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`Thread.stop` is deprecated in favour of a periodic check of a boolean stop condition. It shouldn't be used. ``` WARNING [org.netbeans.modules.maven.indexer.OnStop]: ...hard stop required. SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor org.netbeans.modules.maven.indexer.OnStop java.lang.UnsupportedOperationException at java.lang.Thread.stop(Thread.java:872) at org.netbeans.modules.maven.indexer.OnStop.run(OnStop.java:67) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to at org.openide.util.RequestProcessor.post(RequestProcessor.java:420) at org.netbeans.core.startup.NbStartStop.startClose(NbStartStop.java:142) at org.netbeans.core.startup.NbInstaller.closeAsync(NbInstaller.java:728) at org.netbeans.ModuleManager.shutDownAsync(ModuleManager.java:2204) at org.netbeans.core.startup.ModuleSystem.shutDownAsync(ModuleSystem.java:349) at org.netbeans.core.NbLifeExit.doExit(NbLifeExit.java:137) at org.netbeans.core.NbLifeExit.run(NbLifeExit.java:94) at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.doEvent(NbMutexEventProvider.java:118) at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.readAccess(NbMutexEventProvider.java:93) at org.netbeans.modules.openide.util.LazyMutexImplementation.readAccess(LazyMutexImplementation.java:89) at org.openide.util.Mutex.readAccess(Mutex.java:260) at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:213) at org.netbeans.core.NbLifecycleManager.exit(NbLifecycleManager.java:119) at org.netbeans.core.windows.view.ui.MainWindow$9.windowClosing(MainWindow.java:546) at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349) at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349) at java.awt.AWTEventMulticaster.windowClosing(AWTEventMulticaster.java:349) at java.awt.Window.processWindowEvent(Window.java:2054) at javax.swing.JFrame.processWindowEvent(JFrame.java:305) at java.awt.Window.processEvent(Window.java:2013) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) [catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) ``` experienced with 201707050001