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Bug 338278

Summary:	NPE and disappearing editors
Product:	[Eclipse Project] e4	Reporter:	John Arthorne <john.arthorne>
Component:	UI	Assignee:	Project Inbox <e4.ui-inbox>
Status:	RESOLVED WORKSFORME	QA Contact:
Severity:	normal
Priority:	P3	CC:	remy.suen
Version:	0.2
Target Milestone:	---
Hardware:	PC
OS:	Windows 7
Whiteboard:	stalebug

Description John Arthorne

2011-02-25 15:58:18 EST

Build: I20110114-1005

By dragging editors around in the editor area, I am able to make all editors disappear completely. After that point, attempting to open any editor results in an NPE, and Eclipse needs to be restarted to get it back into a working state. Here is the NPE:

!ENTRY org.eclipse.jface 4 2 2011-02-25 15:55:22.346
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NullPointerException
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2398)
	at org.eclipse.ui.internal.WorkbenchPage.access$14(WorkbenchPage.java:2348)
	at org.eclipse.ui.internal.WorkbenchPage$5.run(WorkbenchPage.java:2330)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2326)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2310)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2301)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:354)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:164)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:219)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:198)
	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:373)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:526)
	at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:265)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:259)
	at org.eclipse.jface.util.OpenStrategy$1.mouseSelectItem(OpenStrategy.java:433)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:366)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4126)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3715)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$6.run(PartRenderingEngine.java:824)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:740)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:87)
	at org.eclipse.ui.internal.Workbench$3.run(Workbench.java:540)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:522)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	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:344)
	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:622)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

Comment 1 John Arthorne

2011-02-25 15:59:23 EST

And here are steps to reproduce:

Open multiple editors
Drag one editor below the others to create a split area
Then drag that lower editor to be on the right hand side of the other editors so that they become side-by-side editors.

-> All editors vanish.

Comment 2 John Arthorne

2011-02-25 16:00:42 EST

One final note. After restarting, all the editors have this text:

No editor descriptor for id org.eclipse.ui.internal.emptyEditorTab

Once these broken editors are closed, I am back to normal.

Comment 3 Remy Suen

2011-02-25 19:27:49 EST

This might be bug 335050.

Comment 4 Eclipse Genie

2018-11-28 18:07:51 EST

This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet.

If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant.

--
The automated Eclipse Genie.

Comment 5 Lars Vogel

2019-06-05 07:29:46 EDT

This is a mass change to close all e4 bugs marked with "stalebug" whiteboard.

If this bug is still valid, please reopen and remove the "stalebug" keyword.