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See http://mdr.netbeans.org/servlets/ReadMsg?list=users&msgNo=3541 for details. The fix is easy (delete the createXXX methods and leave only the addXXX methods).
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.