jdk1.6.0-rc b90, snv 43, vermillion 44

steps:
1. enable AT
2. start FileChooser demo
3. click Show FileChooser button
4. click any file on in the FileChooser
5. click Open button to close the File Chooser
6. click Show FileChooser button again

expected result:
The file chooser opens again
actual result:
the file chooser dose not open, and following exceptions in the terminal:
Exception in thread "AWT-EventQueue-1" java.lang.StringIndexOutOfBoundsException
: String index out of range: 20
        at java.lang.String.substring(String.java:1935)
        at org.GNOME.Accessibility.JavaBridge$1.propertyChange(JavaBridge.java:1
72)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup
port.java:276)
        at javax.accessibility.AccessibleContext.firePropertyChange(AccessibleCo
ntext.java:726)
        at javax.swing.text.JTextComponent$AccessibleJTextComponent.caretUpdate(
JTextComponent.java:2585)
        at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:3
91)
        at javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent
.java:4389)
        at javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextC
omponent.java:4411)
        at javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:782)
        at javax.swing.text.DefaultCaret.changeCaretPosition(DefaultCaret.java:1
257)
        at javax.swing.text.DefaultCaret.handleMoveDot(DefaultCaret.java:1081)
"exception" 59 lines, 4798 characters
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at javax.accessibility.AccessibleContext.firePropertyChange(AccessibleContext.java:726)
        at javax.swing.text.JTextComponent$AccessibleJTextComponent.caretUpdate(JTextComponent.java:2585)
        at javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:391)
        at javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:4389)
        at javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextComponent.java:4411)
        at javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:782) at javax.swing.text.DefaultCaret.changeCaretPosition(DefaultCaret.java:1257)
        at javax.swing.text.DefaultCaret.handleMoveDot(DefaultCaret.java:1081)
        at javax.swing.text.DefaultCaret.moveDot(DefaultCaret.java:1075)
        at javax.swing.text.DefaultCaret.moveDot(DefaultCaret.java:1043)
        at javax.swing.text.JTextComponent.moveCaretPosition(JTextComponent.java:1525)
        at javax.swing.text.JTextComponent.selectAll(JTextComponent.java:1907)
        at javax.swing.plaf.metal.MetalFileChooserUI$5.propertyChange(MetalFileChooserUI.java:765)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at java.awt.Component.firePropertyChange(Component.java:7802)
        at javax.swing.JComponent.addNotify(JComponent.java:4646)
        at java.awt.Container.addNotify(Container.java:2518)
        at javax.swing.JComponent.addNotify(JComponent.java:4645)
        at java.awt.Container.addNotify(Container.java:2518)
        at javax.swing.JComponent.addNotify(JComponent.java:4645)
        at java.awt.Container.addNotify(Container.java:2518)
        at javax.swing.JComponent.addNotify(JComponent.java:4645)
        at javax.swing.JRootPane.addNotify(JRootPane.java:730)
        at java.awt.Container.addNotify(Container.java:2518)
        at java.awt.Window.addNotify(Window.java:633)
        at java.awt.Dialog.addNotify(Dialog.java:744)
        at java.awt.Window.pack(Window.java:661)
        at javax.swing.JFileChooser.createDialog(JFileChooser.java:774)
        at javax.swing.JFileChooser.showDialog(JFileChooser.java:709)
        at FileChooserDemo.actionPerformed(FileChooserDemo.java:394)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:5999)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3240)
        at java.awt.Component.processEvent(Component.java:5764)
        at java.awt.Container.processEvent(Container.java:1984)
        at java.awt.Component.dispatchEventImpl(Component.java:4407)
        at java.awt.Container.dispatchEventImpl(Container.java:2042)
        at java.awt.Component.dispatchEvent(Component.java:4237)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4248)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3912) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3842)
        at java.awt.Container.dispatchEventImpl(Container.java:2028)