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The build process not like '$' in a windows username. That is, a windows username such as "Test$User" does not play nicely when trying to generate a WAR file to be saved to the harddisk, through the NetBeans menu options. Recreation of this issue is simple... if more info is needed, please let me know.
What exact error does it lead to? Problem is likely shared by all projects. Not P1 - easy to workaround; first report of this problem in 6 years.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss