I had also a problem with installing UML for my NetBeans 6.8. Most of solutions proposed in the Web doesn't seem to work. Today I have finally find how to install UML plugin on NetBeans 6.8.
Step by step explanation of the process of installation of the plugin:
- Go to
http://dlc.sun.com.edgesuite.net/netbeans/updates/6.7.1/uc/final/beta/modules/uml6/
and download all .nbm files from there.
- Open NetBeans and go to Tools->Plugins->Downloaded
- Click on Add plugins… button
- Select all .nbm files you have downloaded from the source mentioned above.
- Follow step by step wizard of NetBeans to install plugins
Hope that helps you also. As for me I am enjoying UML in NetBeans starting from today.
Good luck.