--- old/src/macosx/classes/sun/java2d/opengl/CGLLayer.java	2012-02-29 16:21:42.194090800 +0400
+++ new/src/macosx/classes/sun/java2d/opengl/CGLLayer.java	2012-02-29 16:21:41.816069100 +0400
@@ -37,7 +37,7 @@
 import java.awt.GraphicsConfiguration;
 import java.awt.Transparency;
 
-public class CGLLayer extends CFRetainedResource {
+public final class CGLLayer extends CFRetainedResource {
 
     private native long nativeCreateLayer();
 
@@ -118,6 +118,7 @@
         // break the connection between the layer and the buffer
         validate(null);
         super.dispose();
+        peer = null;
     }
 
     // ----------------------------------------------------------------------