The URL to the User Guide that is pointed to in the help menu in JConsole is now broken:

http://download.java.net/jdk6/docs/technotes/guides/management/jconsole.html
should be
http://download.java.net/jdk6/docs/technotes/guides/management/MonitoringGuide/toc.html

Once Mustang ships, this will be:
http://java.sun.com/javase/6/docs/technotes/guides/management/MonitoringGuide/toc.html

This was caused by the recent unification of all the separate Monitoring and Management docs into a single volume.

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