT.java
+++ b/src/junit/com/jogamp/test/junit/newt/parenting/TestParenting03bAWT.java
@@ -206,8 +206,8 @@ public class TestParenting03bAWT extends UITestCase {
         Assert.assertEquals(null, animator2.getThread());
 
         frame1.dispose();
-        glWindow1.destroy(true);
-        glWindow2.destroy(true);
+        glWindow1.invalidate();
+        glWindow2.invalidate();
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
diff --git a/src/newt/classes/com/jogamp/newt/Display.java b/src/newt/classes/com/jogamp/newt/Display.java
index 19733723e..3e5c0c25e 100644
--- a/src/newt/classes/com/jogamp/newt/Display.java
+++ b/src/newt/classes/com/jogamp/newt/Display.java
@@ -54,43 +54,39 @@ public abstract class Display {
     }
 
     /**
-     * Manual trigger the native creation.<br>
+     * Manual trigger the native creation, if it is not done yet.<br>
      * This is useful to be able to request the {@link javax.media.nativewindow.AbstractGraphicsDevice}, via
-     * {@link #getGraphicsDevice()}. Otherwise the abstract device won't be available before the dependent components (Screen and Window)
-     * are realized.
+     * {@link #getGraphicsDevice()}.<br>
+     * Otherwise the abstract device won't be available before the dependent components (Screen and Window) are realized.
+     * <p>
+     * This method is usually invoke by {@link #addReference()}
+     * </p>
      * @throws NativeWindowException if the native creation failed.
      */
     public abstract void createNative() throws NativeWindowException;
 
-    public abstract void destroy();
-
     /**
-     * @return true if the native display handle is valid and ready to operate,
-     * otherwise false.
-     *
-     * @see #destroy()
+     * Manually trigger the destruction, incl. native destruction.<br>
+     * <p>
+     * This method is usually invoke by {@link #removeReference()}
+     * </p>
      */
-    public abstract boolean isNativeValid();
+    public abstract void destroy();
 
     /**
-     * @return the value set by {@link #setDestroyWhenUnused(boolean)}
-     * or the default <code>false</code>.
-     *
-     * @see #addReference()
-     * @see #removeReference()
+     * Validate EDT running state.<br>
+     * Stop the running EDT in case this display is destroyed already.<br>
+     * @return true if EDT has been stopped (destroyed but running), otherwise false.
      */
-    public abstract boolean getDestroyWhenUnused();
+    public abstract boolean validateEDT();
 
     /**
-     * Handles the lifecycle of the native Display instance.<br>
-     * If set to <code>true</code>, the last {@link #removeReference()} call
-     * will destroy this instance, otherwise it will stay alive.<br>
-     * Default is <code>false</code>.
+     * @return true if the native display handle is valid and ready to operate,
+     * otherwise false.
      *
-     * @see #addReference()
-     * @see #removeReference()
+     * @see #destroy()
      */
-    public abstract void setDestroyWhenUnused(boolean v);
+    public abstract boolean isNativeValid();
 
     /**
      * @return number of references by Screen
diff --git a/src/newt/classes/com/jogamp/newt/NewtFactory.java b/src/newt/classes/com/jogamp/newt/NewtFactory.java
index e1b15da69..892a2426e 100644
--- a/src/newt/classes/com/jogamp/newt/NewtFactory.java
+++ b/src/newt/classes/com/jogamp/newt/NewtFactory.java
@@ -162,7 +162,6 @@ public class NewtFactory {
                 Display display = NewtFactory.createDisplay(type, null, true); // local display
                 screen  = NewtFactory.createScreen(display, 0); // screen 0
             }
-            screen.setDestroyWhenUnused(true);
         }
         final Window win = createWindowImpl(nParentWindow, screen, caps);
 
@@ -189,7 +188,6 @@ public class NewtFactory {
     protected static Window createWindowImpl(String type, Capabilities caps) {
         Display display = NewtFactory.createDisplay(type, null, true); // local display
         Screen screen  = NewtFactory.createScreen(display, 0); // screen 0
-        screen.setDestroyWhenUnused(true);
         return WindowImpl.create(null, 0, screen, caps);
     }
 
diff --git a/src/newt/classes/com/jogamp/newt/Screen.java b/src/newt/classes/com/jogamp/newt/Screen.java
index a6d45d789..bf8c6f0eb 100644
--- a/src/newt/classes/com/jogamp/newt/Screen.java
+++ b/src/newt/classes/com/jogamp/newt/Screen.java
@@ -59,38 +59,36 @@ public abstract class Screen {
     }
 
     /**
-     * Manual trigger the native creation.<br>
+     * Manual trigger the native creation, if it is not done yet..<br>
      * This is useful to be able to request the {@link javax.media.nativewindow.AbstractGraphicsScreen}, via
-     * {@link #getGraphicsScreen()}. Otherwise the abstract device won't be available before the dependent component (Window)
-     * is realized.
+     * {@link #getGraphicsScreen()}.<br>
+     * Otherwise the abstract device won't be available before the dependent component (Window) is realized.
+     * <p>
+     * This method is usually invoke by {@link #addReference()}
+     * </p>
+     * <p>
+     * This method invokes {@link Display#addReference()} after creating the native peer,<br>
+     * which will issue {@link Display#createNative()} if the reference count was 0.
+     * </p>
      * @throws NativeWindowException if the native creation failed.
      */
     public abstract void createNative() throws NativeWindowException;
 
-    public abstract void destroy();
-
-    public abstract boolean isNativeValid();
-
     /**
-     * @return {@link Display#getDestroyWhenUnused()}
-     *
-     * @see #addReference()
-     * @see #removeReference()
-     * @see Display#setDestroyWhenUnused(boolean)
+     * Manually trigger the destruction, incl. native destruction.<br>
+     * <p>
+     * This method is usually invoke by {@link #removeReference()}
+     * </p>
+     * <p>
+     * This method invokes {@link Display#removeReference()} after it's own destruction,<br>
+     * which will issue {@link Display#destroy()} if the reference count becomes 0.
+     * </p>
      */
-    public abstract boolean getDestroyWhenUnused();
+    public abstract void destroy();
 
-    /**
-     * calls {@link Display#setDestroyWhenUnused(boolean)}.
-     *
-     * @see #addReference()
-     * @see #removeReference()
-     * @see Display#setDestroyWhenUnused(boolean)
-     */
-    public abstract void setDestroyWhenUnused(boolean v);
+    public abstract boolean isNativeValid();
 
     /**
-     *
      * @return number of references by Window
      */
     public abstract int getReferenceCount();
diff --git a/src/newt/classes/com/jogamp/newt/Window.java b/src/newt/classes/com/jogamp/newt/Window.java
index ba7d51e67..9307ea7f7 100644
--- a/src/newt/classes/com/jogamp/newt/Window.java
+++ b/src/newt/classes/com/jogamp/newt/Window.java
@@ -87,30 +87,24 @@ public interface Window extends NativeWindow, ScreenModeListener {
     Capabilities getChosenCapabilities();
 
     /**
-     *
-     * <p>
-     * destroys the window and children and releases
-     * windowing related resources.<br></p>
+     * Destroy the Window and it's children, incl. native destruction.<br>
+     * The Window can be recreate via {@link #setVisible(boolean) setVisible(true)}.
      * <p>
-     * all other resources and states are kept intact,
-     * ie listeners, parent handles, size, position and Screen reference.<br></p>
-     *
-     * @see #destroy(boolean)
+     * This method invokes {@link Screen#removeReference()} after it's own destruction,<br>
+     * which will issue {@link Screen#destroy()} if the reference count becomes 0.<br>
+     * This destruction sequence shall end up in {@link Display#destroy()}, if all reference counts become 0.
+     * </p>
      * @see #invalidate()
+     * @see #setVisible(boolean)
      */
     void destroy();
 
     /**
-     *
-     * Destroys the Window and it's children.
-     * @param unrecoverable If true, all resources, ie listeners, parent handles,
-     * size, position and reference to it's Screen will be destroyed as well.
-     * Otherwise you can recreate the window, via <code>setVisible(true)</code>.
-     * @see #destroy()
-     * @see #invalidate(boolean)
-     * @see #setVisible(boolean)
+     * Destroys the Window via {@link #destroy()} and clears all Object references,
+     * eg. all states, size, position, parent handles, list of child Windows and reference to it's Screen.<br>
+     * This Window cannot be recreated after calling this method anymore.<br>
      */
-    void destroy(boolean unrecoverable);
+    void invalidate();
 
     /**
      * <p>
diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 3ba721855..a0ab5f9f6 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -193,37 +193,27 @@ public class NewtCanvasAWT extends java.awt.Canvas {
     }
 
     /**
-     * @see #destroy(boolean)
-     */
-    public final void destroy() {
-        destroy(false);
-    }
-
-    /**
      * Destroys this resource:
      * <ul>
      *   <li> Make the NEWT Child invisible </li>
      *   <li> Disconnects the NEWT Child from this Canvas NativeWindow, reparent to NULL </li>
-     *   <li> Issues <code>destroy(unrecoverable)</code> on the NEWT Child</li>
-     *   <li> Remove reference to the NEWT Child, if unrecoverable</li>
+     *   <li> Issues <code>destroy()</code> on the NEWT Child</li>
+     *   <li> Remove reference to the NEWT Child</li>
      *   <li> Remove this Canvas from it's parent.</li>
      * </ul>
      * @see Window#destroy()
-     * @see Window#destroy(boolean)
      */
-    public final void destroy(boolean unrecoverable) {
+    public final void destroy() {
         if(null!=newtChild) {
             java.awt.Container cont = getContainer(this);
             if(DEBUG) {
-                System.err.println("NewtCanvasAWT.destroy("+unrecoverable+"): "+newtChild+", from "+cont);
+                System.err.println("NewtCanvasAWT.destroy(): "+newtChild+", from "+cont);
             }
             nativeWindow = null;
             newtChild.setVisible(false);
             newtChild.reparentWindow(null);
-            newtChild.destroy(unrecoverable);
-            if(unrecoverable) {
-                newtChild = null;
-            }
+            newtChild.destroy();
+            newtChild=null;
             if(null!=cont) {
                 cont.remove(this);
             }
diff --git a/src/newt/classes/com/jogamp/newt/impl/DefaultEDTUtil.java b/src/newt/classes/com/jogamp/newt/impl/DefaultEDTUtil.java
index e2b3b81ef..7a2a0c9bd 100644
--- a/src/newt/classes/com/jogamp/newt/impl/DefaultEDTUtil.java
+++ b/src/newt/classes/com/jogamp/newt/impl/DefaultEDTUtil.java
@@ -57,6 +57,7 @@ public class DefaultEDTUtil implements EDTUtil {
         this.name=new String(Thread.currentThread().getName()+"-"+name+"-EDT-");
         this.dispatchMessages=dispatchMessages;
         this.edt = new EventDispatchThread(threadGroup, name);
+        this.edt.setDaemon(true); // don't stop JVM from shutdown ..
     }
 
     public final void reset() {
@@ -72,6 +73,7 @@ public class DefaultEDTUtil implements EDTUtil {
                 System.err.println(Thread.currentThread()+": EDT reset - edt: "+edt);
             }
             this.edt = new EventDispatchThread(threadGroup, name);
+            this.edt.setDaemon(true); // don't stop JVM from shutdown ..
         }
     }
 
diff --git a/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java b/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
index 7983a1118..2af01c217 100644
--- a/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/DisplayImpl.java
@@ -181,13 +181,29 @@ public abstract class DisplayImpl extends Display {
         }
     }
 
+    public boolean validateEDT() {
+        if(0==refCount && null==aDevice && null != edtUtil && edtUtil.isRunning()) {
+            stopEDT( new Runnable() {
+                public void run() {
+                    // nop
+                }
+            } );
+            edtUtil.waitUntilStopped();
+            edtUtil.reset();
+            return true;
+        }
+        return false;
+    }
+
     public synchronized final void destroy() {
         if(DEBUG) {
             dumpDisplayList("Display.destroy("+getFQName()+") BEGIN");
         }
         synchronized(displayList) {
             displayList.remove(this);
-            displaysActive--;
+            if(0 < displaysActive) {
+                displaysActive--;
+            }
         }
         if(DEBUG) {
             System.err.println("Display.destroy(): "+this+" "+getThreadName());
@@ -225,7 +241,7 @@ public abstract class DisplayImpl extends Display {
         if(null == aDevice) {
             throw new NativeWindowException ("Display.addReference() (refCount "+refCount+") null AbstractGraphicsDevice");
         }
-        return ++refCount;
+        return refCount++;
     }
 
 
@@ -233,9 +249,10 @@ public abstract class DisplayImpl extends Display {
         if(DEBUG) {
             System.err.println("Display.removeReference() ("+DisplayImpl.getThreadName()+"): "+refCount+" -> "+(refCount-1));
         }
-        refCount--; // could become < 0, in case of forced destruction without actual creation/addReference
-        if(0>=refCount && getDestroyWhenUnused()) {
+        refCount--; // could become < 0, in case of manual destruction without actual creation/addReference
+        if(0>=refCount) {
             destroy();
+            refCount=0; // fix < 0
         }
         return refCount;
     }
@@ -244,9 +261,6 @@ public abstract class DisplayImpl extends Display {
         return refCount;
     }
 
-    public final boolean getDestroyWhenUnused() { return destroyWhenUnused; }
-    public final void setDestroyWhenUnused(boolean v) { destroyWhenUnused=v; }
-
     protected abstract void createNativeImpl();
     protected abstract void closeNativeImpl();
 
@@ -275,7 +289,7 @@ public abstract class DisplayImpl extends Display {
         return ( null == name ) ? nilString : name ;
     }
 
-    protected static final String getFQName(String type, String name, int id) {
+    private static final String getFQName(String type, String name, int id) {
         if(null==type) type=nilString;
         if(null==name) name=nilString;
         StringBuffer sb = new StringBuffer();
@@ -284,7 +298,7 @@ public abstract class DisplayImpl extends Display {
         sb.append(name);
         sb.append("-");
         sb.append(id);
-        return sb.toString();
+        return sb.toString().intern();
     }
 
     public final long getHandle() {
diff --git a/src/newt/classes/com/jogamp/newt/impl/OffscreenWindow.java b/src/newt/classes/com/jogamp/newt/impl/OffscreenWindow.java
index f3c7b8415..30dc945db 100644
--- a/src/newt/classes/com/jogamp/newt/impl/OffscreenWindow.java
+++ b/src/newt/classes/com/jogamp/newt/impl/OffscreenWindow.java
@@ -68,13 +68,13 @@ public class OffscreenWindow extends WindowImpl implements SurfaceChangeable {
         // nop
     }
 
-    public void invalidate(boolean unrecoverable) {
+    protected void invalidate(boolean unrecoverable) {
         super.invalidate(unrecoverable);
         surfaceHandle = 0;
     }
 
-    public synchronized void destroy(boolean unrecoverable) {
-        super.destroy(unrecoverable);
+    public synchronized void destroy() {
+        super.destroy();
         surfaceHandle = 0;
     }
 
diff --git a/src/newt/classes/com/jogamp/newt/impl/ScreenImpl.java b/src/newt/classes/com/jogamp/newt/impl/ScreenImpl.java
index c9d1a9c32..071122a68 100644
--- a/src/newt/classes/com/jogamp/newt/impl/ScreenImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/ScreenImpl.java
@@ -50,7 +50,8 @@ import java.util.ArrayList;
 import java.util.List;
 
 public abstract class ScreenImpl extends Screen implements ScreenModeListener {
-    protected static final boolean DisableScreenModeImpl = Debug.debug("Screen.DisableScreenModeImpl");
+    protected static final boolean DEBUG_TEST_SCREENMODE_DISABLED = Debug.isPropertyDefined("newt.test.Screen.disableScreenMode", true);
+
     protected DisplayImpl display;
     protected int screen_idx;
     protected String fqname;
@@ -112,7 +113,7 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
                 ScreenImpl screen  = (ScreenImpl) screenClass.newInstance();
                 screen.display = (DisplayImpl) display;
                 screen.screen_idx = idx;
-                screen.fqname = display.getFQName()+idx;
+                screen.fqname = (display.getFQName()+idx).intern();
                 screen.hashCode = screen.fqname.hashCode();
                 screenList.add(screen);
                 if(DEBUG) {
@@ -157,7 +158,9 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
 
         synchronized(screenList) {
             screenList.remove(this);
-            screensActive--;
+            if(0 < screensActive) {
+                screensActive--;
+            }
         }
 
         if ( null != aScreen ) {
@@ -183,11 +186,15 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
 
     public synchronized final int removeReference() {
         if(DEBUG) {
-            System.err.println("Screen.removeReference() ("+DisplayImpl.getThreadName()+"): "+refCount+" -> "+(refCount-1));
+            String msg = "Screen.removeReference() ("+DisplayImpl.getThreadName()+"): "+refCount+" -> "+(refCount-1);
+            // Throwable t = new Throwable(msg);
+            // t.printStackTrace();
+            System.err.println(msg);
         }
-        refCount--; // could become < 0, in case of forced destruction without actual creation/addReference
-        if(0>=refCount && getDestroyWhenUnused()) {
+        refCount--; // could become < 0, in case of manual destruction without actual creation/addReference
+        if(0>=refCount) {
             destroy();
+            refCount=0; // fix < 0
         }
         return refCount;
     }
@@ -196,13 +203,6 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
         return refCount;
     }
 
-    public final boolean getDestroyWhenUnused() { 
-        return display.getDestroyWhenUnused(); 
-    }
-    public final void setDestroyWhenUnused(boolean v) { 
-        display.setDestroyWhenUnused(v); 
-    }
-
     protected abstract void createNativeImpl();
     protected abstract void closeNativeImpl();
 
@@ -260,7 +260,7 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
         ScreenMode smU = null;
         ScreenModeStatus sms = ScreenModeStatus.getScreenModeStatus(this.getFQName());
         if(null != sms) {
-            ScreenMode sm0 = ( DisableScreenModeImpl ) ? null : getCurrentScreenModeImpl();
+            ScreenMode sm0 = ( DEBUG_TEST_SCREENMODE_DISABLED ) ? null : getCurrentScreenModeImpl();
             if(null == sm0) {
                 return null;
             }
@@ -415,7 +415,7 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
                 ArrayHashSet screenModes = collectNativeScreenModes(screenModesIdx2NativeIdx);
                 sms = new ScreenModeStatus(screenModes, screenModesIdx2NativeIdx);
                 if(null!=screenModes && screenModes.size()>0) {
-                    ScreenMode originalScreenMode = ( DisableScreenModeImpl ) ? null : getCurrentScreenModeImpl();
+                    ScreenMode originalScreenMode = ( DEBUG_TEST_SCREENMODE_DISABLED ) ? null : getCurrentScreenModeImpl();
                     if(null != originalScreenMode) {
                         ScreenMode originalScreenMode0 = (ScreenMode) screenModes.get(originalScreenMode); // unify via value hash
                         if(null == originalScreenMode0) {
@@ -450,7 +450,7 @@ public abstract class ScreenImpl extends Screen implements ScreenModeListener {
                            + ScreenModeUtil.NUM_SURFACE_SIZE_PROPERTIES
                            - 1 ; // index 0 based
         do {
-            if(DisableScreenModeImpl) {
+            if(DEBUG_TEST_SCREENMODE_DISABLED) {
                 smProps = null;
             } else if(0 == num) {
                 smProps = getScreenModeFirstImpl();
diff --git a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
index c34081ebf..9f744be82 100644
--- a/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
+++ b/src/newt/classes/com/jogamp/newt/impl/WindowImpl.java
@@ -71,6 +71,59 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
 {
     public static final boolean DEBUG_TEST_REPARENT_INCOMPATIBLE = Debug.isPropertyDefined("newt.test.Window.reparent.incompatible", true);
     
+    private RecursiveLock windowLock = new RecursiveLock();
+    private long   windowHandle;
+    private ScreenImpl screen;
+    private boolean screenReferenceAdded = false;
+    private NativeWindow parentWindow;
+    private long parentWindowHandle;
+    protected AbstractGraphicsConfiguration config;
+    protected Capabilities caps;
+    protected boolean fullscreen, visible, hasFocus;
+    protected int width, height, x, y;
+    protected int nfs_width, nfs_height, nfs_x, nfs_y; // non fullscreen dimensions ..
+    protected String title = "Newt Window";
+    protected boolean undecorated = false;
+    private LifecycleHook lifecycleHook = null;
+
+    private DestroyAction destroyAction = new DestroyAction();
+    private boolean handleDestroyNotify = true;
+
+    private ReparentActionRecreate reparentActionRecreate = new ReparentActionRecreate();
+
+    private RequestFocusAction requestFocusAction = new RequestFocusAction();
+    private FocusRunnable focusAction = null;
+
+    private Object surfaceUpdatedListenersLock = new Object();
+    private ArrayList surfaceUpdatedListeners;
+
+    private Object childWindowsLock = new Object();
+    private ArrayList childWindows;
+
+    private ArrayList mouseListeners;
+    private int  mouseButtonPressed;  // current pressed mouse button number
+    private long lastMousePressed;    // last time when a mouse button was pressed
+    private int  lastMouseClickCount; // last mouse button click count
+
+    private ArrayList keyListeners;
+
+    private ArrayList windowListeners;
+    private boolean repaintQueued = false;
+
+    private void initializeStates() {
+        invalidate(true);
+
+        childWindows = new ArrayList();
+        surfaceUpdatedListeners = new ArrayList();
+        windowListeners =  new ArrayList();
+        mouseListeners = new ArrayList();
+
+        mouseButtonPressed = 0; // current pressed mouse button number
+        lastMousePressed = 0; // last time when a mouse button was pressed
+        lastMouseClickCount = 0; // last mouse button click count
+        keyListeners = new ArrayList();
+    }
+
     // Workaround for initialization order problems on Mac OS X
     // between native Newt and (apparently) Fmod -- if Fmod is
     // initialized first then the connection to the window server
@@ -89,8 +142,8 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     // Construction Methods
     //
 
-    private static Class getWindowClass(String type) 
-        throws ClassNotFoundException 
+    private static Class getWindowClass(String type)
+        throws ClassNotFoundException
     {
         Class windowClass = NewtFactory.getCustomClass(type, "Window");
         if(null==windowClass) {
@@ -120,7 +173,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                 windowClass = OffscreenWindow.class;
             }
             WindowImpl window = (WindowImpl) windowClass.newInstance();
-            window.invalidate(true);
+            window.initializeStates();
             window.parentWindow = parentWindow;
             window.parentWindowHandle = parentWindowHandle;
             window.screen = (ScreenImpl) screen;
@@ -145,7 +198,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                 throw new NativeWindowException("WindowClass "+windowClass+" constructor mismatch at argument #"+argsChecked+"; Constructor: "+getTypeStrList(cstrArgumentTypes)+", arguments: "+getArgsStrList(cstrArguments));
             }
             WindowImpl window = (WindowImpl) ReflectionUtil.createInstance( windowClass, cstrArgumentTypes, cstrArguments ) ;
-            window.invalidate(true);
+            window.initializeStates();
             window.screen = (ScreenImpl) screen;
             window.caps = (Capabilities)caps.clone();
             return window;
@@ -174,7 +227,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
          * Surface not locked yet.<br>
          * Called not necessarily from EDT.
          */
-        void destroyActionPreLock(boolean unrecoverable);
+        void destroyActionPreLock();
 
         /**
          * Invoked before Window destroy action,
@@ -182,7 +235,14 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
          * Surface locked.<br>
          * Called from EDT while window is locked.
          */
-        void destroyActionInLock(boolean unrecoverable);
+        void destroyActionInLock();
+
+        /**
+         * Invoked after destruction from Window's invalidate method.<br>
+         * Called while window is locked.
+         * @param unrecoverable
+         */
+        void invalidate(boolean unrecoverable);
 
         /**
          * Invoked for expensive modifications, ie while reparenting and ScreenMode change.<br>
@@ -201,41 +261,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         void resumeRenderingAction();
     }
 
-    private LifecycleHook lifecycleHook = null;
-    private RecursiveLock windowLock = new RecursiveLock();
-    private long   windowHandle;
-    private ScreenImpl screen;
-    private boolean screenReferenced = false;
-    private NativeWindow parentWindow;
-    private long parentWindowHandle;
-
-    protected AbstractGraphicsConfiguration config;
-    protected Capabilities caps;
-    protected boolean fullscreen, visible, hasFocus;
-    protected int width, height, x, y;
-    protected int nfs_width, nfs_height, nfs_x, nfs_y; // non fullscreen dimensions ..
-
-    protected String title = "Newt Window";
-    protected boolean undecorated = false;
-    private boolean handleDestroyNotify = true;
-
-    private final void destroyScreen() {
-        if(null!=screen) {
-            if(screenReferenced) {
-                screen.removeReference();
-                screenReferenced = false;
-            }
-            screen = null;
-        }
-    }
-    private final void setScreen(ScreenImpl newScreen) {
-        if(screenReferenced) {
-            screenReferenced = false;
-            screen.removeReference();
-        }
-        screen = newScreen;
-    }
-
     private boolean createNative() {
         if(DEBUG_IMPLEMENTATION) {
             System.err.println("Window.createNative() START ("+getThreadName()+", "+this+")");
@@ -246,10 +271,11 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
         try {
             if(validateParentWindowHandle()) {
-                if(!screenReferenced) {
-                    screenReferenced = true;
-                    screen.addReference();
+                if(screenReferenceAdded) {
+                    throw new InternalError("XXX");
                 }
+                screen.addReference();
+                screenReferenceAdded = true;
                 createNativeImpl();
                 setVisibleImpl(true, x, y, width, height);
                 screen.addScreenModeListener(this);
@@ -265,6 +291,36 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         return 0 != windowHandle ;
     }
 
+    private void removeScreenReference() {
+        if(screenReferenceAdded) {
+            // be nice, probably already called recursive via
+            //   closeAndInvalidate() -> closeNativeIml() -> .. -> windowDestroyed() -> closeAndInvalidate() !
+            // or via reparentWindow .. etc
+            screenReferenceAdded = false;
+            screen.removeReference();
+        }
+    }
+
+    private void closeAndInvalidate() {
+        windowLock.lock();
+        try {
+            if( null != screen ) {
+                if( 0 != windowHandle ) {
+                    screen.removeScreenModeListener(WindowImpl.this);
+                    closeNativeImpl();
+                    removeScreenReference();
+                }
+                Display dpy = screen.getDisplay();
+                if(null != dpy) {
+                    dpy.validateEDT();
+                }
+            }
+            invalidate(false);
+        } finally {
+            windowLock.unlock();
+        }
+    }
+
     private boolean validateParentWindowHandle() {
         if(null!=parentWindow) {
             parentWindowHandle = getNativeWindowHandle(parentWindow);
@@ -446,9 +502,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     // NativeWindow
     //
 
-    public final void destroy() {
-        destroy(false);
-    }
+    // public final void destroy() - see below
 
     public final NativeWindow getParent() {
         return parentWindow;
@@ -649,11 +703,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     }
 
     class DestroyAction implements Runnable {
-        boolean unrecoverable;
-
-        public DestroyAction(boolean unrecoverable) {
-            this.unrecoverable = unrecoverable;
-        }
         public void run() {
             windowLock.lock();
             try {
@@ -663,47 +712,29 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
 
                 // Childs first ..
                 synchronized(childWindowsLock) {
-                  // avoid ConcurrentModificationException: parent -> child -> parent.removeChild(this)
-                  ArrayList clonedChildWindows = (ArrayList) childWindows.clone(); 
-                  while( clonedChildWindows.size() > 0 ) {
-                    NativeWindow nw = (NativeWindow) clonedChildWindows.remove(0);
-                    if(nw instanceof WindowImpl) {
-                        ((WindowImpl)nw).sendWindowEvent(WindowEvent.EVENT_WINDOW_DESTROY_NOTIFY);
-                        if(unrecoverable) {
-                            ((WindowImpl)nw).destroy(unrecoverable);
-                        }
-                    } else {
-                        nw.destroy();
+                  if(childWindows.size()>0) {
+                    // avoid ConcurrentModificationException: parent -> child -> parent.removeChild(this)
+                    ArrayList clonedChildWindows = (ArrayList) childWindows.clone();
+                    while( clonedChildWindows.size() > 0 ) {
+                      NativeWindow nw = (NativeWindow) clonedChildWindows.remove(0);
+                      if(nw instanceof WindowImpl) {
+                          ((WindowImpl)nw).sendWindowEvent(WindowEvent.EVENT_WINDOW_DESTROY_NOTIFY);
+                          ((WindowImpl)nw).destroy();
+                      } else {
+                          nw.destroy();
+                      }
                     }
                   }
                 }
 
                 if(null!=lifecycleHook) {
-                    lifecycleHook.destroyActionInLock(unrecoverable);
+                    lifecycleHook.destroyActionInLock();
                 }
 
-                // Now us ..
-                if(unrecoverable) {
-                    if(null!=parentWindow && parentWindow instanceof Window) {
-                        ((Window)parentWindow).removeChild(WindowImpl.this);
-                    }
-                    synchronized(childWindowsLock) {
-                        childWindows = new ArrayList();
-                    }
-                    synchronized(surfaceUpdatedListenersLock) {
-                        surfaceUpdatedListeners = new ArrayList();
-                    }
-                    windowListeners = new ArrayList();
-                    mouseListeners = new ArrayList();
-                    keyListeners = new ArrayList();
-                }
-                if( null != screen && 0 != windowHandle ) {
-                    screen.removeScreenModeListener(WindowImpl.this);
-                    closeNativeImpl();
-                }
-                invalidate(unrecoverable);
+                closeAndInvalidate();
+
                 if(DEBUG_IMPLEMENTATION) {
-                    System.err.println("Window.destroy(unrecoverable: "+unrecoverable+") END "+getThreadName()/*+", "+WindowImpl.this*/);
+                    System.err.println("Window.destroy() END "+getThreadName()/*+", "+WindowImpl.this*/);
                 }
             } finally {
                 windowLock.unlock();
@@ -711,36 +742,27 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
     }
 
-    public void destroy(boolean unrecoverable) {
+    public void destroy() {
         if( isValid() ) {
             if(DEBUG_IMPLEMENTATION) {
-                String msg = new String("Window.destroy(unrecoverable: "+unrecoverable+") START "+getThreadName()/*+", "+this*/);
+                String msg = new String("Window.destroy() START "+getThreadName()/*+", "+this*/);
                 System.err.println(msg);
                 //Exception ee = new Exception(msg);
                 //ee.printStackTrace();
-            }            
+            }
             if(null!=lifecycleHook) {
-                lifecycleHook.destroyActionPreLock(unrecoverable);
+                lifecycleHook.pauseRenderingAction();
+            }
+            if(null!=lifecycleHook) {
+                lifecycleHook.destroyActionPreLock();
             }
-            DestroyAction destroyAction = new DestroyAction(unrecoverable);
             runOnEDTIfAvail(true, destroyAction);
         }
     }
 
-    /**
-     * <p>
-     * render all native window information invalid,
-     * as if the native window was destroyed.<br></p>
-     * <p>
-     * all other resources and states are kept intact,
-     * ie listeners, parent handles and size, position etc.<br></p>
-     *
-     * @see #destroy()
-     * @see #destroy(boolean)
-     * @see #invalidate(boolean)
-     */
     public final void invalidate() {
-        invalidate(false);
+        destroy();
+        invalidate(true);
     }
 
     /**
@@ -757,16 +779,49 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
             if(DEBUG_IMPLEMENTATION || DEBUG_WINDOW_EVENT) {
                 String msg = new String("!!! Window Invalidate(unrecoverable: "+unrecoverable+") "+getThreadName());
                 System.err.println(msg);
-                // Exception e = new Exception(msg);
-                // e.printStackTrace();
+                // Throwable t = new Throwable(msg);
+                // t.printStackTrace();
+            }
+
+            // Childs first ..
+            synchronized(childWindowsLock) {
+              // avoid ConcurrentModificationException: parent -> child -> parent.removeChild(this)
+              if(null!=childWindows && childWindows.size()>0) {
+                ArrayList clonedChildWindows = (ArrayList) childWindows.clone();
+                while( clonedChildWindows.size() > 0 ) {
+                  NativeWindow nw = (NativeWindow) clonedChildWindows.remove(0);
+                  if(nw instanceof WindowImpl) {
+                      ((WindowImpl)nw).invalidate(unrecoverable);
+                  }
+                }
+              }
             }
+
+            if(null!=lifecycleHook) {
+                lifecycleHook.invalidate(unrecoverable);
+            }
+
             windowHandle = 0;
             visible = false;
             fullscreen = false;
             hasFocus = false;
 
             if(unrecoverable) {
-                destroyScreen();
+                if(null!=parentWindow && parentWindow instanceof Window) {
+                    ((Window)parentWindow).removeChild(WindowImpl.this);
+                }
+                screen = null;
+
+                synchronized(childWindowsLock) {
+                    childWindows = null;
+                }
+                synchronized(surfaceUpdatedListenersLock) {
+                    surfaceUpdatedListeners = null;
+                }
+                windowListeners = null;
+                mouseListeners = null;
+                keyListeners = null;
+
                 parentWindowHandle = 0;
                 parentWindow = null;
                 caps = null;
@@ -794,10 +849,15 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
             this.reparentAction = -1; // ensure it's set
         }
 
-        public int getStrategy() {
+        public final int getStrategy() {
             return reparentAction;
         }
 
+        private final void setScreen(ScreenImpl newScreen) {
+            WindowImpl.this.removeScreenReference();
+            screen = newScreen;
+        }
+
         public void run() {
             boolean wasVisible;
 
@@ -846,9 +906,9 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                         if(null==newParentWindowNEWT) {
                             throw new NativeWindowException("Reparenting with non NEWT Window type only available after it's realized: "+newParentWindow);
                         }
-                        // Destroy this window (handle screen + native) and use parent's Screen.
+                        // Destroy this window and use parent's Screen.
                         // It may be created properly when the parent is made visible.
-                        destroy(false);
+                        destroy();
                         setScreen( (ScreenImpl) newParentWindowNEWT.getScreen() );
                         reparentAction = ACTION_NATIVE_CREATION_PENDING;
                     } else if(newParentWindow != getParent()) {
@@ -862,7 +922,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                                 Screen newScreen = NewtFactory.createCompatibleScreen(newParentWindow, getScreen());
                                 if( getScreen() != newScreen ) {
                                     // auto destroy on-the-fly created Screen/Display
-                                    newScreen.setDestroyWhenUnused(true);
                                     setScreen( (ScreenImpl) newScreen );
                                 }
                             }
@@ -873,15 +932,13 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                             }
                         } else if ( DEBUG_TEST_REPARENT_INCOMPATIBLE || forceDestroyCreate ||
                                     !NewtFactory.isScreenCompatible(newParentWindow, getScreen()) ) {
-                            // Destroy this window (handle screen + native) and
-                            // may create a new compatible Screen/Display and
-                            // mark it for creation.
-                            destroy(false);
+                            // Destroy this window, may create a new compatible Screen/Display,
+                            // and mark it for creation.
+                            destroy();
                             if(null!=newParentWindowNEWT) {
                                 setScreen( (ScreenImpl) newParentWindowNEWT.getScreen() );
                             } else {
                                 setScreen( (ScreenImpl) NewtFactory.createCompatibleScreen(newParentWindow, getScreen()) );
-                                screen.setDestroyWhenUnused(true);
                             }
                             reparentAction = ACTION_NATIVE_CREATION;
                         } else {
@@ -906,9 +963,8 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                         // Already Top Window
                         reparentAction = ACTION_UNCHANGED;
                     } else if( !isNativeValid() || DEBUG_TEST_REPARENT_INCOMPATIBLE || forceDestroyCreate ) {
-                        // Destroy this window (handle screen + native),
-                        // keep Screen/Display and mark it for creation.
-                        destroy(false);
+                        // Destroy this window and mark it for [pending] creation.
+                        destroy();
                         if( 0<width*height ) {
                             reparentAction = ACTION_NATIVE_CREATION;
                         } else {
@@ -1015,7 +1071,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                         if(DEBUG_IMPLEMENTATION) {
                             System.err.println("Window.reparent: native reparenting failed ("+getThreadName()+") windowHandle "+toHexString(windowHandle)+" parentWindowHandle "+toHexString(parentWindowHandle)+" -> "+toHexString(newParentWindowHandle)+" - Trying recreation");
                         }
-                        destroy(false);
+                        destroy();
                         reparentAction = ACTION_NATIVE_CREATION ;
                     }
                 }
@@ -1065,7 +1121,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
             }
         }
     }
-    private ReparentActionRecreate reparentActionRecreate = new ReparentActionRecreate();
 
     public final int reparentWindow(NativeWindow newParent) {
         return reparentWindow(newParent, false);
@@ -1075,7 +1130,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         int reparentActionStrategy = ReparentAction.ACTION_INVALID;
         if(isValid()) {
             if(null!=lifecycleHook) {
-                // pause animation
                 lifecycleHook.pauseRenderingAction();
             }
             try {
@@ -1084,7 +1138,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
                 reparentActionStrategy = reparentAction.getStrategy();
             } finally {
                 if(null!=lifecycleHook) {
-                    // resume animation
                     lifecycleHook.resumeRenderingAction();
                 }
             }
@@ -1316,7 +1369,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
             WindowImpl.this.requestFocusImpl(false);
         }
     }
-    RequestFocusAction requestFocusAction = new RequestFocusAction();
 
     protected void enqueueRequestFocus(boolean wait) {
         runOnEDTIfAvail(wait, requestFocusAction);
@@ -1345,7 +1397,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
         return res;
     }
-    protected FocusRunnable focusAction = null;
 
     class SetPositionActionImpl implements Runnable {
         int x, y;
@@ -1475,7 +1526,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
 
         if(null!=lifecycleHook) {
-            // pause animation
             lifecycleHook.pauseRenderingAction();
         }
     }
@@ -1494,7 +1544,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
 
         if(null!=lifecycleHook) {
-            // resume animation
             lifecycleHook.resumeRenderingAction();
             sendWindowEvent(WindowEvent.EVENT_WINDOW_RESIZED); // trigger a resize/relayout and repaint to listener
         }
@@ -1504,9 +1553,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     // Child Window Management
     // 
 
-    private ArrayList childWindows = new ArrayList();
-    private Object childWindowsLock = new Object();
-
     public final void removeChild(NativeWindow win) {
         synchronized(childWindowsLock) {
             childWindows.remove(win);
@@ -1591,15 +1637,11 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         }
         return true;
     }
-    protected boolean repaintQueued = false;
 
     //
     // SurfaceUpdatedListener Support
     //
 
-    private ArrayList surfaceUpdatedListeners = new ArrayList();
-    private Object surfaceUpdatedListenersLock = new Object();
-
     public void addSurfaceUpdatedListener(SurfaceUpdatedListener l) {
         addSurfaceUpdatedListener(-1, l);
     }
@@ -1660,11 +1702,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
     //
     // MouseListener/Event Support
     //
-    private ArrayList mouseListeners = new ArrayList();
-    private int  mouseButtonPressed = 0; // current pressed mouse button number
-    private long lastMousePressed = 0; // last time when a mouse button was pressed
-    private int  lastMouseClickCount = 0; // last mouse button click count
-
     public void sendMouseEvent(int eventType, int modifiers,
                                int x, int y, int button, int rotation) {
         doMouseEvent(false, false, eventType, modifiers, x, y, button, rotation);
@@ -1857,8 +1894,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         return (KeyListener[]) keyListeners.toArray();
     }
 
-    private ArrayList keyListeners = new ArrayList();
-
     protected void consumeKeyEvent(KeyEvent e) {
         if(DEBUG_KEY_EVENT) {
             System.err.println("consumeKeyEvent: "+e);
@@ -1892,8 +1927,6 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         enqueueEvent( wait, new WindowEvent(eventType, this, System.currentTimeMillis()) );
     }
 
-    private ArrayList windowListeners = new ArrayList();
-
     public void addWindowListener(WindowListener l) {
         addWindowListener(-1, l);
     }
@@ -2055,7 +2088,7 @@ public abstract class WindowImpl implements Window, NEWTEventConsumer, ScreenMod
         if(DEBUG_IMPLEMENTATION) {
             System.err.println("Window.windowDestroyed "+getThreadName());
         }
-        invalidate();
+        closeAndInvalidate();
     }
 
     public void windowRepaint(int x, int y, int width, int height) {
diff --git a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
index f84c65cb7..72963eaa3 100644
--- a/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
+++ b/src/newt/classes/com/jogamp/newt/opengl/GLWindow.java
@@ -246,8 +246,8 @@ public class GLWindow implements GLAutoDrawable, Window {
     // Window.LifecycleHook Implementation
     //
 
-    public final void destroy(boolean unrecoverable) {
-        window.destroy(unrecoverable);
+    public final void destroy() {
+        window.destroy();
     }
 
     public final void setVisible(boolean visible) {
@@ -282,23 +282,14 @@ public class GLWindow implements GLAutoDrawable, Window {
         DisposeAction disposeAction = new DisposeAction();
 
         /** Window.LifecycleHook */
-        public synchronized void destroyActionPreLock(boolean unrecoverable) {
-            GLAnimatorControl animator = GLWindow.this.getAnimator();
-            if(null!=animator) {
-                if(unrecoverable) {
-                    if(animator.isStarted()) {
-                        animator.stop();
-                    }
-                } else if(animator.isAnimating()) {
-                    animator.pause();
-                }
-            }
+        public synchronized void destroyActionPreLock() {
+            // nop
         }
 
         /** Window.LifecycleHook */
-        public synchronized void destroyActionInLock(boolean unrecoverable) {
+        public synchronized void destroyActionInLock() {
             if(Window.DEBUG_WINDOW_EVENT || Window.DEBUG_IMPLEMENTATION) {
-                String msg = new String("GLWindow.destroy("+unrecoverable+") "+Thread.currentThread()+", start");
+                String msg = new String("GLWindow.destroy() "+Thread.currentThread()+", start");
                 System.err.println(msg);
                 //Exception e1 = new Exception(msg);
                 //e1.printStackTrace();
@@ -320,12 +311,25 @@ public class GLWindow implements GLAutoDrawable, Window {
             context = null;
             drawable = null;
 
-            if(unrecoverable) {
-                helper=null;
+            if(Window.DEBUG_WINDOW_EVENT || Window.DEBUG_IMPLEMENTATION) {
+                System.err.println("GLWindow.destroy() "+Thread.currentThread()+", fin");
             }
+        }
 
+        /** Window.LifecycleHook */
+        public synchronized void invalidate(boolean unrecoverable) {
             if(Window.DEBUG_WINDOW_EVENT || Window.DEBUG_IMPLEMENTATION) {
-                System.err.println("GLWindow.destroy("+unrecoverable+") "+Thread.currentThread()+", fin");
+                String msg = new String("GLWindow.invalidate("+unrecoverable+") "+Thread.currentThread()+", start");
+                System.err.println(msg);
+                //Exception e1 = new Exception(msg);
+                //e1.printStackTrace();
+            }
+            if(unrecoverable) {
+                GLAnimatorControl ctrl = GLWindow.this.getAnimator();
+                if ( null!=ctrl && ctrl.isStarted() ) {
+                    ctrl.stop();
+                }
+                helper=null;
             }
         }
 
@@ -635,10 +639,6 @@ public class GLWindow implements GLAutoDrawable, Window {
         return null!=drawable ? drawable.getHandle() : 0;
     }
 
-    public final void destroy() {
-        window.destroy();
-    }
-
     public final int getX() {
         return window.getX();
     }
@@ -878,7 +878,7 @@ public class GLWindow implements GLAutoDrawable, Window {
         });
 
         glWindow.setVisible(true);
-        glWindow.destroy(true);
+        glWindow.invalidate();
     }
 
 }