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[news.eclipse.webtools] AssertionFailed exception when opening JavaScript file

Hi,

when I try to open a JavaScript file, I occasionally get an error dialog saying "Multiple problems have occurred", "org.eclipse.core.runtime.AssertionFailedException", and "null argument:" in the Details box. At other times it works fine. What should I do about this?

My project is a Grails project, and I've added JavaScript support with the "Web Development Tools -> Add JavaScript support" command from project's context menu.

I'm running the Ganymede M7 package of Eclipse for Java EE on Linux x86_64, Sun JDK 6.

Log output follows.

Cheers,

Marcus

!ENTRY org.eclipse.ui 4 0 2008-05-21 15:07:00.360
!MESSAGE Unable to create editor ID org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart
!STACK 1
org.eclipse.ui.PartInitException: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart
        at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:598)
        at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:428)
        at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
        at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:266)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:403)
        at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2730)
        at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2693)
        at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2685)
        at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2637)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2632)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2616)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2607)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:318)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:160)
        at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228)
        at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:207)
        at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274)
        at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:370)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:607)
        at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:880)
        at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
        at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818)
        at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
        at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
        at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
        at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
        at org.eclipse.jface.util.OpenStrategy$1.mouseSelectItem(OpenStrategy.java:428)
        at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:364)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1154)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3398)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3030)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2394)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2358)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2210)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:494)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:489)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:112)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:379)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
!SUBENTRY 1 org.eclipse.ui 4 0 2008-05-21 15:07:00.362
!MESSAGE No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart

!ENTRY org.eclipse.jface 4 2 2008-05-21 15:07:00.364
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
org.eclipse.core.runtime.AssertionFailedException: null argument:
        at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)
        at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:74)
        at org.eclipse.ui.internal.EditorSite.<init>(EditorSite.java:46)
        at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:464)
        at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
        at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:266)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:403)
        at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2730)
        at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2693)
        at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2685)
        at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2637)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2632)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2616)
        at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2607)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:318)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:160)
        at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228)
        at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:207)
        at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274)
        at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:370)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:607)
        at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:880)
        at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
        at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818)
        at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
        at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
        at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
        at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
        at org.eclipse.jface.util.OpenStrategy$1.mouseSelectItem(OpenStrategy.java:428)
        at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:364)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1154)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3398)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3030)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2394)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2358)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2210)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:494)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:489)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:112)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:379)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1212)

!ENTRY org.eclipse.ui 4 0 2008-05-21 15:07:00.631
!MESSAGE Unable to create editor ID org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart
!STACK 1
org.eclipse.ui.PartInitException: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart
        at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:598)
        at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:428)
        at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
        at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:266)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:403)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:381)
        at org.eclipse.ui.internal.WorkbenchPage.findEditor(WorkbenchPage.java:2027)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.isOpenInEditor(EditorUtility.java:126)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.linkToEditor(PackageExplorerPart.java:1011)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.handlePostSelectionChanged(PackageExplorerPart.java:915)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.access$1(PackageExplorerPart.java:910)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$3.selectionChanged(PackageExplorerPart.java:435)
        at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:842)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:880)
        at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
        at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:840)
        at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1153)
        at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1178)
        at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:250)
        at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:244)
        at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:418)
        at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
        at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
        at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3375)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2394)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2358)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2210)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:494)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:489)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:112)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:379)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
!SUBENTRY 1 org.eclipse.ui 4 0 2008-05-21 15:07:00.631
!MESSAGE No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart

!ENTRY org.eclipse.jface 4 2 2008-05-21 15:07:00.631
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
org.eclipse.core.runtime.AssertionFailedException: null argument:
        at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)
        at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:74)
        at org.eclipse.ui.internal.EditorSite.<init>(EditorSite.java:46)
        at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:464)
        at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
        at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:266)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:403)
        at org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:381)
        at org.eclipse.ui.internal.WorkbenchPage.findEditor(WorkbenchPage.java:2027)
        at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.isOpenInEditor(EditorUtility.java:126)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.linkToEditor(PackageExplorerPart.java:1011)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.handlePostSelectionChanged(PackageExplorerPart.java:915)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.access$1(PackageExplorerPart.java:910)
        at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$3.selectionChanged(PackageExplorerPart.java:435)
        at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:842)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:880)
        at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
        at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:840)
        at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1153)
        at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1178)
        at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:250)
        at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:244)
        at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:418)
        at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
        at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
        at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3375)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2394)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2358)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2210)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:494)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:489)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:112)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:379)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1212)