diff --git a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
index 335322b..0f05a91 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLCanvas.java
@@ -440,7 +440,14 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
 
   @Override
   public void display() {
+    if( !validateGLDrawable() ) {
+        if(DEBUG) {
+            System.err.println(getThreadName()+": Info: GLCanvas display - skipped GL render, drawable not valid yet");
+        }
+        return; // not yet available ..
+    }
     Threading.invoke(true, displayOnEDTAction, getTreeLock());
+    
     awtWindowClosingProtocol.addClosingListenerOneShot();
   }
 
@@ -570,22 +577,29 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
         if( _drawable.isRealized() ) {
             return true;
         }
-        if (!Beans.isDesignTime() &&
-             0 < _drawable.getWidth() * _drawable.getHeight() ) {
-            // make sure drawable realization happens on AWT EDT, due to AWTTree lock
-            AWTEDTExecutor.singleton.invoke(getTreeLock(), true, setRealizedOnEDTAction);
-            if( _drawable.isRealized() ) {
-                sendReshape=true; // ensure a reshape is being send ..
-                if(DEBUG) {
-                    System.err.println(getThreadName()+": Realized Drawable: "+_drawable.toString());
-                    Thread.dumpStack();
+        final RecursiveLock _lock = lock;
+        _lock.lock();
+        try {            
+            if (!Beans.isDesignTime() &&
+                 0 < _drawable.getWidth() * _drawable.getHeight() ) {
+                // make sure drawable realization happens on AWT EDT, due to AWTTree lock
+                AWTEDTExecutor.singleton.invoke(getTreeLock(), true, setRealizedOnEDTAction);
+                if( _drawable.isRealized() ) {
+                    sendReshape=true; // ensure a reshape is being send ..
+                    if(DEBUG) {
+                        System.err.println(getThreadName()+": Realized Drawable: "+_drawable.toString());
+                        Thread.dumpStack();
+                    }
+                    return true;
                 }
-                return true;
             }
+        } finally {
+            _lock.unlock();
         }
     }
     return false;
   }
+  
   private Runnable setRealizedOnEDTAction = new Runnable() {
       @Override
     public void run() {
@@ -984,11 +998,7 @@ public class GLCanvas extends Canvas implements AWTGLAutoDrawable, WindowClosing
         final RecursiveLock _lock = lock;
         _lock.lock();
         try {            
-            if( validateGLDrawable() ) {
-                helper.invokeGL(drawable, context, displayAction, initAction);
-            } else if(DEBUG) {
-                System.err.println(getThreadName()+": Info: GLCanvas display - skipped GL render, drawable not valid yet");
-            }
+            helper.invokeGL(drawable, context, displayAction, initAction);
         } finally {
             _lock.unlock();
         }