[jbosstools-issues] [JBoss JIRA] (JBIDE-21588) NPEs when browsing through java ee project tree

NPEs when browsing through java ee project tree ----------------------------------------------- Key: JBIDE-21588 URL: https://issues.jboss.org/browse/JBIDE-21588 Project: Tools (JBoss Tools) Issue Type: Bug Components: upstream Affects Versions: 4.3.1.Beta2 Reporter: Martin Malina Assignee: Snjezana Peco Fix For: 4.4.0.Alpha1 I came across this while testing JBIDE-20802 . When I create the kitchensink project from JBoss Central and then click around in the Project Explorer, I will get errors in the error view and workspace log: {code} !ENTRY org.eclipse.ui.navigator 4 2 2016-01-27 11:50:47.557 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.navigator". !STACK 0 java.lang.NullPointerException at org.eclipse.jpt.common.ui.internal.jface.ItemTreeStateProviderManager.getChildren(ItemTreeStateProviderManager.java:74) at org.eclipse.jpt.common.ui.internal.navigator.NavigatorContentProvider.getChildren(NavigatorContentProvider.java:109) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:95) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:241) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:93) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$1.run(NavigatorContentServiceContentProvider.java:157) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:143) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getChildren(NavigatorContentServiceContentProvider.java:129) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1365) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:353) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:906) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:617) at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:813) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:791) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:611) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:762) at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1493) at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:903) at org.eclipse.jface.viewers.AbstractTreeViewer$4.treeExpanded(AbstractTreeViewer.java:1505) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:132) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499) at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1036) at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1256) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5955) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1121) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2047) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1113) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2569) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2015) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5692) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2130) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2337) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5756) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5193) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5342) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3695) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608) at org.eclipse.equinox.launcher.Main.run(Main.java:1515) !ENTRY org.eclipse.ui.navigator 4 0 2016-01-27 11:50:47.641 !MESSAGE An exception occurred invoking extension: org.eclipse.jpt.jpa.ui.jpaNavigatorContent for object org.jboss.tools.jsf.model.pv.JSFProjectTagLibs@1ffae821 !STACK 0 java.lang.NullPointerException at org.eclipse.jpt.common.ui.internal.jface.ItemTreeStateProviderManager.getChildren(ItemTreeStateProviderManager.java:74) at org.eclipse.jpt.common.ui.internal.navigator.NavigatorContentProvider.getChildren(NavigatorContentProvider.java:109) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:95) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:241) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:93) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$1.run(NavigatorContentServiceContentProvider.java:157) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:143) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getChildren(NavigatorContentServiceContentProvider.java:129) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1365) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:353) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:906) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:617) at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:813) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:791) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:611) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:762) at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1493) at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:903) at org.eclipse.jface.viewers.AbstractTreeViewer$4.treeExpanded(AbstractTreeViewer.java:1505) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:132) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499) at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1036) at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1256) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5955) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1121) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2047) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1113) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2569) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2015) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5692) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2130) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2337) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5756) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5193) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5342) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3695) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608) at org.eclipse.equinox.launcher.Main.run(Main.java:1515) !ENTRY org.eclipse.ui.navigator 4 2 2016-01-27 11:50:48.667 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.navigator". !STACK 0 java.lang.NullPointerException at org.eclipse.jpt.common.ui.internal.jface.ItemTreeStateProviderManager.getChildren(ItemTreeStateProviderManager.java:74) at org.eclipse.jpt.common.ui.internal.navigator.NavigatorContentProvider.getChildren(NavigatorContentProvider.java:109) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:95) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:241) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:93) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$1.run(NavigatorContentServiceContentProvider.java:157) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:143) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getChildren(NavigatorContentServiceContentProvider.java:129) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1365) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:353) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:906) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:617) at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:813) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:791) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:611) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:762) at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1493) at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:903) at org.eclipse.jface.viewers.AbstractTreeViewer$4.treeExpanded(AbstractTreeViewer.java:1505) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:132) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499) at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1036) at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1256) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5955) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1121) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2047) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1113) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2569) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2015) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5692) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2130) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2337) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5756) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5193) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5342) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3695) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608) at org.eclipse.equinox.launcher.Main.run(Main.java:1515) !ENTRY org.eclipse.ui.navigator 4 0 2016-01-27 11:50:48.670 !MESSAGE An exception occurred invoking extension: org.eclipse.jpt.jpa.ui.jpaNavigatorContent for object org.eclipse.jst.jee.ui.internal.navigator.web.WebAppProvider@35754437 !STACK 0 java.lang.NullPointerException at org.eclipse.jpt.common.ui.internal.jface.ItemTreeStateProviderManager.getChildren(ItemTreeStateProviderManager.java:74) at org.eclipse.jpt.common.ui.internal.navigator.NavigatorContentProvider.getChildren(NavigatorContentProvider.java:109) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:95) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:241) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getChildren(SafeDelegateTreeContentProvider.java:93) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$1.run(NavigatorContentServiceContentProvider.java:157) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:143) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getChildren(NavigatorContentServiceContentProvider.java:129) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1365) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:353) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:906) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:617) at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:813) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:791) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:611) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:762) at org.eclipse.jface.viewers.AbstractTreeViewer.handleTreeExpand(AbstractTreeViewer.java:1493) at org.eclipse.jface.viewers.TreeViewer.handleTreeExpand(TreeViewer.java:903) at org.eclipse.jface.viewers.AbstractTreeViewer$4.treeExpanded(AbstractTreeViewer.java:1505) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:132) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499) at org.eclipse.swt.widgets.TreeItem.sendExpand(TreeItem.java:1036) at org.eclipse.swt.widgets.Tree.expandItem_expandChildren(Tree.java:1256) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5955) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1121) at org.eclipse.swt.widgets.Tree.mouseDownSuper(Tree.java:2047) at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1113) at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2569) at org.eclipse.swt.widgets.Tree.mouseDown(Tree.java:2015) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5692) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227) at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2130) at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2337) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5756) at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method) at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5193) at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5342) at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method) at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3695) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608) at org.eclipse.equinox.launcher.Main.run(Main.java:1515) {code} This looks like an upstream bug, but somebody needs to check.