This is only reproducible on Windows 7 and Vista. I have tested with UAC OFF. On XP Update Button is functioning fine.

Machine details; Remote desltop to jlab408-vm1.india.sun.com (user : admin and password : abc123)

This issue is also reproducible when ManualUpdateServletURL is set in the registry.

Set ManualUpdateServletURL
[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Update\Policy]
"ManualUpdateServletURL"="http://j2se.east.sun.com/arc/1.6.0_18/nightly/2009-10-19/windows-i586/map.xml"

How to reproduce this issue. Make sure all the JREs are uninstalled and AU2.0 is alos uninstalled.

1.) Install JRE 6u18 PIT b04
http://j2se.east/arc/1.6.0_18/pit/2009-10-23

2.) Open Java Control Panel and Goto Update tab.

3.) Clcik on Update tab

Expected Behavior
A Message dialog should be displayed stating "You already have latest JRE ...."

Actual Behavior
Error dialog is displayed stating ArrayIndexOutOfBoundsException.

java.lang.ArrayIndexOutOfBoundsException: 2
at com.sun.deploy.panel.UpdatePanel.actionPerformed(Unknown Source)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)