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I got this stack trace in the .log. It looks like a monitor is passed in, but when it is cancelled, the corresponding exception is never caught. org.eclipse.swt.SWTException: Failed to execute runnable (org.eclipse.core.runtime.OperationCanceledException) at org.eclipse.swt.SWT.error(SWT.java:3777) at org.eclipse.swt.SWT.error(SWT.java:3695) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:136) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3825) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3449) 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:59) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:39) at java.lang.reflect.Method.invoke(Method.java:612) 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: org.eclipse.core.runtime.OperationCanceledException at org.eclipse.core.runtime.OperationCanceledException.<init>(OperationCanceledException.java:34) at org.eclipse.jdt.core.dom.ASTConverter.checkCanceled(ASTConverter.java:402) at org.eclipse.jdt.core.dom.ASTConverter.convert(ASTConverter.java:2642) at org.eclipse.jdt.core.dom.ASTConverter.convert(ASTConverter.java:1263) at org.eclipse.jdt.core.dom.CompilationUnitResolver.convert(CompilationUnitResolver.java:256) at org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:933) at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:657) at org.eclipse.jdt.internal.ui.compare.JavaStructureCreator.createStructureComparator(JavaStructureCreator.java:294) at org.eclipse.jdt.internal.ui.compare.JavaStructureCreator.createStructureComparator(JavaStructureCreator.java:253) at org.eclipse.compare.structuremergeviewer.StructureCreator.internalCreateStructure(StructureCreator.java:102) at org.eclipse.compare.structuremergeviewer.StructureCreator.access$0(StructureCreator.java:90) at org.eclipse.compare.structuremergeviewer.StructureCreator$1.run(StructureCreator.java:80) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.compare.internal.Utilities$4.run(Utilities.java:779) at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:155) at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:158) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133) ... 23 more eclipse.buildId=I20080930-0921 java.fullversion=J2RE 1.6.0 IBM J9 2.4 Windows XP x86-32 jvmwi3260-20080415_18762 (JIT enabled, AOT enabled) J9VM - 20080415_018762_lHdSMr JIT - r9_20080415_1520 GC - 20080415_AA BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=fr_CA Command-line arguments: -os win32 -ws win32 -arch x86 -debug -consolelog -console
*** This bug has been marked as a duplicate of bug 262557 ***