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After JavaSource.runWhenScanFinished() call were replaced by JavaSource.runUserActionTask() by http://hg.netbeans.org/main/rev/a3f3284ff720 the (semi-)lazy behavior is gone. Although runWhenScanFinished() returns Future, it's not truly asynchronous. It looks like runUserActionTask() calls might need to be replaced with some truly asynchronous calls.