Fix Bug 691 (part-2): Extra '[subLayer release]' is wrong, since 'CGL.releaseNSOpenGLLayer' triggers release - but very late w/ AWT usage.

OSXUtil_RemoveCASublayer0's added '[subLayer release]' in commit f6e6fab2a7ddfb5c9b614cb072c27ff697629161
is wrong, since 'CGL.releaseNSOpenGLLayer' actually does trigger it's release.
This was not seen w/ AWT tests, since it happens very later.
A NewtCanvasAWT test disclosed this error -> removed that extra release call.

The culprit for the late release w/ AWT usage was CGL.createNSOpenGLLayer's call in the current thread.
Moving it to the Main-Thread fixed the problem.

All CALayer lifecycle calls are issued on the Main-Thread now.

NSOpenGLLayer's CVDisplayLink OpenGL fitting via 'CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext'
is now performed at it's context creation in 'NSOpenGLLayer::openGLContextForPixelFormat'.

The 'extra' release of the NSOpenGLLayer's NSOpenGLContext as introduced in commit f6e6fab2a7ddfb5c9b614cb072c27ff697629161
is still valid.

13 files changed, 438 insertions, 107 deletions

diff --git a/make/config/jogl/cgl-macosx-CustomJavaCode.java b/make/config/jogl/cgl-macosx-CustomJavaCode.java
new file mode 100644
index 000000000..b9a37d0c6
--- /dev/null
+++ b/make/config/jogl/cgl-macosx-CustomJavaCode.java
@@ -0,0 +1,22 @@
+
+/**
+ * Creates the NSOpenGLLayer for FBO/PBuffer w/ optional GL3 shader program on Main-Thread
+ */
+public static long createNSOpenGLLayer(final long ctx, final int gl3ShaderProgramName, final long fmt, final long p, 
+                                       final int texID, final boolean opaque, final int texWidth, final int texHeight) {
+  return OSXUtil.RunOnMainThread(true, new Function<Long, Object>() {
+   public Long eval(Object... args) {
+       return Long.valueOf( createNSOpenGLLayerImpl(ctx, gl3ShaderProgramName, fmt, p, texID, opaque, texWidth, texHeight) );
+   } } ).longValue();
+}
+
+/**
+ * Releases the NSOpenGLLayer on Main-Thread
+ */
+public static void releaseNSOpenGLLayer(final long nsOpenGLLayer) {
+  OSXUtil.RunOnMainThread(true, new Runnable() {
+      public void run() {
+          releaseNSOpenGLLayerImpl(nsOpenGLLayer);
+      } } );
+}
+
diff --git a/make/config/jogl/cgl-macosx.cfg b/make/config/jogl/cgl-macosx.cfg
index 203802d29..98123f605 100644
--- a/make/config/jogl/cgl-macosx.cfg
+++ b/make/config/jogl/cgl-macosx.cfg
@@ -34,6 +34,13 @@ Opaque long NSOpenGLLayer *
 CustomCCode #include </usr/include/machine/types.h>
 CustomCCode #include "macosx-window-system.h"
 
+AccessControl createNSOpenGLLayerImpl PRIVATE
+AccessControl releaseNSOpenGLLayerImpl PRIVATE
+RenameJavaMethod createNSOpenGLLayer createNSOpenGLLayerImpl
+RenameJavaMethod releaseNSOpenGLLayer releaseNSOpenGLLayerImpl
+
+IncludeAs CustomJavaCode CGL cgl-macosx-CustomJavaCode.java
+
 # Implement the first argument to getProcAddress as String instead
 # of byte[]
 ArgumentIsString getProcAddress 0
@@ -53,3 +60,5 @@ DropUniqVendorExtensions SGIX
 DropUniqVendorExtensions SUN
 DropUniqVendorExtensions WIN
 
+Import com.jogamp.common.util.Function
+Import jogamp.nativewindow.macosx.OSXUtil
diff --git a/make/scripts/tests.sh b/make/scripts/tests.sh
index 198a8f2e6..5f5248156 100755
--- a/make/scripts/tests.sh
+++ b/make/scripts/tests.sh
@@ -34,7 +34,7 @@ uname -a | grep -i Darwin && MOSX=1
 if [ $MOSX -eq 1 ] ; then
     echo setup OSX environment vars
     #export NSZombieEnabled=YES
-    export NSTraceEvents=YES
+    #export NSTraceEvents=YES
     #export OBJC_PRINT_EXCEPTIONS=YES
     echo NSZombieEnabled $NSZombieEnabled 2>&1 | tee -a java-run.log
     echo NSTraceEvents $NSTraceEvents  2>&1 | tee -a java-run.log
@@ -89,7 +89,7 @@ function jrun() {
     #D_ARGS="-Djogl.debug.FBObject"
     #D_ARGS="-Djogl.debug.GLSLCode"
     #D_ARGS="-Djogl.debug.GLSLCode -Djogl.debug.DebugGL -Djogl.debug.TraceGL"
-    #D_ARGS="-Djogl.debug.GLContext -Djogl.debug.GLContext.TraceSwitch -Dnativewindow.debug.JAWT"
+    #D_ARGS="-Djogl.debug.GLContext -Dnativewindow.debug.JAWT -Dnewt.debug.Window"
     #D_ARGS="-Djogl.debug.GLContext.TraceSwitch"
     #D_ARGS="-Djogl.debug.FixedFuncPipeline -Djogl.debug.GLSLCode"
     #D_ARGS="-Djogl.debug.FixedFuncPipeline -Djogl.debug.GLSLState"
@@ -311,6 +311,8 @@ function testawtswt() {
 
 #testawt com.jogamp.opengl.test.junit.jogl.acore.TestOffscreenLayer01GLCanvasAWT $*
 #testawt com.jogamp.opengl.test.junit.jogl.acore.TestOffscreenLayer02NewtCanvasAWT $*
+#testawt com.jogamp.opengl.test.junit.jogl.awt.TestGLCanvasAddRemove01SwingAWT $*
+testawt com.jogamp.opengl.test.junit.jogl.awt.TestGLCanvasAddRemove02NewtCanvasAWT $*
 
 #testnoawt com.jogamp.opengl.test.junit.jogl.acore.TestFBOAutoDrawableFactoryNEWT $*
 #testnoawt com.jogamp.opengl.test.junit.jogl.acore.TestFBOOffThreadSharedContextMix2DemosES2NEWT $*
@@ -416,11 +418,6 @@ function testawtswt() {
 #testnoawt com.jogamp.opengl.test.junit.jogl.demos.es2.newt.TestGearsES2NEWT $*
 #testawt com.jogamp.opengl.test.junit.newt.event.TestNewtKeyCodesAWT $*
 
-#testawt com.jogamp.opengl.test.junit.jogl.demos.gl2.awt.TestGearsAWT $*
-#testawt com.jogamp.opengl.test.junit.jogl.demos.es2.awt.TestGearsES2AWT $*
-#testawt com.jogamp.opengl.test.junit.jogl.demos.gl2.awt.TestGearsGLJPanelAWT $*
-testawt com.jogamp.opengl.test.junit.jogl.awt.TestGLCanvasAddRemove01SwingAWT $*
-
 #testawt com.jogamp.opengl.test.junit.newt.event.TestNewtKeyCodeModifiersAWT $*
 #testawt com.jogamp.opengl.test.junit.newt.event.TestNewtEventModifiersNEWTWindowAWT $*
 #testawt com.jogamp.opengl.test.junit.newt.event.TestNewtEventModifiersAWTCanvas $*
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
index 0deaa2987..838a0387d 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLContext.java
@@ -709,10 +709,7 @@ public abstract class MacOSXCGLContext extends GLContextImpl
                       // still having a valid OLS attached to surface (parent OLS could have been removed)
                       ols.detachSurfaceLayer();
                   }
-                  OSXUtil.RunOnMainThread(true, new Runnable() {
-                      public void run() {
-                          CGL.releaseNSOpenGLLayer(nsOpenGLLayer);
-                      } } );                  
+                  CGL.releaseNSOpenGLLayer(nsOpenGLLayer);
                   if( null != gl3ShaderProgram ) {
                       gl3ShaderProgram.destroy(MacOSXCGLContext.this.gl.getGL3());
                       gl3ShaderProgram = null;
diff --git a/src/jogl/native/macosx/MacOSXWindowSystemInterface-calayer.m b/src/jogl/native/macosx/MacOSXWindowSystemInterface-calayer.m
index 4334fc676..8d1286169 100644
--- a/src/jogl/native/macosx/MacOSXWindowSystemInterface-calayer.m
+++ b/src/jogl/native/macosx/MacOSXWindowSystemInterface-calayer.m
@@ -75,8 +75,11 @@ extern GLboolean glIsVertexArray (GLuint array);
 - (void)setView:(NSView *)view
 {
     DBG_PRINT("MyNSOpenGLContext.setView: this.0 %p, view %p\n", self, view);
+    // NSLog(@"MyNSOpenGLContext::setView: %@",[NSThread callStackSymbols]);
     if(NULL != view) {
         [super setView:view];
+    } else {
+        [self clearDrawable];
     }
     DBG_PRINT("MyNSOpenGLContext.setView.X\n");
 }
@@ -302,13 +305,6 @@ static const GLfloat gl_verts[] = {
         }
     }
     if(NULL != displayLink) {
-        cvres = CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink, [parentCtx CGLContextObj], [parentPixelFmt CGLPixelFormatObj]);
-        if(kCVReturnSuccess != cvres) {
-            DBG_PRINT("MyNSOpenGLLayer::init %p, CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext failed: %d\n", self, cvres);
-            displayLink = NULL;
-        }
-    }
-    if(NULL != displayLink) {
         cvres = CVDisplayLinkSetOutputCallback(displayLink, renderMyNSOpenGLLayer, self);
         if(kCVReturnSuccess != cvres) {
             DBG_PRINT("MyNSOpenGLLayer::init %p, CVDisplayLinkSetOutputCallback failed: %d\n", self, cvres);
@@ -453,10 +449,20 @@ static const GLfloat gl_verts[] = {
 
 - (NSOpenGLContext *)openGLContextForPixelFormat:(NSOpenGLPixelFormat *)pixelFormat
 {
-    DBG_PRINT("MyNSOpenGLLayer::openGLContextForPixelFormat.0: %p (refcnt %d) - pfmt %p, parent %p\n",
-        self, (int)[self retainCount], pixelFormat, parentCtx);
+    DBG_PRINT("MyNSOpenGLLayer::openGLContextForPixelFormat.0: %p (refcnt %d) - pfmt %p, parent %p, DisplayLink %p\n",
+        self, (int)[self retainCount], pixelFormat, parentCtx, displayLink);
     // NSLog(@"MyNSOpenGLLayer::openGLContextForPixelFormat: %@",[NSThread callStackSymbols]);
     myCtx = [[MyNSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:parentCtx];
+#ifndef HAS_CADisplayLink
+    if(NULL != displayLink) {
+        CVReturn cvres;
+        DBG_PRINT("MyNSOpenGLLayer::openGLContextForPixelFormat.1: setup DisplayLink %p\n", displayLink);
+        cvres = CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink, [myCtx CGLContextObj], [pixelFormat CGLPixelFormatObj]);
+        if(kCVReturnSuccess != cvres) {
+            DBG_PRINT("MyNSOpenGLLayer::init %p, CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext failed: %d\n", self, cvres);
+        }
+    }
+#endif
     DBG_PRINT("MyNSOpenGLLayer::openGLContextForPixelFormat.X: new-ctx %p\n", myCtx);
     return myCtx;
 }
@@ -487,7 +493,6 @@ static const GLfloat gl_verts[] = {
     // [[self openGLContext] release];
     if( NULL != myCtx ) {
         [myCtx release];
-        // [myCtx dealloc];
         myCtx = NULL;
     }
     parentCtx = NULL;
diff --git a/src/nativewindow/classes/jogamp/nativewindow/macosx/OSXUtil.java b/src/nativewindow/classes/jogamp/nativewindow/macosx/OSXUtil.java
index 2e133c22f..b765a68c3 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/macosx/OSXUtil.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/macosx/OSXUtil.java
@@ -136,8 +136,11 @@ public class OSXUtil implements ToolkitProperties {
       return GetNSWindow0(nsView);
     }
     
-    public static long CreateCALayer(int x, int y, int width, int height) {
-        return CreateCALayer0(x, y, width, height);
+    public static long CreateCALayer(final int x, final int y, final int width, final int height) {
+      return OSXUtil.RunOnMainThread(true, new Function<Long, Object>() {
+       public Long eval(Object... args) {
+           return Long.valueOf( CreateCALayer0(x, y, width, height) );
+       } } ).longValue();
     }
     public static void AddCASublayer(final long rootCALayer, final long subCALayer) {
         if(0==rootCALayer || 0==subCALayer) {
@@ -145,7 +148,7 @@ public class OSXUtil implements ToolkitProperties {
         }
         RunOnMainThread(true, new Runnable() {
            public void run() {
-               AddCASublayer0(rootCALayer, subCALayer);               
+               AddCASublayer0(rootCALayer, subCALayer);
            }
         });
     }
@@ -205,6 +208,13 @@ public class OSXUtil implements ToolkitProperties {
         }
     }
     
+    private static Runnable _nop = new Runnable() { public void run() {}; };
+    
+    /** Issues a {@link #RunOnMainThread(boolean, Runnable)} w/ an <i>NOP</i> runnable, while waiting until done. */ 
+    public static void WaitUntilFinish() {
+        RunOnMainThread(true, _nop);
+    }
+    
     /**
      * Run on OSX UI main thread.
      * <p> 
diff --git a/src/nativewindow/native/macosx/OSXmisc.m b/src/nativewindow/native/macosx/OSXmisc.m
index 3fa320042..83f3c821f 100644
--- a/src/nativewindow/native/macosx/OSXmisc.m
+++ b/src/nativewindow/native/macosx/OSXmisc.m
@@ -32,6 +32,7 @@
 #include <stdarg.h>
 #include <unistd.h>
 #include <AppKit/AppKit.h>
+#import <QuartzCore/QuartzCore.h>
 
 #include "NativewindowCommon.h"
 #include "jogamp_nativewindow_macosx_OSXUtil.h"
@@ -323,6 +324,64 @@ JNIEXPORT jlong JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_GetNSWindow0
     return res;
 }
 
+/**
+ * Track lifecycle via DBG_PRINT messages, if VERBOSE is enabled!
+ */
+@interface MyCALayer: CALayer
+{
+}
+- (id)init;
+#ifdef DBG_LIFECYCLE
+- (id)retain;
+- (oneway void)release;
+- (void)dealloc;
+#endif
+
+@end
+
+@implementation MyCALayer
+
+- (id)init
+{
+    DBG_PRINT("MyCALayer.0\n");
+    MyCALayer * o = [super init];
+    DBG_PRINT("MyNSOpenGLContext.init.X: new %p\n", o);
+    DBG_PRINT("MyCALayer.0\n");
+    return o;
+}
+
+#ifdef DBG_LIFECYCLE
+
+- (id)retain
+{
+    DBG_PRINT("MyCALayer::retain.0: %p (refcnt %d)\n", self, (int)[self retainCount]);
+    // NSLog(@"MyCALayer::retain: %@",[NSThread callStackSymbols]);
+    id o = [super retain];
+    DBG_PRINT("MyCALayer::retain.X: %p (refcnt %d)\n", o, (int)[o retainCount]);
+    return o;
+}
+
+- (oneway void)release
+{
+    DBG_PRINT("MyCALayer::release.0: %p (refcnt %d)\n", self, (int)[self retainCount]);
+    // NSLog(@"MyCALayer::release: %@",[NSThread callStackSymbols]);
+    [super release];
+    // DBG_PRINT("MyCALayer::release.X: %p (refcnt %d)\n", self, (int)[self retainCount]);
+}
+
+- (void)dealloc
+{
+    DBG_PRINT("MyCALayer::dealloc.0 %p (refcnt %d)\n", self, (int)[self retainCount]);
+    // NSLog(@"MyCALayer::dealloc: %@",[NSThread callStackSymbols]);
+    [super dealloc];
+    // DBG_PRINT("MyCALayer.dealloc.X: %p\n", self);
+}
+
+#endif
+
+
+@end
+
 /*
  * Class:     Java_jogamp_nativewindow_macosx_OSXUtil
  * Method:    CreateCALayer0
@@ -333,7 +392,7 @@ JNIEXPORT jlong JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_CreateCALayer0
 {
     NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
 
-    CALayer* layer = [[CALayer alloc] init];
+    MyCALayer* layer = [[MyCALayer alloc] init];
     DBG_PRINT("CALayer::CreateCALayer.0: root %p %d/%d %dx%d (refcnt %d)\n", layer, (int)x, (int)y, (int)width, (int)height, (int)[layer retainCount]);
     // avoid zero size
     if(0 == width) { width = 32; }
@@ -349,12 +408,12 @@ JNIEXPORT jlong JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_CreateCALayer0
     // no animations for add/remove/swap sublayers etc 
     // doesn't work: [layer removeAnimationForKey: kCAOnOrderIn, kCAOnOrderOut, kCATransition]
     [layer removeAllAnimations];
+    // [layer addAnimation:nil forKey:kCATransition];
     [layer setAutoresizingMask: (kCALayerWidthSizable|kCALayerHeightSizable)];
     [layer setNeedsDisplayOnBoundsChange: YES];
     DBG_PRINT("CALayer::CreateCALayer.1: root %p %lf/%lf %lfx%lf\n", layer, lRect.origin.x, lRect.origin.y, lRect.size.width, lRect.size.height);
-    DBG_PRINT("CALayer::CreateCALayer.X: root %p (refcnt %d)\n", layer, (int)[layer retainCount]);
-
     [pool release];
+    DBG_PRINT("CALayer::CreateCALayer.X: root %p (refcnt %d)\n", layer, (int)[layer retainCount]);
 
     return (jlong) ((intptr_t) layer);
 }
@@ -367,8 +426,8 @@ JNIEXPORT jlong JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_CreateCALayer0
 JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_AddCASublayer0
   (JNIEnv *env, jclass unused, jlong rootCALayer, jlong subCALayer)
 {
-    JNF_COCOA_ENTER(env);
-    CALayer* rootLayer = (CALayer*) ((intptr_t) rootCALayer);
+    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+    MyCALayer* rootLayer = (MyCALayer*) ((intptr_t) rootCALayer);
     CALayer* subLayer = (CALayer*) ((intptr_t) subCALayer);
 
     CGRect lRectRoot = [rootLayer frame];
@@ -385,6 +444,9 @@ JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_AddCASublayer0
         rootLayer, (int)[rootLayer retainCount],
         subLayer, lRectRoot.origin.x, lRectRoot.origin.y, lRectRoot.size.width, lRectRoot.size.height, (int)[subLayer retainCount]);
 
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     // simple 1:1 layout !
     [subLayer setFrame:lRectRoot];
     [rootLayer addSublayer:subLayer];
@@ -392,14 +454,19 @@ JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_AddCASublayer0
     // no animations for add/remove/swap sublayers etc 
     // doesn't work: [layer removeAnimationForKey: kCAOnOrderIn, kCAOnOrderOut, kCATransition]
     [rootLayer removeAllAnimations];
+    // [rootLayer addAnimation:nil forKey:kCATransition];
     [rootLayer setAutoresizingMask: (kCALayerWidthSizable|kCALayerHeightSizable)];
     [rootLayer setNeedsDisplayOnBoundsChange: YES];
     [subLayer removeAllAnimations];
+    // [sublayer addAnimation:nil forKey:kCATransition];
     [subLayer setAutoresizingMask: (kCALayerWidthSizable|kCALayerHeightSizable)];
     [subLayer setNeedsDisplayOnBoundsChange: YES];
+
+    [CATransaction commit];
+
+    [pool release];
     DBG_PRINT("CALayer::AddCASublayer0.X: root %p (refcnt %d) .sub %p (refcnt %d)\n", 
         rootLayer, (int)[rootLayer retainCount], subLayer, (int)[subLayer retainCount]);
-    JNF_COCOA_EXIT(env);
 }
 
 /*
@@ -410,19 +477,26 @@ JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_AddCASublayer0
 JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_RemoveCASublayer0
   (JNIEnv *env, jclass unused, jlong rootCALayer, jlong subCALayer)
 {
-    JNF_COCOA_ENTER(env);
-    CALayer* rootLayer = (CALayer*) ((intptr_t) rootCALayer);
+    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+    MyCALayer* rootLayer = (MyCALayer*) ((intptr_t) rootCALayer);
     CALayer* subLayer = (CALayer*) ((intptr_t) subCALayer);
 
     (void)rootLayer; // no warnings
 
     DBG_PRINT("CALayer::RemoveCASublayer0.0: root %p (refcnt %d) .sub %p (refcnt %d)\n", 
         rootLayer, (int)[rootLayer retainCount], subLayer, (int)[subLayer retainCount]);
+
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     [subLayer removeFromSuperlayer];
-    [subLayer release];
+    // [subLayer release] is called explicitly, e.g. via CGL.releaseNSOpenGLLayer(..) (MyNSOpenGLLayer::releaseLayer)
+
+    [CATransaction commit];
+
+    [pool release];
     DBG_PRINT("CALayer::RemoveCASublayer0.X: root %p (refcnt %d) .sub %p (refcnt %d)\n", 
         rootLayer, (int)[rootLayer retainCount], subLayer, (int)[subLayer retainCount]);
-    JNF_COCOA_EXIT(env);
 }
 
 /*
@@ -433,14 +507,13 @@ JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_RemoveCASublayer0
 JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_DestroyCALayer0
   (JNIEnv *env, jclass unused, jlong caLayer)
 {
-    JNF_COCOA_ENTER(env);
-    CALayer* layer = (CALayer*) ((intptr_t) caLayer);
+    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+    MyCALayer* layer = (MyCALayer*) ((intptr_t) caLayer);
 
     DBG_PRINT("CALayer::DestroyCALayer0.0: root %p (refcnt %d)\n", layer, (int)[layer retainCount]);
-    [layer release]; // Var.A
-    // [layer dealloc]; // Var.B -> SIGSEGV
+    [layer release]; // Trigger release of root CALayer
+    [pool release];
     DBG_PRINT("CALayer::DestroyCALayer0.X: root %p\n", layer);
-    JNF_COCOA_EXIT(env);
 }
 
 /*
@@ -451,18 +524,18 @@ JNIEXPORT void JNICALL Java_jogamp_nativewindow_macosx_OSXUtil_DestroyCALayer0
 JNIEXPORT jboolean JNICALL Java_jogamp_nativewindow_jawt_macosx_MacOSXJAWTWindow_SetJAWTRootSurfaceLayer0
   (JNIEnv *env, jclass unused, jobject jawtDrawingSurfaceInfoBuffer, jlong caLayer)
 {
-    JNF_COCOA_ENTER(env);
+    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
     JAWT_DrawingSurfaceInfo* dsi = (JAWT_DrawingSurfaceInfo*) (*env)->GetDirectBufferAddress(env, jawtDrawingSurfaceInfoBuffer);
     if (NULL == dsi) {
         NativewindowCommon_throwNewRuntimeException(env, "Argument \"jawtDrawingSurfaceInfoBuffer\" was not a direct buffer");
         return JNI_FALSE;
     }
-    CALayer* layer = (CALayer*) (intptr_t) caLayer;
+    MyCALayer* layer = (MyCALayer*) (intptr_t) caLayer;
     id <JAWT_SurfaceLayers> surfaceLayers = (id <JAWT_SurfaceLayers>)dsi->platformInfo;
     DBG_PRINT("CALayer::SetJAWTRootSurfaceLayer.0: pre %p -> root %p (refcnt %d)\n", surfaceLayers.layer, layer, (int)[layer retainCount]);
-    surfaceLayers.layer = layer; // already incr. retain count
+    surfaceLayers.layer = [layer retain]; // Pairs w/ Unset
+    [pool release];
     DBG_PRINT("CALayer::SetJAWTRootSurfaceLayer.X: root %p (refcnt %d)\n", layer, (int)[layer retainCount]);
-    JNF_COCOA_EXIT(env);
     return JNI_TRUE;
 }
 
@@ -474,23 +547,23 @@ JNIEXPORT jboolean JNICALL Java_jogamp_nativewindow_jawt_macosx_MacOSXJAWTWindow
 JNIEXPORT jboolean JNICALL Java_jogamp_nativewindow_jawt_macosx_MacOSXJAWTWindow_UnsetJAWTRootSurfaceLayer0
   (JNIEnv *env, jclass unused, jobject jawtDrawingSurfaceInfoBuffer, jlong caLayer)
 {
-    JNF_COCOA_ENTER(env);
+    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
     JAWT_DrawingSurfaceInfo* dsi = (JAWT_DrawingSurfaceInfo*) (*env)->GetDirectBufferAddress(env, jawtDrawingSurfaceInfoBuffer);
     if (NULL == dsi) {
         NativewindowCommon_throwNewRuntimeException(env, "Argument \"jawtDrawingSurfaceInfoBuffer\" was not a direct buffer");
         return JNI_FALSE;
     }
-    CALayer* layer = (CALayer*) (intptr_t) caLayer;
+    MyCALayer* layer = (MyCALayer*) (intptr_t) caLayer;
     id <JAWT_SurfaceLayers> surfaceLayers = (id <JAWT_SurfaceLayers>)dsi->platformInfo;
     if(layer != surfaceLayers.layer) {
         NativewindowCommon_throwNewRuntimeException(env, "Attached layer %p doesn't match given layer %p\n", surfaceLayers.layer, layer);
         return JNI_FALSE;
     }
     DBG_PRINT("CALayer::UnsetJAWTRootSurfaceLayer.0: root %p (refcnt %d) -> nil\n", layer, (int)[layer retainCount]);
+    [layer release]; // Pairs w/ Set
     surfaceLayers.layer = NULL;
-    [layer release]; // Var.A
+    [pool release];
     DBG_PRINT("CALayer::UnsetJAWTRootSurfaceLayer.X: root %p (refcnt %d) -> nil\n", layer, (int)[layer retainCount]);
-    JNF_COCOA_EXIT(env);
     return JNI_TRUE;
 }
 
diff --git a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
index 89a749c51..6fc5a46ce 100644
--- a/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
+++ b/src/newt/classes/com/jogamp/newt/awt/NewtCanvasAWT.java
@@ -397,11 +397,12 @@ public class NewtCanvasAWT extends java.awt.Canvas implements WindowClosingProto
         if(DEBUG) {
             System.err.println("NewtCanvasAWT.removeNotify: "+newtChild+", from "+cont);
         }
+        // Detach OLS early..
         final OffscreenLayerSurface ols = NativeWindowFactory.getOffscreenLayerSurface(newtChild, true);
         if(null != ols && ols.isSurfaceLayerAttached()) {
             ols.detachSurfaceLayer();
-        }      
-        reparentWindow(false, cont);
+        }    
+        reparentWindow(false, cont); // will destroy context (offscreen -> onscreen) and implicit detachSurfaceLayer (if still attached)
         
         if(null != jawtWindow) {
             NewtFactoryAWT.destroyNativeWindow(jawtWindow);
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer01GLCanvasAWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer01GLCanvasAWT.java
index 90407166f..8cc094276 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer01GLCanvasAWT.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer01GLCanvasAWT.java
@@ -33,9 +33,7 @@ import java.awt.Button;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Frame;
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.lang.reflect.InvocationTargetException;
 
 import javax.media.opengl.GLAnimatorControl;
@@ -70,6 +68,7 @@ public class TestOffscreenLayer01GLCanvasAWT extends UITestCase {
     static Dimension frameSize1;
     static Dimension preferredGLSize;
     static long durationPerTest = 1000;
+    static boolean waitForKey = false;
 
     @BeforeClass
     public static void initClass() {
@@ -189,7 +188,10 @@ public class TestOffscreenLayer01GLCanvasAWT extends UITestCase {
         
         Thread.sleep(durationPerTest/2);
         
-        end(animator1, frame1, null);        
+        end(animator1, frame1, null);  
+        if( waitForKey ) {
+            UITestCase.waitForKey("Continue");
+        }
     }
     
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
@@ -214,7 +216,6 @@ public class TestOffscreenLayer01GLCanvasAWT extends UITestCase {
     }
 
     public static void main(String args[]) throws IOException {
-        boolean waitForKey = false;
         for(int i=0; i<args.length; i++) {
             if(args[i].equals("-time")) {
                 durationPerTest = atoi(args[++i]);
@@ -234,11 +235,7 @@ public class TestOffscreenLayer01GLCanvasAWT extends UITestCase {
             }
         }
         if(waitForKey) {
-            BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
-            System.err.println("Press enter to continue");
-            try {
-                System.err.println(stdin.readLine());
-            } catch (IOException e) { }
+            UITestCase.waitForKey("Start");
         }
         String tstname = TestOffscreenLayer01GLCanvasAWT.class.getName();
         /*
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer02NewtCanvasAWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer02NewtCanvasAWT.java
index e4a3bce71..2236f4b05 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer02NewtCanvasAWT.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestOffscreenLayer02NewtCanvasAWT.java
@@ -33,9 +33,7 @@ import java.awt.Button;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Frame;
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.lang.reflect.InvocationTargetException;
 
 import javax.media.opengl.GLAnimatorControl;
@@ -70,6 +68,7 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
     static Dimension frameSize1;
     static Dimension preferredGLSize;
     static long durationPerTest = 1000;
+    static boolean waitForKey = false;
 
     @BeforeClass
     public static void initClass() {
@@ -79,7 +78,6 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
     }
 
     private void setupFrameAndShow(final Frame f, java.awt.Component comp) throws InterruptedException, InvocationTargetException {
-        
         Container c = new Container();
         c.setLayout(new BorderLayout());
         c.add(new Button("north"), BorderLayout.NORTH);
@@ -169,7 +167,7 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
         Assert.assertEquals(true, AWTRobotUtil.waitForVisible(glWindow1, true));
         Assert.assertEquals(newtCanvasAWT1.getNativeWindow(),glWindow1.getParent());
         Assert.assertEquals(true, newtCanvasAWT1.isOffscreenLayerSurfaceEnabled());
-
+        
         GLAnimatorControl animator1 = new Animator(glWindow1);
         if(!noAnimation) {
             animator1.start();
@@ -187,6 +185,9 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
         Thread.sleep(durationPerTest/2);
         
         end(animator1, frame1, glWindow1);
+        if( waitForKey ) {
+            UITestCase.waitForKey("Continue");
+        }
     }
 
     public static void setDemoFields(GLEventListener demo, GLWindow glWindow, boolean debug) {
@@ -211,7 +212,6 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
     }
 
     public static void main(String args[]) throws IOException {
-        boolean waitForKey = false;
         for(int i=0; i<args.length; i++) {
             if(args[i].equals("-time")) {
                 durationPerTest = atoi(args[++i]);
@@ -231,11 +231,7 @@ public class TestOffscreenLayer02NewtCanvasAWT extends UITestCase {
             }
         }
         if(waitForKey) {
-            BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
-            System.err.println("Press enter to continue");
-            try {
-                System.err.println(stdin.readLine());
-            } catch (IOException e) { }
+            UITestCase.waitForKey("Start");
         }
         String tstname = TestOffscreenLayer02NewtCanvasAWT.class.getName();
         /*
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove01SwingAWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove01SwingAWT.java
index 76bb6362f..5e879d7ed 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove01SwingAWT.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove01SwingAWT.java
@@ -1,5 +1,5 @@
 /**
- * Copyright 2010 JogAmp Community. All rights reserved.
+ * Copyright 2013 JogAmp Community. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification, are
  * permitted provided that the following conditions are met:
@@ -33,9 +33,7 @@ import java.awt.BorderLayout;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.lang.reflect.InvocationTargetException;
 
 import javax.media.opengl.GLCapabilities;
@@ -106,21 +104,11 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
                 public void run() {
                     jPanel[0] = new JPanel();
                     jPanel[0].setLayout(new BorderLayout());
-                    // jPanel[0].add(glcContainer[0], BorderLayout.CENTER);
-                    
-                    // final Container container2 = new Container();
-                    // container2.setLayout(new BorderLayout());
-                    // container2.add(jPanel1, BorderLayout.CENTER);
-            
-                    final JPanel jPanel2 = new JPanel();
-                    jPanel2.setLayout(new BorderLayout());
-                    // jPanel2.add(container2, BorderLayout.CENTER);
-                    jPanel2.add(jPanel[0], BorderLayout.CENTER);
-                    
+
                     final JFrame jFrame1 = new JFrame("JFrame #"+num);
                     // jFrame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                     jFrame1.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); // equivalent to Frame, use windowClosing event!
-                    jFrame1.getContentPane().add(jPanel2);
+                    jFrame1.getContentPane().add(jPanel[0]);
                     jFrame1.setSize(width, height);
                     
                     top[0] = jFrame1;
@@ -137,14 +125,6 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
                 } } );
     }
     
-    protected void remove(final Container cont, final Component comp) 
-            throws InterruptedException, InvocationTargetException 
-    {
-        SwingUtilities.invokeAndWait(new Runnable() {
-                public void run() {
-                    cont.remove(comp);                    
-                } } );
-    }
     protected void dispose(final GLCanvas glc) 
             throws InterruptedException, InvocationTargetException 
     {
@@ -176,20 +156,17 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
             throws AWTException, InterruptedException, InvocationTargetException
     {
 
-        // final JFrame[] parkingFrame = new JFrame[] { null };
-        // final JPanel parkingPanel = createParkingSlot(parkingFrame, 2, 2);
-        
         for(int i=0; i<addRemoveOpCount; i++) {
             final GLCanvas glc = new GLCanvas(caps);
             Assert.assertNotNull(glc);
+            if(shallUseOffscreenFBOLayer || shallUseOffscreenPBufferLayer) {
+                glc.setShallUseOffscreenLayer(true);
+            }
             Dimension glc_sz = new Dimension(width, height);
             glc.setMinimumSize(glc_sz);
             glc.setPreferredSize(glc_sz);
             glc.setSize(glc_sz);
             glc.addGLEventListener(new Gears());
-            glc.setAutoSwapBufferMode(false);
-            // add(parkingPanel, glc);
-            // remove(parkingPanel, glc);
             
             final JFrame[] top = new JFrame[] { null };
             final Container glcCont = create(top, width, height, i);
@@ -200,15 +177,13 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
             final long t0 = System.currentTimeMillis();
             do {
                 glc.display();
-                glc.swapBuffers();
                 Thread.sleep(10);
             } while ( ( System.currentTimeMillis() - t0 ) < durationPerTest ) ;
             
             System.err.println("GLCanvas isOffscreenLayerSurfaceEnabled: "+glc.isOffscreenLayerSurfaceEnabled()+": "+glc.getChosenGLCapabilities());
             
-            // glc.destroy();
             dispose(top[0]);            
-        }        
+        }
     }
 
     @Test
@@ -216,11 +191,9 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
             throws AWTException, InterruptedException, InvocationTargetException
     {
         GLCapabilities caps = new GLCapabilities(GLProfile.getDefault());
-        if(shallUseOffscreenFBOLayer) {
-            caps.setOnscreen(false);
-        }
         if(shallUseOffscreenPBufferLayer) {
             caps.setPBuffer(true);
+            caps.setOnscreen(true); // simulate normal behavior ..
         }
         runTestGL(caps, addRemoveCount);
     }
@@ -230,7 +203,7 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
             if(args[i].equals("-time")) {
                 i++;
                 try {
-                    durationPerTest = Integer.parseInt(args[i]);
+                    durationPerTest = Long.parseLong(args[i]);
                 } catch (Exception ex) { ex.printStackTrace(); }
             } else if(args[i].equals("-loops")) {
                 i++;
@@ -245,12 +218,14 @@ public class TestGLCanvasAddRemove01SwingAWT extends UITestCase {
                 waitForKey = true;
             }            
         }
+        System.err.println("waitForKey                    "+waitForKey);
+        
+        System.err.println("addRemoveCount                "+addRemoveCount);
+        
         System.err.println("shallUseOffscreenFBOLayer     "+shallUseOffscreenFBOLayer);
         System.err.println("shallUseOffscreenPBufferLayer "+shallUseOffscreenPBufferLayer);
         if(waitForKey) {
-            BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
-            System.err.println("Press enter to continue");
-            System.err.println(stdin.readLine());
+            UITestCase.waitForKey("Start");
         }
         org.junit.runner.JUnitCore.main(TestGLCanvasAddRemove01SwingAWT.class.getName());
     }
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove02NewtCanvasAWT.java b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove02NewtCanvasAWT.java
new file mode 100644
index 000000000..3f9d677f9
--- /dev/null
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/awt/TestGLCanvasAddRemove02NewtCanvasAWT.java
@@ -0,0 +1,238 @@
+/**
+ * Copyright 2013 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ * 
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ * 
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+ 
+package com.jogamp.opengl.test.junit.jogl.awt;
+
+import java.awt.AWTException;
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+
+import javax.media.opengl.GLCapabilities;
+import javax.media.opengl.GLProfile;
+import javax.media.opengl.awt.GLCanvas;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
+
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.jogamp.newt.awt.NewtCanvasAWT;
+import com.jogamp.newt.opengl.GLWindow;
+import com.jogamp.opengl.test.junit.jogl.demos.gl2.Gears;
+import com.jogamp.opengl.test.junit.util.UITestCase;
+
+public class TestGLCanvasAddRemove02NewtCanvasAWT extends UITestCase {
+    static long durationPerTest = 50;
+    static int addRemoveCount = 15;
+    static boolean shallUseOffscreenFBOLayer = false;
+    static boolean shallUseOffscreenPBufferLayer = false;
+    static GLProfile glp;
+    static int width, height;
+    static boolean waitForKey = false;
+
+    @BeforeClass
+    public static void initClass() {
+        if(GLProfile.isAvailable(GLProfile.GL2)) {
+            glp = GLProfile.get(GLProfile.GL2);
+            Assert.assertNotNull(glp);
+            width  = 640;
+            height = 480;
+        } else {
+            setTestSupported(false);
+        }
+    }
+
+    @AfterClass
+    public static void releaseClass() {
+    }
+    
+    protected JPanel createParkingSlot(final JFrame[] top, final int width, final int height) 
+            throws InterruptedException, InvocationTargetException 
+    {
+        final JPanel[] jPanel = new JPanel[] { null };
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    jPanel[0] = new JPanel();
+                    jPanel[0].setLayout(new BorderLayout());
+            
+                    final JFrame jFrame1 = new JFrame("Parking Slot");
+                    // jFrame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                    jFrame1.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); // equivalent to Frame, use windowClosing event!
+                    jFrame1.getContentPane().add(jPanel[0]);
+                    jFrame1.setSize(width, height);
+                    
+                    top[0] = jFrame1;
+                } } );
+        return jPanel[0];        
+    }
+    
+    protected JPanel create(final JFrame[] top, final int width, final int height, final int num) 
+            throws InterruptedException, InvocationTargetException 
+    {
+        final JPanel[] jPanel = new JPanel[] { null };
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    jPanel[0] = new JPanel();
+                    jPanel[0].setLayout(new BorderLayout());
+                    
+                    final JFrame jFrame1 = new JFrame("JFrame #"+num);
+                    // jFrame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                    jFrame1.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); // equivalent to Frame, use windowClosing event!
+                    jFrame1.getContentPane().add(jPanel[0]);
+                    jFrame1.setSize(width, height);
+                    
+                    top[0] = jFrame1;
+                } } );
+        return jPanel[0];        
+    }
+
+    protected void add(final Container cont, final Component comp) 
+            throws InterruptedException, InvocationTargetException 
+    {
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    cont.add(comp, BorderLayout.CENTER);                    
+                } } );
+    }
+    
+    protected void dispose(final GLCanvas glc) 
+            throws InterruptedException, InvocationTargetException 
+    {
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    glc.destroy();                    
+                } } );
+    }
+    
+    protected void setVisible(final JFrame jFrame, final boolean visible) throws InterruptedException, InvocationTargetException {
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    if( visible ) {
+                        jFrame.validate();
+                        jFrame.pack();
+                    }
+                    jFrame.setVisible(visible);
+                } } ) ;        
+    }
+    
+    protected void dispose(final JFrame jFrame) throws InterruptedException, InvocationTargetException {
+        SwingUtilities.invokeAndWait(new Runnable() {
+                public void run() {
+                    jFrame.dispose();
+                } } ) ;        
+    }
+    
+    protected void runTestGL(GLCapabilities caps, int addRemoveOpCount)
+            throws AWTException, InterruptedException, InvocationTargetException
+    {
+
+        for(int i=0; i<addRemoveOpCount; i++) {
+            final GLWindow glw = GLWindow.create(caps);
+            
+            final NewtCanvasAWT glc = new NewtCanvasAWT(glw);
+            Assert.assertNotNull(glc);
+            if(shallUseOffscreenFBOLayer || shallUseOffscreenPBufferLayer) {
+                glc.setShallUseOffscreenLayer(true);
+            }
+            Dimension glc_sz = new Dimension(width, height);
+            glc.setMinimumSize(glc_sz);
+            glc.setPreferredSize(glc_sz);
+            glc.setSize(glc_sz);
+            glw.addGLEventListener(new Gears());
+            
+            final JFrame[] top = new JFrame[] { null };
+            final Container glcCont = create(top, width, height, i);
+            add(glcCont, glc);
+            
+            setVisible(top[0], true);
+                        
+            final long t0 = System.currentTimeMillis();
+            do {
+                glw.display();
+                Thread.sleep(10);
+            } while ( ( System.currentTimeMillis() - t0 ) < durationPerTest ) ;
+            
+            System.err.println("GLCanvas isOffscreenLayerSurfaceEnabled: "+glc.isOffscreenLayerSurfaceEnabled()+": "+glw.getChosenGLCapabilities());
+            
+            dispose(top[0]);
+            glw.destroy();
+        }
+    }
+
+    @Test
+    public void test01()
+            throws AWTException, InterruptedException, InvocationTargetException
+    {
+        GLCapabilities caps = new GLCapabilities(GLProfile.getDefault());
+        if(shallUseOffscreenPBufferLayer) {
+            caps.setPBuffer(true);
+            caps.setOnscreen(true); // get native NEWT Window, not OffscreenWindow
+        }
+        
+        runTestGL(caps, addRemoveCount);
+    }
+
+    public static void main(String args[]) throws IOException {
+        for(int i=0; i<args.length; i++) {
+            if(args[i].equals("-time")) {
+                i++;
+                try {
+                    durationPerTest = Long.parseLong(args[i]);
+                } catch (Exception ex) { ex.printStackTrace(); }
+            } else if(args[i].equals("-loops")) {
+                i++;
+                try {
+                    addRemoveCount = Integer.parseInt(args[i]);
+                } catch (Exception ex) { ex.printStackTrace(); }
+            } else if(args[i].equals("-layeredFBO")) {
+                shallUseOffscreenFBOLayer = true;
+            } else if(args[i].equals("-layeredPBuffer")) {
+                shallUseOffscreenPBufferLayer = true;
+            } else if(args[i].equals("-wait")) {
+                waitForKey = true;
+            }            
+        }
+        System.err.println("waitForKey                    "+waitForKey);
+        
+        System.err.println("addRemoveCount                "+addRemoveCount);
+        
+        System.err.println("shallUseOffscreenFBOLayer     "+shallUseOffscreenFBOLayer);
+        System.err.println("shallUseOffscreenPBufferLayer "+shallUseOffscreenPBufferLayer);
+        if(waitForKey) {
+            UITestCase.waitForKey("Start");
+        }
+        org.junit.runner.JUnitCore.main(TestGLCanvasAddRemove02NewtCanvasAWT.class.getName());
+    }
+}
diff --git a/src/test/com/jogamp/opengl/test/junit/util/UITestCase.java b/src/test/com/jogamp/opengl/test/junit/util/UITestCase.java
index b028df377..44e2eeda7 100644
--- a/src/test/com/jogamp/opengl/test/junit/util/UITestCase.java
+++ b/src/test/com/jogamp/opengl/test/junit/util/UITestCase.java
@@ -28,7 +28,10 @@
  
 package com.jogamp.opengl.test.junit.util;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
 import java.util.Iterator;
 import java.util.List;
 
@@ -141,6 +144,14 @@ public abstract class UITestCase {
         System.err.println("++++ UITestCase.tearDown: "+getFullTestName(" - "));
     }
     
+    public static void waitForKey(String preMessage) {
+        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
+        System.err.println(preMessage+"> Press enter to continue");
+        try {
+            System.err.println(stdin.readLine());
+        } catch (IOException e) { }
+    }
+    
     static final String unsupportedTestMsg = "Test not supported on this platform.";
 
     public String getSnapshotFilename(int sn, String postSNDetail, GLCapabilitiesImmutable caps, int width, int height, boolean sinkHasAlpha, String fileSuffix, String destPath) {