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When logging annotated exceptions into messages.log, it dumps one extra stack list, ending in the internals of ErrorManager. This should be filtered out, since it is confusing when searching for the problem: SEVERE: Unexpected JDWP Error: 13 org.openide.ErrorManager$AnnException: msg at org.openide.ErrorManager$AnnException.findOrCreate(ErrorManager.java:839) at org.openide.ErrorManager$DelegatingErrorManager.annotate(ErrorManager.java:628) at org.openide.ErrorManager.annotate(ErrorManager.java:430) at org.netbeans.modules.debugger.jpda.models.JPDAThreadImpl.getContendedMonitor(JPDAThreadImpl.java:654) at org.netbeans.modules.debugger.jpda.ui.models.MonitorModel.getChildren(MonitorModel.java:114) at org.netbeans.spi.viewmodel.Models$CompoundTreeModel.getChildren(Models.java:596) at org.netbeans.spi.viewmodel.Models$CompoundModel.getChildren(Models.java:2777) at org.netbeans.modules.viewmodel.TreeModelNode$TreeModelChildren.evaluateLazily(TreeModelNode.java:644) at org.netbeans.modules.viewmodel.TreeModelNode$LazyEvaluator.run(TreeModelNode.java:1061) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:539) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:964) msg Caused: com.sun.jdi.InternalException: Unexpected JDWP Error: 13 ... See the attachment of issue #118353 for details.