SYNOPSIS
--------
Jconsole throws NullPointerException when launched with Nimbus Look and Feel

OPERATING SYSTEM
----------------
All

FULL JDK VERSION
----------------
Reproducible with latest FCS (6u23) and latest EA (6u24-b03, 7-b124).
Not a regression (have tested back to 6u10).

DESCRIPTION
-----------
Jconsole throws a NullPointerException when launched with Nimbus Look and Feel.

CR 6612715 appears to describe the same issue, with the evaluation stating that it is fixed in 6u10. However, the problem can still be easily reproduced with the latest Java 6 releases, and JDK7.

STEPS TO REPRODUCE
------------------
Launch Jconsole with the following command:

   jconsole -J-Dswing.defaultlaf=com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel

Observe the following exception (output from 6u24):

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at sun.tools.jconsole.Utilities.getColorBrightness(Utilities.java:131)
        at sun.tools.jconsole.Utilities.ensureContrast(Utilities.java:115)
        at sun.tools.jconsole.ConnectDialog.revalidate(ConnectDialog.java:260)
        at javax.swing.JComponent.setVisible(JComponent.java:2621)
        at sun.tools.jconsole.ConnectDialog.setVisible(ConnectDialog.java:544)
        at javax.swing.JInternalFrame.<init>(JInternalFrame.java:329)
        at sun.tools.jconsole.InternalDialog.<init>(InternalDialog.java:26)
        at sun.tools.jconsole.ConnectDialog.<init>(ConnectDialog.java:64)
        at sun.tools.jconsole.JConsole.showConnectDialog(JConsole.java:602)
        at sun.tools.jconsole.JConsole.access$800(JConsole.java:36)
        at sun.tools.jconsole.JConsole$6.run(JConsole.java:815)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:642)
        at java.awt.EventQueue.access$000(EventQueue.java:85)
        at java.awt.EventQueue$1.run(EventQueue.java:603)
        at java.awt.EventQueue$1.run(EventQueue.java:601)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:612)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

WORKAROUND
----------
None, apart from not using Nimbus.