java.util.ConcurrentModificationException
        at java.util.IdentityHashMap$IdentityHashMapIterator.nextIndex(IdentityHashMap.java:715)
        at java.util.IdentityHashMap$KeyIterator.next(IdentityHashMap.java:804)
        at org.netbeans.modules.timers.InstanceWatcher.contains(InstanceWatcher.java:78)
        at org.netbeans.modules.timers.InstanceWatcher.add(InstanceWatcher.java:72)
        at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.add(TimesCollectorPeer.java:214)
        at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.access$000(TimesCollectorPeer.java:189)
        at org.netbeans.modules.timers.TimesCollectorPeer.reportReference(TimesCollectorPeer.java:104)
        at org.netbeans.modules.timers.Install$TimerHandler.publish(Install.java:132)
        at java.util.logging.Logger.log(Logger.java:472)
        at java.util.logging.Logger.doLog(Logger.java:494)
        at java.util.logging.Logger.log(Logger.java:558)
        at org.netbeans.api.java.source.JavaSource.createCurrentInfo(JavaSource.java:2106)
        at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:654)
        at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:607)
        at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl.getImports(EditorContextImpl.java:1403)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateIn(JPDADebuggerImpl.java:731)
        at org.netbeans.modules.debugger.jpda.breakpoints.BreakpointImpl.evaluateConditionIn(BreakpointImpl.java:677)
        at org.netbeans.modules.debugger.jpda.breakpoints.BreakpointImpl.evaluateCondition(BreakpointImpl.java:563)
        at org.netbeans.modules.debugger.jpda.breakpoints.BreakpointImpl.processCondition(BreakpointImpl.java:329)
        at org.netbeans.modules.debugger.jpda.breakpoints.LineBreakpointImpl.processCondition(LineBreakpointImpl.java:239)
        at org.netbeans.modules.debugger.jpda.util.Operator$1.run(Operator.java:208)
        at java.lang.Thread.run(Thread.java:619)