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Proposed in: https://netbeans.org/bugzilla/show_bug.cgi?id=179749#c5 When are the annotation processors run by the background scan, their System.{err|out} should not go to the IDE's log. The output can be redirected to an InputOutput, and (most likely) sent to /dev/null.
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