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Created attachment 165268 [details] messages.log Copied old version of file over new version. Started to get Duplicate class messages. Read through duplicate class message bug report, suggested clearing cache and refactoring/renaming class. Refactoring seemed simpler, so did that, and got the null pointer exception. The messaging log shows that there's a problem with the subversion server, which is offline. Not sure if that's contributing. Loaded NetBeans 8.2, and no longer getting the duplicate class name message, so can't verify if refactoring bug has been fixed.