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Using I20081119-1600, I got this error in the .log file. Unfortunately I don't have steps to reproduce right now. org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.IllegalArgumentException: Index out of bounds) at org.eclipse.swt.SWT.error(SWT.java:3787) at org.eclipse.swt.SWT.error(SWT.java:3705) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:136) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3852) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:333) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) 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:370) 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) Caused by: java.lang.IllegalArgumentException: Index out of bounds at org.eclipse.swt.SWT.error(SWT.java:3771) at org.eclipse.swt.SWT.error(SWT.java:3705) at org.eclipse.swt.SWT.error(SWT.java:3676) at org.eclipse.swt.custom.StyledText.setStyleRanges(StyledText.java:8562) at org.eclipse.swt.custom.StyledText.replaceStyleRanges(StyledText.java:6962) at org.eclipse.jface.text.TextViewer.addPresentation(TextViewer.java:4452) at org.eclipse.jface.text.TextViewer.changeTextPresentation(TextViewer.java:4531) at org.eclipse.jdt.internal.ui.javaeditor.SemanticHighlightingPresenter.updatePresentation(SemanticHighlightingPresenter.java:448) at org.eclipse.jdt.internal.ui.javaeditor.SemanticHighlightingPresenter$1.run(SemanticHighlightingPresenter.java:347) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133) ... 23 more
I *think* it might be caused by the same issue as bug 255625. Please reopen if you see this again in builds > N20081119-2000. *** This bug has been marked as a duplicate of bug 255625 ***