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Created attachment 147259 [details] Screenshot of file without any issue with red alert I did changes to file coded in wrong way, so there started indicating red alert icon for that file in project view and in file name in editor as well. After the file is recoded in right way, the project is build-able, the icons indicating issue are still visible.
reassigning to Java/Project for further evaluation.
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