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If you are running NetBeans 6.0 in Vista you may have problems with plugin installation via NetBeans Plugin Manager (122186). For instance you get the exception Warning - could not install some modules. The solution is to turn off 'User Account Control'.

In general, on Vista, 'User Account Control' should be turned off during the initial install of NetBeans and any time you wish to run the Plugin Manager.

If you had tried updating while 'UAC' was turned on, such an erroneous update may have corrupted the NetBeans installation. In this case:

1. Delete the netbeans userdir and ~/.netbeans-derby directory.
2. Turn Off User Account Control
3. Perform a complete uninstall followed by a reinstall.
4. Perform the plugin-download-and-install again via the Plugin Manager.

Note: Step 3 above may not be necessary if all the modules of interest do not update themselves globally (i.e in the installation directory). But the above set of steps is the only sure-fire way to solve this problem.

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See http://www.netbeans.org/issues/show_bug.cgi?id=127174

http://www.netbeans.org/servlets/BrowseList?list=nbusers&by=thread&from=825880

http://www.nabble.com/Re%3A-Exceptiong-installingUML-plugin-again.-p14581460.html