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Created attachment 232952 [details] Screenshot of error Consistently, when I split the editing region into two, switching between the regions gives a error "Unhandled event loop exception: No more handles" and then says that an SWT error occured, do I want to exit. In the attached screenshot, this error occurs whenever I switch between the top frame (T1.java) and the bottom frame (T2.java), but not if I were to switch editors in the same "region" (i.e., if T3 was open in the same region as T1, switching between T1 and T3 does not cause the error, but switching between (T1 or T3) and T2 (and back) does. This occurs on a clean install of Eclipse Kepler Standard 4.3. -------------------------------- Session Data: eclipse.buildId=4.3.0.I20130605-2000 java.version=1.7.0_21 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Framework arguments: -product org.eclipse.epp.package.standard.product Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.standard.product -------------------------------- Exception Stack Trace: org.eclipse.swt.SWTError: No more handles at org.eclipse.swt.SWT.error(SWT.java:4423) at org.eclipse.swt.SWT.error(SWT.java:4312) at org.eclipse.swt.SWT.error(SWT.java:4283) at org.eclipse.swt.widgets.Widget.error(Widget.java:472) at org.eclipse.swt.widgets.Control.createHandle(Control.java:704) at org.eclipse.swt.widgets.Label.createHandle(Label.java:199) at org.eclipse.swt.widgets.Control.createWidget(Control.java:744) at org.eclipse.swt.widgets.Control.<init>(Control.java:112) at org.eclipse.swt.widgets.Label.<init>(Label.java:101) at org.eclipse.ui.texteditor.StatusLineContributionItem.fill(StatusLineContributionItem.java:182) at org.eclipse.jface.action.SubContributionItem.fill(SubContributionItem.java:59) at org.eclipse.jface.action.StatusLineManager.update(StatusLineManager.java:327) at org.eclipse.ui.internal.WorkbenchPage.updateActivations(WorkbenchPage.java:287) at org.eclipse.ui.internal.WorkbenchPage.access$15(WorkbenchPage.java:265) at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:194) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$2.run(PartServiceImpl.java:183) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:181) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:595) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:539) 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.WM_MOUSEACTIVATE(Shell.java:2334) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4655) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340) at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1627) at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2075) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method) at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2544) at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:80) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4706) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4990) at org.eclipse.swt.internal.win32.OS.PeekMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.PeekMessage(OS.java:3141) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) 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(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) 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)
I have the same problem. In addition to messagebox my workbench sometimes painted in gray and I should to refresh damaget areas. Status line also is blank almost anytime when this error happens. It's impossible to work with this. Some time ago this happened only (and always) in editors with external sources (e.g. JDK or Target Platform) in Debug mode, but today I have encountered with this in editor with my own code. Kepler is first 4.x release which I try to actively use and now I will switch back to 3.8.
*** This bug has been marked as a duplicate of bug 402983 ***
