FULL PRODUCT VERSION :
java version "1.6.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-beta2-b74)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b74, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux vino.select-tech.si 2.6.15-1.1831_FC4 #1 Tue Feb 7 13:37:42 EST 2006 i686 i686 i386 GNU/Linux


EXTRA RELEVANT SYSTEM CONFIGURATION :
not relevant

A DESCRIPTION OF THE PROBLEM :
When two JToggleButtons within the same ButtonGroup are bound to the same Action (a sublclass of AbstractAction) then an infinite recursion is triggered by pressing one of them and consequently StackOverflowError is thrown.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the source code attached and run it on the latest Mustang. Press one of the buttons. See StackOverflowError.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When the same program is compiled and run on Tiger, it works correctly.
ACTUAL -
The actual result is StackOverflowError being thrown.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at javax.swing.AbstractButton.access$100(AbstractButton.java:56)
at javax.swing.AbstractButton$Handler.stateChanged(AbstractButton.java:2293)
at javax.swing.DefaultButtonModel.fireStateChanged(DefaultButtonModel.java:323)
at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:247)
at javax.swing.ButtonGroup.setSelected(ButtonGroup.java:145)
at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:232)
at javax.swing.AbstractButton.setSelected(AbstractButton.java:329)
at javax.swing.AbstractButton.setSelectedFromAction(AbstractButton.java:1281)
at javax.swing.AbstractButton.actionPropertyChanged(AbstractButton.java:1195)
at javax.swing.AbstractButton$ButtonActionPropertyChangeListener.actionPropertyChanged(AbstractButton.java:1330)
at javax.swing.AbstractButton$ButtonActionPropertyChangeListener.actionPropertyChanged(AbstractButton.java:1319)
at javax.swing.ActionPropertyChangeListener.propertyChange(ActionPropertyChangeListener.java:71)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:338)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:75)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:275)
at javax.swing.AbstractAction.firePropertyChange(AbstractAction.java:230)
at javax.swing.AbstractAction.putValue(AbstractAction.java:165)
at javax.swing.AbstractButton$Handler.itemStateChanged(AbstractButton.java:2320)
at javax.swing.DefaultButtonModel.fireItemStateChanged(DefaultButtonModel.java:430)
at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:250)
at javax.swing.ButtonGroup.setSelected(ButtonGroup.java:147)
at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:232)
at javax.swing.AbstractButton.setSelected(AbstractButton.java:329)
at javax.swing.AbstractButton.setSelectedFromAction(AbstractButton.java:1281)
at javax.swing.AbstractButton.actionPropertyChanged(AbstractButton.java:1195)
at javax.swing.AbstractButton$ButtonActionPropertyChangeListener.actionPropertyChanged(AbstractButton.java:1330)
at javax.swing.AbstractButton$ButtonActionPropertyChangeListener.actionPropertyChanged(AbstractButton.java:1319)
at javax.swing.ActionPropertyChangeListener.propertyChange(ActionPropertyChangeListener.java:71)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:338)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:75)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:275)
... and so on...


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;

//
// this program produces StackOverflowError when run on latest Mustang builds
// but works correctly on Tiger
public class ToggleButtonTest
{
   public static void doTest()
   {
      Action action1 = new AbstractAction("Action 1")
      {
         public void actionPerformed(ActionEvent e)
         {
            System.out.println(e.getActionCommand());
         }
      };

      Action action2 = new AbstractAction("Action 2")
      {
         public void actionPerformed(ActionEvent e)
         {
            System.out.println(e.getActionCommand());
         }
      };

      ButtonGroup group = new ButtonGroup();

      JToggleButton button1 = new JToggleButton(action1);
      button1.setActionCommand("Button 1 selected");
      group.add(button1);

      // if you put action2 instead of action1 in the following line, it works on Java SE 6 too...
      JToggleButton button2 = new JToggleButton(action1);
      button2.setActionCommand("Button 2 selected");
      group.add(button2);

      JFrame f = new JFrame("ToggleButtonTest");
      f.getContentPane().setLayout(new FlowLayout());
      f.getContentPane().add(button1);
      f.getContentPane().add(button2);
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      f.pack();
      f.setVisible(true);
   }

   public static void main(String[] args)
   {
      SwingUtilities.invokeLater(new Runnable()
      {
         public void run()
         {
            doTest();
         }
      });
   }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
There might be (wrapping action with another action, filtering events, etc) but not an easy or elegant one.

Release Regression From : 5.0
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.