java.lang.IllegalArgumentException: Already listening to D:\jdk9_dev\jaxws\src\java.activation\windows\classes
new listener   : org.netbeans.modules.jdk.project.SourcesImpl@22a1a1bd
holder listener: org.netbeans.modules.jdk.project.SourcesImpl@22a1a1bd
   at org.openide.filesystems.FileChangeImpl.addFileChangeListenerImpl(FileChangeImpl.java:237)
   at org.openide.filesystems.FileUtil.addFileChangeListener(FileUtil.java:295)
   at org.netbeans.modules.jdk.project.SourcesImpl.recompute(SourcesImpl.java:155)
   at org.netbeans.modules.jdk.project.SourcesImpl.getSourceGroups(SourcesImpl.java:101)
   at org.netbeans.modules.versioning.core.ProjectMenuItem.getRootFilesForProjectNodes(ProjectMenuItem.java:218)
   at org.netbeans.modules.versioning.core.ProjectMenuItem.createItems(ProjectMenuItem.java:99)
   at org.netbeans.modules.versioning.core.ProjectMenuItem.access$200(ProjectMenuItem.java:76)
   at org.netbeans.modules.versioning.core.ProjectMenuItem$DynamicDummyItem.getMenuPresenters(ProjectMenuItem.java:202)
   at org.netbeans.modules.openide.awt.DefaultAWTBridge.convertComponents(DefaultAWTBridge.java:120)
   at org.openide.util.Utilities.actionsToPopup(Utilities.java:1739)
   at org.openide.util.Utilities.actionsToPopup(Utilities.java:1815)
   at org.openide.explorer.view.TreeView.createPopup(TreeView.java:1042)
   at org.openide.explorer.view.TreeView$PopupAdapter.showPopup(TreeView.java:1539)
   at org.openide.awt.MouseUtils$PopupMouseAdapter.maybePopup(MouseUtils.java:189)
   at org.openide.awt.MouseUtils$PopupMouseAdapter.mouseReleased(MouseUtils.java:184)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
   at java.awt.Component.processMouseEvent(Component.java:6535)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
   at java.awt.Component.processEvent(Component.java:6300)
   at java.awt.Container.processEvent(Container.java:2236)
   at java.awt.Component.dispatchEventImpl(Component.java:4891)
   at java.awt.Container.dispatchEventImpl(Container.java:2294)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4888)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4525)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4466)
   at java.awt.Container.dispatchEventImpl(Container.java:2280)
   at java.awt.Window.dispatchEventImpl(Window.java:2750)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   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$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:731)
   at java.awt.EventQueue$4.run(EventQueue.java:729)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   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)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)