New GLProfile.ShutdownType: SHARED_ONLY / COMPLETE - Enhance/Fix Lifecycle Management

- Leave Platform, .. TempJarCache untouched.

- GLDrawableFactoryImpl*: Leave DynamicLibraryBundle(lib-binding) untouched,
  for NativeLibrary, JNILibLoaderBase (JNI libs), .. consistency.

- SHARED_ONLY: shutdown shared GLDrawableFactoryImpl* resources and NativeWindowFactory

- COMPLETE: additionally shutdown GLContext*
            Clear all cached GL/GLX proc-address and device/context mappings.

- Use new "GLProfile.shutdown(GLProfile.ShutdownType.SHARED_ONLY)" in Applets

- X11GLXDrawableFactory Shutdown: Uncomment close/destroy of shared resources.

- JAWTWindow.destroy(): Close the delegated device.
  In case it's X11 this closes the exclusive opened X11 Display.

7 files changed, 171 insertions, 92 deletions

diff --git a/src/jogl/classes/javax/media/opengl/GLDrawableFactory.java b/src/jogl/classes/javax/media/opengl/GLDrawableFactory.java
index cc71c53cf..5fff1ce02 100644
--- a/src/jogl/classes/javax/media/opengl/GLDrawableFactory.java
+++ b/src/jogl/classes/javax/media/opengl/GLDrawableFactory.java
@@ -54,6 +54,7 @@ import javax.media.nativewindow.AbstractGraphicsDevice;
 import javax.media.nativewindow.NativeSurface;
 import javax.media.nativewindow.NativeWindowFactory;
 import javax.media.nativewindow.ProxySurface;
+import javax.media.opengl.GLProfile.ShutdownType;
 
 /** <P> Provides a virtual machine- and operating system-independent
     mechanism for creating {@link GLDrawable}s. </P>
@@ -173,21 +174,21 @@ public abstract class GLDrawableFactory {
     eglFactory = tmp;
   }
 
-  protected static void shutdown() {
+  protected static void shutdown(ShutdownType shutdownType) {
     if (isInit) { // volatile: ok
       synchronized (GLDrawableFactory.class) {
           if (isInit) {
               isInit=false;
               unregisterFactoryShutdownHook();
-              shutdownImpl();
+              shutdownImpl(shutdownType);
           }
       }
     }
   }
-  private static void shutdownImpl() {
+  private static void shutdownImpl(ShutdownType shutdownType) {
     synchronized(glDrawableFactories) {
         for(int i=0; i<glDrawableFactories.size(); i++) {
-            glDrawableFactories.get(i).destroy();
+            glDrawableFactories.get(i).destroy(shutdownType);
         }
         glDrawableFactories.clear();
         
@@ -203,7 +204,7 @@ public abstract class GLDrawableFactory {
     }
     factoryShutdownHook = new Thread(new Runnable() {
         public void run() {
-            GLDrawableFactory.shutdownImpl();
+            GLDrawableFactory.shutdownImpl(GLProfile.ShutdownType.COMPLETE);
         }
     });
     AccessController.doPrivileged(new PrivilegedAction<Object>() {
@@ -238,7 +239,7 @@ public abstract class GLDrawableFactory {
   protected void enterThreadCriticalZone() {};
   protected void leaveThreadCriticalZone() {};
 
-  protected abstract void destroy();
+  protected abstract void destroy(ShutdownType shutdownType);
 
   /**
    * Retrieve the default <code>device</code> {@link AbstractGraphicsDevice#getConnection() connection},
diff --git a/src/jogl/classes/javax/media/opengl/GLProfile.java b/src/jogl/classes/javax/media/opengl/GLProfile.java
index 6591f4ae1..7f0c9b3d3 100644
--- a/src/jogl/classes/javax/media/opengl/GLProfile.java
+++ b/src/jogl/classes/javax/media/opengl/GLProfile.java
@@ -114,6 +114,10 @@ public class GLProfile {
             synchronized(GLProfile.class) {
                 if(!initialized) {
                     initialized = true;
+                    if(DEBUG) {
+                        System.err.println("GLProfile.initSingleton(firstUIActionOnProcess: "+firstUIActionOnProcess+") - thread "+Thread.currentThread().getName());
+                        Thread.dumpStack();
+                    }
                     Platform.initSingleton();
         
                     // run the whole static initialization privileged to speed up,
@@ -146,20 +150,41 @@ public class GLProfile {
         getProfileMap(device);
     }
 
+    /** 
+     * Shutdown type for {@link GLProfile#shutdown(ShutdownType)}.
+     * <p>
+     * {@link #SHARED_ONLY} For thread based resources only, suitable for eg. {@link java.applet.Applet Applet} restart.<br>
+     * {@link #COMPLETE} Everything.<br>
+     * </p>
+     */ 
+    public enum ShutdownType {
+        /* Shared thread based resources only, eg. for Applets */ 
+        SHARED_ONLY,
+        /* Everything */
+        COMPLETE;
+    }
+    
     /**
      * Manual shutdown method, may be called after your last JOGL use
      * within the running JVM.<br>
      * It releases all temporary created resources, ie issues {@link javax.media.opengl.GLDrawableFactory#shutdown()}.<br>
      * The shutdown implementation is called via the JVM shutdown hook, if not manually invoked here.<br>
-     * Invoke <code>shutdown()</code> manually is recommended, due to the unreliable JVM state within the shutdown hook.<br>
+     * Invoke <code>shutdown(type)</code> manually is recommended, due to the unreliable JVM state within the shutdown hook.<br>
+     * @param type the shutdown type, see {@link ShutdownType}.
      */
-    public static void shutdown() {
+    public static void shutdown(ShutdownType type) {
         if(initialized) { // volatile: ok
             synchronized(GLProfile.class) {
                 if(initialized) {
                     initialized = false;
-                    GLDrawableFactory.shutdown(); // may utilize static GLContext mappings
-                    GLContext.shutdown(); // does not utilize shared resources of GLDrawableFactory
+                    if(DEBUG) {
+                        System.err.println("GLProfile.shutdown(type: "+type+") - thread "+Thread.currentThread().getName());
+                        Thread.dumpStack();
+                    }                    
+                    GLDrawableFactory.shutdown(type);
+                    if(ShutdownType.COMPLETE == type) {
+                        GLContext.shutdown();
+                    }
                     NativeWindowFactory.shutdown();
                 }
             }
diff --git a/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java b/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
index 5856bf3a0..b7c90a18b 100644
--- a/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
+++ b/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
@@ -67,6 +67,8 @@ public class VersionApplet extends Applet {
   private synchronized void my_init() {
     if(null != canvas) { return; }
 
+    setEnabled(true);
+    
     GLProfile glp = GLProfile.getDefault();
     GLCapabilities glcaps = new GLCapabilities(glp);
 
@@ -120,30 +122,36 @@ public class VersionApplet extends Applet {
           remove(canvas);
           canvas.destroy();
           canvas = null;
-          remove(tareaVersion);
-          tareaVersion=null;
+          remove(tareaVersion.getParent()); // remove the grid
+          tareaVersion = null;
+          tareaCaps = null;
+          setEnabled(false);
       }
   }
 
   public void init() {
     System.err.println("VersionApplet: init() - begin");
+    GLProfile.initSingleton(false);
     my_init();
     System.err.println("VersionApplet: init() - end");
   }
 
   public void start() {
     System.err.println("VersionApplet: start() - begin");
+    canvas.setVisible(true);
     System.err.println("VersionApplet: start() - end");
   }
 
   public void stop() {
     System.err.println("VersionApplet: stop() - begin");
+    canvas.setVisible(false);
     System.err.println("VersionApplet: stop() - end");
   }
 
   public void destroy() {
     System.err.println("VersionApplet: destroy() - start");
     my_release();
+    GLProfile.shutdown(GLProfile.ShutdownType.SHARED_ONLY);
     System.err.println("VersionApplet: destroy() - end");
   }
 
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
index fe4adb564..f6988a73f 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLDrawableFactory.java
@@ -39,6 +39,7 @@ package jogamp.opengl.egl;
 import javax.media.nativewindow.*;
 import javax.media.nativewindow.egl.EGLGraphicsDevice;
 import javax.media.opengl.*;
+import javax.media.opengl.GLProfile.ShutdownType;
 
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.*;
@@ -50,6 +51,9 @@ import java.util.HashMap;
 import java.util.List;
 
 public class EGLDrawableFactory extends GLDrawableFactoryImpl {
+    private static GLDynamicLookupHelper eglES1DynamicLookupHelper = null;
+    private static GLDynamicLookupHelper eglES2DynamicLookupHelper = null;
+    
     public EGLDrawableFactory() {
         super();
         
@@ -68,55 +72,66 @@ public class EGLDrawableFactory extends GLDrawableFactoryImpl {
         // to a dynamic one, where there can be 2 instances 
         // for each ES profile with their own ProcAddressTable.
 
-        GLDynamicLookupHelper tmp=null;
-        try {
-            tmp = new GLDynamicLookupHelper(new EGLES1DynamicLibraryBundleInfo());
-        } catch (GLException gle) {
-            if(DEBUG) {
-                gle.printStackTrace();
+        synchronized(EGLDrawableFactory.class) {
+            if(null==eglES1DynamicLookupHelper) {
+                GLDynamicLookupHelper tmp=null;
+                try {
+                    tmp = new GLDynamicLookupHelper(new EGLES1DynamicLibraryBundleInfo());
+                } catch (GLException gle) {
+                    if(DEBUG) {
+                        gle.printStackTrace();
+                    }
+                }
+                eglES1DynamicLookupHelper = tmp;
+                if(null!=eglES1DynamicLookupHelper && eglES1DynamicLookupHelper.isLibComplete()) {
+                    EGL.resetProcAddressTable(eglES1DynamicLookupHelper);
+                }
             }
         }
-        eglES1DynamicLookupHelper = tmp;
-        if(null!=eglES1DynamicLookupHelper && eglES1DynamicLookupHelper.isLibComplete()) {
-            EGL.resetProcAddressTable(eglES1DynamicLookupHelper);
-        }
 
-        tmp=null;
-        try {
-            tmp = new GLDynamicLookupHelper(new EGLES2DynamicLibraryBundleInfo());
-        } catch (GLException gle) {
-            if(DEBUG) {
-                gle.printStackTrace();
+        synchronized(EGLDrawableFactory.class) {
+            if(null==eglES2DynamicLookupHelper) {
+                GLDynamicLookupHelper tmp=null;
+                try {
+                    tmp = new GLDynamicLookupHelper(new EGLES2DynamicLibraryBundleInfo());
+                } catch (GLException gle) {
+                    if(DEBUG) {
+                        gle.printStackTrace();
+                    }
+                }
+                eglES2DynamicLookupHelper = tmp;
+                if(null!=eglES2DynamicLookupHelper && eglES2DynamicLookupHelper.isLibComplete()) {
+                    EGL.resetProcAddressTable(eglES2DynamicLookupHelper);
+                }
             }
         }
-        eglES2DynamicLookupHelper = tmp;
-        if(null!=eglES2DynamicLookupHelper && eglES2DynamicLookupHelper.isLibComplete()) {
-            EGL.resetProcAddressTable(eglES2DynamicLookupHelper);
-        }
         if(null != eglES1DynamicLookupHelper || null != eglES2DynamicLookupHelper) {
             defaultDevice = new EGLGraphicsDevice(AbstractGraphicsDevice.DEFAULT_CONNECTION, AbstractGraphicsDevice.DEFAULT_UNIT);
             sharedMap = new HashMap();
         }
     }
 
-    protected final void destroy() {
+    protected final void destroy(ShutdownType shutdownType) {
         if(null != sharedMap) {
             sharedMap.clear();
             sharedMap = null;
         }
         defaultDevice = null;
-        if(null != eglES1DynamicLookupHelper) {
-            eglES1DynamicLookupHelper.destroy();
-            eglES1DynamicLookupHelper = null;
-        }
-        if(null != eglES2DynamicLookupHelper) {
-            eglES2DynamicLookupHelper.destroy();
-            eglES2DynamicLookupHelper = null;
-        }        
+        /**
+         * Pulling away the native library may cause havoc ..
+         * 
+        if(ShutdownType.COMPLETE == shutdownType) {
+            if(null != eglES1DynamicLookupHelper) {
+                eglES1DynamicLookupHelper.destroy();
+                eglES1DynamicLookupHelper = null;
+            }
+            if(null != eglES2DynamicLookupHelper) {
+                eglES2DynamicLookupHelper.destroy();
+                eglES2DynamicLookupHelper = null;
+            }
+        } */
     }
 
-    private GLDynamicLookupHelper eglES1DynamicLookupHelper;
-    private GLDynamicLookupHelper eglES2DynamicLookupHelper;
     private HashMap/*<connection, SharedResource>*/ sharedMap;
     private EGLGraphicsDevice defaultDevice;
 
diff --git a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
index 4543424a6..45445067e 100644
--- a/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/macosx/cgl/MacOSXCGLDrawableFactory.java
@@ -61,6 +61,7 @@ import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
+import javax.media.opengl.GLProfile.ShutdownType;
 
 import jogamp.nativewindow.WrappedSurface;
 import jogamp.opengl.DesktopGLDynamicLookupHelper;
@@ -72,24 +73,30 @@ import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.util.ReflectionUtil;
 
 public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
+  private static DesktopGLDynamicLookupHelper macOSXCGLDynamicLookupHelper = null;
+  
   public MacOSXCGLDrawableFactory() {
     super();
 
-    DesktopGLDynamicLookupHelper tmp = null;
-    try {
-        tmp = new DesktopGLDynamicLookupHelper(new MacOSXCGLDynamicLibraryBundleInfo());
-    } catch (GLException gle) {
-        if(DEBUG) {
-            gle.printStackTrace();
+    synchronized(MacOSXCGLDrawableFactory.class) {
+        if(null==macOSXCGLDynamicLookupHelper) {
+            DesktopGLDynamicLookupHelper tmp = null;
+            try {
+                tmp = new DesktopGLDynamicLookupHelper(new MacOSXCGLDynamicLibraryBundleInfo());
+            } catch (GLException gle) {
+                if(DEBUG) {
+                    gle.printStackTrace();
+                }
+            }
+            macOSXCGLDynamicLookupHelper = tmp;
+            /** FIXME ?? 
+            if(null!=macOSXCGLDynamicLookupHelper) {
+                CGL.getCGLProcAddressTable().reset(macOSXCGLDynamicLookupHelper);
+            } */
         }
     }
-    macOSXCGLDynamicLookupHelper = tmp;
     
     if(null!=macOSXCGLDynamicLookupHelper) {
-        /** FIXME ?? 
-        CGL.getCGLProcAddressTable().reset(macOSXCGLDynamicLookupHelper);
-        */
-        
         // Register our GraphicsConfigurationFactory implementations
         // The act of constructing them causes them to be registered
         MacOSXCGLGraphicsConfigurationFactory.registerFactory();
@@ -105,23 +112,25 @@ public class MacOSXCGLDrawableFactory extends GLDrawableFactoryImpl {
     }     
   }
 
-  protected final void destroy() {
+  protected final void destroy(ShutdownType shutdownType) {
     if(null != sharedMap) {
         sharedMap.clear();
         sharedMap = null;
     }
     defaultDevice = null;
-    if(null != macOSXCGLDynamicLookupHelper) {
+    /**
+     * Pulling away the native library may cause havoc ..
+     * 
+    if(ShutdownType.COMPLETE == shutdownType && null != macOSXCGLDynamicLookupHelper) {
         macOSXCGLDynamicLookupHelper.destroy();
         macOSXCGLDynamicLookupHelper = null;
-    }
+    } */
   }
 
   public GLDynamicLookupHelper getGLDynamicLookupHelper(int profile) {
       return macOSXCGLDynamicLookupHelper;
   }
 
-  private DesktopGLDynamicLookupHelper macOSXCGLDynamicLookupHelper;
   private HashMap<String, SharedResource> sharedMap = new HashMap<String, SharedResource>();
   private MacOSXGraphicsDevice defaultDevice;
 
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
index 8e9bf553b..917402b0a 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLDrawableFactory.java
@@ -61,6 +61,7 @@ import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
+import javax.media.opengl.GLProfile.ShutdownType;
 
 import com.jogamp.common.JogampRuntimeException;
 import com.jogamp.common.nio.PointerBuffer;
@@ -80,22 +81,29 @@ import jogamp.opengl.GLDynamicLookupHelper;
 import jogamp.opengl.SharedResourceRunner;
 
 public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
+  private static DesktopGLDynamicLookupHelper windowsWGLDynamicLookupHelper = null;
+  
   public WindowsWGLDrawableFactory() {
     super();
 
-    DesktopGLDynamicLookupHelper tmp = null;
-    try {
-        tmp = new DesktopGLDynamicLookupHelper(new WindowsWGLDynamicLibraryBundleInfo());
-    } catch (GLException gle) {
-        if(DEBUG) {
-            gle.printStackTrace();
+    synchronized(WindowsWGLDrawableFactory.class) {
+        if(null==windowsWGLDynamicLookupHelper) {
+            DesktopGLDynamicLookupHelper tmp = null;
+            try {
+                tmp = new DesktopGLDynamicLookupHelper(new WindowsWGLDynamicLibraryBundleInfo());
+            } catch (GLException gle) {
+                if(DEBUG) {
+                    gle.printStackTrace();
+                }
+            }
+            windowsWGLDynamicLookupHelper = tmp;
+            if(null!=windowsWGLDynamicLookupHelper) {
+                WGL.getWGLProcAddressTable().reset(windowsWGLDynamicLookupHelper);
+            }               
         }
     }
-    windowsWGLDynamicLookupHelper = tmp;
     
     if(null!=windowsWGLDynamicLookupHelper) {
-        WGL.getWGLProcAddressTable().reset(windowsWGLDynamicLookupHelper);
-        
         // Register our GraphicsConfigurationFactory implementations
         // The act of constructing them causes them to be registered
         WindowsWGLGraphicsConfigurationFactory.registerFactory();
@@ -119,7 +127,7 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
     }
   }
 
-  protected final void destroy() {
+  protected final void destroy(ShutdownType shutdownType) {
     if(null != sharedResourceRunner) {
         sharedResourceRunner.releaseAndWait();
         sharedResourceRunner = null;
@@ -129,12 +137,13 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
         sharedMap = null;
     }
     defaultDevice = null;
-    if(null != windowsWGLDynamicLookupHelper) {
-        // FIXME: If closing the native library NativeLibrary.close(), 
-        // reload of Applets doesn't work. Dunno why. 
-        // windowsWGLDynamicLookupHelper.destroy();
+    /**
+     * Pulling away the native library may cause havoc ..
+     * 
+    if(ShutdownType.COMPLETE == shutdownType && null != windowsWGLDynamicLookupHelper) {
+        windowsWGLDynamicLookupHelper.destroy();
         windowsWGLDynamicLookupHelper = null;
-    }
+    } */
     
     RegisteredClassFactory.shutdownSharedClasses();
   }
@@ -143,7 +152,6 @@ public class WindowsWGLDrawableFactory extends GLDrawableFactoryImpl {
       return windowsWGLDynamicLookupHelper;
   }
 
-  private DesktopGLDynamicLookupHelper windowsWGLDynamicLookupHelper;
   private WindowsGraphicsDevice defaultDevice;
   private SharedResourceImplementation sharedResourceImpl;
   private SharedResourceRunner sharedResourceRunner;
diff --git a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
index d2b9242be..96153dd27 100644
--- a/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
+++ b/src/jogl/classes/jogamp/opengl/x11/glx/X11GLXDrawableFactory.java
@@ -57,6 +57,7 @@ import javax.media.opengl.GLContext;
 import javax.media.opengl.GLDrawable;
 import javax.media.opengl.GLException;
 import javax.media.opengl.GLProfile;
+import javax.media.opengl.GLProfile.ShutdownType;
 
 import jogamp.nativewindow.WrappedSurface;
 import jogamp.nativewindow.x11.X11Lib;
@@ -78,22 +79,29 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
   public static final VersionNumber versionOneThree = new VersionNumber(1, 3, 0);
   public static final VersionNumber versionOneFour = new VersionNumber(1, 4, 0);
 
+  private static DesktopGLDynamicLookupHelper x11GLXDynamicLookupHelper = null;
+  
   public X11GLXDrawableFactory() {
     super();
 
-    DesktopGLDynamicLookupHelper tmp = null;
-    try {
-        tmp = new DesktopGLDynamicLookupHelper(new X11GLXDynamicLibraryBundleInfo());
-    } catch (GLException gle) {
-        if(DEBUG) {
-            gle.printStackTrace();
+    synchronized(X11GLXDrawableFactory.class) {
+        if(null==x11GLXDynamicLookupHelper) {
+            DesktopGLDynamicLookupHelper tmp = null;
+            try {
+                tmp = new DesktopGLDynamicLookupHelper(new X11GLXDynamicLibraryBundleInfo());
+            } catch (GLException gle) {
+                if(DEBUG) {
+                    gle.printStackTrace();
+                }
+            }
+            x11GLXDynamicLookupHelper = tmp;
+            if(null!=x11GLXDynamicLookupHelper) {
+                GLX.getGLXProcAddressTable().reset(x11GLXDynamicLookupHelper);
+            }
         }
     }
-    x11GLXDynamicLookupHelper = tmp;
     
-    if(null!=x11GLXDynamicLookupHelper) {
-        GLX.getGLXProcAddressTable().reset(x11GLXDynamicLookupHelper);
-        
+    if(null!=x11GLXDynamicLookupHelper) {        
         // Register our GraphicsConfigurationFactory implementations
         // The act of constructing them causes them to be registered
         X11GLXGraphicsConfigurationFactory.registerFactory();
@@ -111,7 +119,7 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
     }    
   }
 
-  protected final void destroy() {
+  protected final void destroy(ShutdownType shutdownType) {
     if(null != sharedResourceRunner) {
         sharedResourceRunner.releaseAndWait();
         sharedResourceRunner = null;
@@ -121,10 +129,13 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
         sharedMap = null;
     }
     defaultDevice = null;
-    if(null != x11GLXDynamicLookupHelper) {
+    /**
+     * Pulling away the native library may cause havoc ..
+     * 
+    if(ShutdownType.COMPLETE == shutdownType && null != x11GLXDynamicLookupHelper) {
         x11GLXDynamicLookupHelper.destroy();
         x11GLXDynamicLookupHelper = null;
-    }
+    } */
 
     // Don't really close pending Display connections,
     // since this may trigger a JVM exception
@@ -135,7 +146,6 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
       return x11GLXDynamicLookupHelper;
   }
 
-  private DesktopGLDynamicLookupHelper x11GLXDynamicLookupHelper;  
   private X11GraphicsDevice defaultDevice;
   private SharedResourceImplementation sharedResourceImpl;
   private SharedResourceRunner sharedResourceRunner;
@@ -273,17 +283,19 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
                 System.err.println("!!!   Screen  : " + sr.screen);
                 System.err.println("!!!   Drawable: " + sr.drawable);
                 System.err.println("!!!   CTX     : " + sr.context);
+                Thread.dumpStack();
             }
 
             if (null != sr.context) {
                 // may cause JVM SIGSEGV:
-                // sr.context.makeCurrent();
-                // sr.context.destroy();
+                sr.context.makeCurrent();
+                sr.context.destroy();
                 sr.context = null;
             }
 
             if (null != sr.drawable) {
-                // may cause JVM SIGSEGV: sr.drawable.destroy();
+                // may cause JVM SIGSEGV:
+                sr.drawable.destroy();
                 sr.drawable = null;
             }
 
@@ -292,7 +304,8 @@ public class X11GLXDrawableFactory extends GLDrawableFactoryImpl {
             }
 
             if (null != sr.device) {
-                // may cause JVM SIGSEGV: sr.device.close();
+                // may cause JVM SIGSEGV:
+                sr.device.close();
                 sr.device = null;
             }
         }