com.sun.jdi.VMDisconnectedException: connection is closed
	at com.sun.tools.jdi.TargetVM.send(TargetVM.java:274)
	at com.sun.tools.jdi.VirtualMachineImpl.sendToTarget(VirtualMachineImpl.java:934)
	at com.sun.tools.jdi.PacketStream.send(PacketStream.java:41)
	at com.sun.tools.jdi.JDWP$ThreadReference$Status.enqueueCommand(JDWP.java:4752)
	at com.sun.tools.jdi.JDWP$ThreadReference$Status.process(JDWP.java:4738)
	at com.sun.tools.jdi.ThreadReferenceImpl.jdwpStatus(ThreadReferenceImpl.java:184)
	at com.sun.tools.jdi.ThreadReferenceImpl.isSuspended(ThreadReferenceImpl.java:200)
	at org.netbeans.modules.debugger.jpda.models.JPDAThreadImpl.<init>(JPDAThreadImpl.java:113)
	at org.netbeans.modules.debugger.jpda.models.ObjectTranslation.createTranslation(ObjectTranslation.java:102)
	at org.netbeans.modules.debugger.jpda.models.ObjectTranslation.translate(ObjectTranslation.java:172)
	at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.getThread(JPDADebuggerImpl.java:1343)
	at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.getAllThreads(JPDADebuggerImpl.java:1324)
	at org.netbeans.modules.debugger.jpda.ThreadsCollectorImpl.getAllThreads(ThreadsCollectorImpl.java:76)
	at org.netbeans.modules.debugger.jpda.ui.models.DebuggingTreeModel.computeChildren(DebuggingTreeModel.java:128)
	at org.netbeans.modules.debugger.jpda.ui.models.CachedChildrenTreeModel.recomputeChildren(CachedChildrenTreeModel.java:122)
	at org.netbeans.modules.debugger.jpda.ui.models.CachedChildrenTreeModel.recomputeChildren(CachedChildrenTreeModel.java:113)
	at org.netbeans.modules.debugger.jpda.ui.models.DebuggingTreeModel.fireNodeChanged(DebuggingTreeModel.java:278)
	at org.netbeans.modules.debugger.jpda.ui.models.DebuggingTreeModel$DebuggingPreferenceChangeListener.preferenceChange(DebuggingTreeModel.java:652)
	at sun.reflect.GeneratedMethodAccessor78.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:449)
	at $Proxy8.preferenceChange(Unknown Source)
[catch] at java.util.prefs.AbstractPreferences$EventDispatchThread.run(AbstractPreferences.java:1470)