SUGGESTED FIX

------- Component.java -------
*** /tmp/sccs.CRayyO	Thu Sep  1 14:31:34 2005
--- Component.java	Thu Sep  1 14:30:55 2005
***************
*** 48,59 ****
  import java.awt.GraphicsConfiguration;
  import java.security.AccessController;
  import java.security.PrivilegedAction;
  import javax.accessibility.*;
  import java.lang.ref.*;
- 
  import java.util.logging.*;
  
  import sun.security.action.GetPropertyAction;
  import sun.awt.AppContext;
  import sun.awt.SunToolkit;
  import sun.awt.ConstrainableGraphics;
--- 48,59 ----
  import java.awt.GraphicsConfiguration;
  import java.security.AccessController;
  import java.security.PrivilegedAction;
  import javax.accessibility.*;
  import java.lang.ref.*;
  import java.util.logging.*;
+ import java.applet.Applet;
  
  import sun.security.action.GetPropertyAction;
  import sun.awt.AppContext;
  import sun.awt.SunToolkit;
  import sun.awt.ConstrainableGraphics;
***************
*** 61,70 ****
--- 61,71 ----
  import sun.awt.SubRegionShowable;
  import sun.awt.WindowClosingListener;
  import sun.awt.WindowClosingSupport;
  import sun.awt.GlobalCursorManager;
  import sun.awt.CausedFocusEvent;
+ import sun.awt.EmbeddedFrame;
  import sun.awt.dnd.SunDropTargetEvent;
  import sun.awt.im.CompositionArea;
  import sun.java2d.SunGraphics2D;
  
  /**
***************
*** 7181,7191 ****
      public void nextFocus() {
          nextFocusHelper();
      }
  
      boolean nextFocusHelper() {
! 	return postNextFocusHelper(preNextFocusHelper());
      }
  
      Component preNextFocusHelper() {
  	Container rootAncestor = getFocusCycleRootAncestor();
          Component comp = this;
--- 7182,7196 ----
      public void nextFocus() {
          nextFocusHelper();
      }
  
      boolean nextFocusHelper() {
!         Component toFocus = preNextFocusHelper();
!         if (isFocusOwner() && toFocus == this) {
!             return false;
!         }
! 	return postNextFocusHelper(toFocus);
      }
  
      Component preNextFocusHelper() {
  	Container rootAncestor = getFocusCycleRootAncestor();
          Component comp = this;
***************
*** 7202,7211 ****
--- 7207,7222 ----
                  rootAncestor.getFocusTraversalPolicy();
              Component toFocus = policy.getComponentAfter(rootAncestor, comp);
              if (toFocus == null) {
                  toFocus = policy.getDefaultComponent(rootAncestor);
              }
+             if (toFocus == null) {
+                 Applet applet = EmbeddedFrame.getAppletIfAncestorOf(this);
+                 if (applet != null) {
+                     toFocus = applet;
+                 }
+             }
  	    return toFocus;
  	}
  	return null;
      }
  

------- EmbeddedFrame.java -------
*** /tmp/sccs.r9ayGO	Thu Sep  1 14:31:35 2005
--- EmbeddedFrame.java	Thu Sep  1 14:27:57 2005
***************
*** 19,28 ****
--- 19,30 ----
  import java.lang.reflect.Field;
  import java.beans.PropertyChangeListener;
  import java.beans.PropertyChangeEvent;
  import java.util.Set;
  import java.awt.AWTKeyStroke;
+ import java.applet.Applet;
+ import sun.applet.AppletPanel;
  
  /**
   * A generic container used for embedding Java components, usually applets.
   * An EmbeddedFrame has two related uses:
   *
***************
*** 487,496 ****
--- 489,517 ----
      public void toBack() {}
  
      public abstract void registerAccelerator(AWTKeyStroke stroke);
      public abstract void unregisterAccelerator(AWTKeyStroke stroke);
  
+     /*
+      * Checks if the component is in an EmbeddedFrame. If so,
+      * returns the applet found in the hierarchy or null if
+      * not found.
+      * @return the parent applet or {@ null} 
+      * @since JDK1.6
+      */
+     public static Applet getAppletIfAncestorOf(Component comp) {
+         Container parent = comp.getParent();
+         Applet applet = null;
+         while (parent != null && !(parent instanceof EmbeddedFrame)) {
+             if (parent instanceof Applet) {
+                 applet = (Applet)parent;
+             }
+             parent = parent.getParent();
+         }
+         return parent == null ? null : applet;
+     }
+ 
      private static class NullEmbeddedFramePeer
          extends NullComponentPeer implements FramePeer {
          public void setTitle(String title) {}
          public void setIconImage(Image im) {}
          public void setMenuBar(MenuBar mb) {}
                                     

EVALUATION

Name: osR10079			Date: 05/23/2004

The cause of the problem is that Applet itself doesn't get focus (with beta1 
embedded frame receives focus instead).  The applet works fine when I add 
setFocusable(true) in its ctor or init().  I think this is known imcompatibility
introduced by focus rearchitecture (made in 1.4), although we need to verify if 
the problem is reproducible with 1.4.
###@###.### 2004-05-24
======================================================================

Name: ssR10077			Date: 05/24/2004


Probem is reproducible with JDK1.4.2
###@###.### 2004-05-24

======================================================================
3D Blox game applet on javaonthebrain.com exhibit similar focus issue discussed
in 5051558.  Please see this bug report for evaluation.

###@###.### 2004-06-22

When user clicks "Play" button in the applet all the buttons disappear
and focus apparently goes to the embedded frame whereas before focus
rearchitecture it went to the canvas.
###@###.### 2005-07-01 08:14:23 GMT