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After restarting IDE there was infinite Scanning Project Classpath loop - after a while java.lang.StackOverflowError exception was thrown.
Created attachment 30637 [details] mentioned exception
I am closing all reports in category Java/Unsupported as wontfix. These should be dead issues --- if the reported cases are against some live part of the NetBeans IDE please reopen and we can discuss to which category they belong.