Bug 423047

Description David M. Karr 2013-12-03 10:47:40 EST

In the last day I've noticed an odd behavior where I can be viewing a buffer that looks ok, and then I switch to another buffer and then back to the original, and what I see is that the buffer is showing line numbers, but no body, and no vertical scrollbar.  It's also showing some red markers left of the line numbers, which are likely accurate.  I currently had compile errors in this buffer in this particular instance of this test case.  Although there is no vertical scrollbar, I can scroll through the buffer with the down arrow, and it stops at the line number representing the real length of the file.

The last stacktrace in the log is this:
-----------------------------
!MESSAGE Exception while dispatching event org.osgi.service.event.Event [topic=org/eclipse/e4/ui/model/ui/ElementContainer/selectedElement/SET] to handler org.eclipse.e4.ui.services.internal.events.UIEventHandler@b4612c
!STACK 0
java.lang.NullPointerException
	at org.eclipse.compare.contentmergeviewer.ContentMergeViewer$ContentMergeViewerLayout.layout(ContentMergeViewer.java:121)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1291)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1298)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1277)
	at org.eclipse.swt.widgets.Composite.layout(Composite.java:666)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.layoutTopRight(StackRenderer.java:622)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.adjustTR(StackRenderer.java:602)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:1107)
	at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:66)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4688)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:205)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:80)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:171)
	at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:576)
	at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:543)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.delegateBringToTop(PartServiceImpl.java:610)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:590)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:544)
	at org.eclipse.e4.ui.internal.workbench.swt.AbstractPartRenderer.activate(AbstractPartRenderer.java:104)
	at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer$1.handleEvent(ContributedPartRenderer.java:59)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1081)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
	at org.eclipse.swt.widgets.Shell.setActiveControl(Shell.java:1453)
	at org.eclipse.swt.widgets.Shell.setActiveControl(Shell.java:1416)
	at org.eclipse.swt.widgets.Control.sendFocusEvent(Control.java:2856)
	at org.eclipse.swt.widgets.Widget.wmSetFocus(Widget.java:2421)
	at org.eclipse.swt.widgets.Control.WM_SETFOCUS(Control.java:5235)
	at org.eclipse.swt.widgets.Canvas.WM_SETFOCUS(Canvas.java:457)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4681)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4977)
	at org.eclipse.swt.internal.win32.OS.SetFocus(Native Method)
	at org.eclipse.swt.widgets.Control.forceFocus(Control.java:1098)
	at org.eclipse.swt.widgets.Control.setFocus(Control.java:3323)
	at org.eclipse.swt.widgets.Composite.setFocus(Composite.java:1042)
	at org.eclipse.ui.texteditor.AbstractTextEditor.setFocus(AbstractTextEditor.java:6218)
	at org.eclipse.ui.texteditor.StatusTextEditor.setFocus(StatusTextEditor.java:122)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.setFocus(JavaEditor.java:2389)
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.delegateSetFocus(CompatibilityPart.java:192)
	at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:243)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:249)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:220)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:107)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.focusGui(PartRenderingEngine.java:763)
	at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer$2.setFocus(ContributedPartRenderer.java:102)
	at org.eclipse.swt.custom.CTabItem.setFocus(CTabItem.java:329)
	at org.eclipse.swt.custom.CTabFolder.setFocus(CTabFolder.java:2528)
	at org.eclipse.swt.widgets.Control.fixFocus(Control.java:1053)
	at org.eclipse.swt.widgets.Control.setVisible(Control.java:3819)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3068)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3076)
	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1772)
	at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:279)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
	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:354)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
-------------------------

It's very likely that the buffer that I switched to before I saw the symptom was a compare buffer, as implied by this stacktrace.

I tried refreshing the buffer, and that did nothing.  I finally closed the buffer and reopened the file, and that fixed the display.