J2SE Version (please include all output from java -version flag):
  java version "1.6.0-ea"
  Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b46)
  Java HotSpot(TM) Client VM (build 1.6.0-ea-b46, mixed mode, sharing)

Does this problem occur on J2SE 1.4.x or 5.0.x ?  Yes / No (pick one)
  No

Operating System Configuration Information (be specific):
  Microsoft Windows 2000 [Version 5.00.2195]

Hardware Configuration Information (be specific):
  Desktop

Bug Description:
  Regression: Uncaught Exception Handling is no longer working

  In 1.5 the code below would display:
  Unhandled Exception due to Thread[AWT-EventQueue-0,6,main] throwing 
  java.lang.RuntimeException: Test Exception
  **************** start stack trace *****************
  **************** end of stack trace ****************
  java.lang.ThreadGroup[name=main,maxpri=10]
    Thread[AWT-Shutdown,5,main]
    Thread[AWT-Windows,6,main]
    Thread[AWT-EventQueue-0,6,main]
    Thread[DestroyJavaVM,5,main]

  In 1.6 this is no longer working which makes it very difficult to track 
  down Sun Bugs.
  Instead strange things just start going wrong everywhere.

Steps to Reproduce (be specific):
  run the following code:

import javax.swing.*;

public class Test {
  public static void main(String[] args) {
    Thread.setDefaultUncaughtExceptionHandler(new 
Thread.UncaughtExceptionHandler() {
      public void uncaughtException(Thread t, Throwable e) {
        System.out.println("Unhandled Exception due to " + t + " 
throwing " + e);
        System.out.println("**************** start stack trace 
*****************");
        e.printStackTrace();
        System.out.println("**************** end of stack trace 
****************");
        t.getThreadGroup().list();
      }
    });
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        throw new RuntimeException("Test Exception");
      }
    });
  }
}