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"Tools-->Options-->Java Code-->Hints" allows you to add hints for various conditions, and to specify if the hints should be treated as warnings or errors. all warning/error hints should be placed in the task list and have error/warning badges placed on the files so the problems are visible even when the file isn't the active editor. additionally, hints treated as errors should prevent compilation (at least from within the IDE).
*** This issue has been marked as a duplicate of 105054 ***