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java.lang.IllegalStateException: Timer already cancelled. at java.util.Timer.sched(Timer.java:354) at java.util.Timer.schedule(Timer.java:170) at oracle.ide.explorer.IconOverlayTracker$NodeWatcher.updateVisibleNodes(IconOverlayTracker.java:802) at oracle.ide.explorer.IconOverlayTracker$NodeWatcher.access$3000(IconOverlayTracker.java:713) at oracle.ide.explorer.IconOverlayTracker$NodeWatcher$NodeUserListener.treeExpanded(IconOverlayTracker.java:969) at javax.swing.JTree.fireTreeExpanded(JTree.java:2666) at javax.swing.JTree.setExpandedState(JTree.java:3427) at javax.swing.JTree.expandPath(JTree.java:2163) at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2204) at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191) at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149) at oracle.ideimpl.plaf.WindowsTreeUI.access$600(WindowsTreeUI.java:39) at oracle.ideimpl.plaf.WindowsTreeUI$MouseHandler.mousePressed(WindowsTreeUI.java:178) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.Component.processMouseEvent(Component.java:6287) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at oracle.ideimpl.explorer.CustomTree.processMouseEvent(CustomTree.java:220) at java.awt.Component.processEvent(Component.java:6055) at java.awt.Container.processEvent(Container.java:2039) at java.awt.Component.dispatchEventImpl(Component.java:4653) at java.awt.Container.dispatchEventImpl(Container.java:2097) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4233) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166) at java.awt.Container.dispatchEventImpl(Container.java:2083) at java.awt.Window.dispatchEventImpl(Window.java:2489) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:607) at java.awt.EventQueue$1.run(EventQueue.java:605) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:621) at java.awt.EventQueue$2.run(EventQueue.java:619) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:618) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)