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When I navigate to a .class file in a jar in my project I am presented with the class viewer which allows me to attach a source jar to the class file so I can see the source of that jar's classes. Whenever I do that I get the following error message in the log with a dialog with the same main text. java.lang.reflect.InvocationTargetException at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:403) at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507) at org.eclipse.ui.internal.progress.ProgressMonitorJobsDialog.run(ProgressMonitorJobsDialog.java:275) at org.eclipse.ui.internal.progress.ProgressManager$3.run(ProgressManager.java:977) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.progress.ProgressManager.busyCursorWhile(ProgressManager.java:1012) at org.eclipse.ui.internal.progress.ProgressManager.busyCursorWhile(ProgressManager.java:987) at org.eclipse.ui.internal.progress.ProgressManager.run(ProgressManager.java:1195) at org.eclipse.jdt.internal.ui.javaeditor.ClassFileEditor$SourceAttachmentForm.applySourceAttachment(ClassFileEditor.java:30 3) at org.eclipse.jdt.internal.ui.javaeditor.ClassFileEditor$2.widgetSelected(ClassFileEditor.java:286) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033) 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:288) 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:382) 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) Caused by: java.lang.IllegalArgumentException: Attempted to beginRule: R/, does not match outer scope rule: P/samba-fcs-patch at org.eclipse.core.runtime.Assert.isLegal(Assert.java:64) at org.eclipse.core.internal.jobs.ThreadJob.illegalPush(ThreadJob.java:122) at org.eclipse.core.internal.jobs.ThreadJob.push(ThreadJob.java:232) at org.eclipse.core.internal.jobs.ImplicitJobs.begin(ImplicitJobs.java:58) at org.eclipse.core.internal.jobs.JobManager.beginRule(JobManager.java:230) at org.eclipse.core.internal.resources.WorkManager.checkIn(WorkManager.java:117) at org.eclipse.core.internal.resources.Workspace.prepareOperation(Workspace.java:1747) at org.eclipse.core.internal.resources.File.setContents(File.java:364) at org.eclipse.jdt.internal.core.JavaProject.setSharedProperty(JavaProject.java:2885) at org.eclipse.jdt.internal.core.JavaProject.writeFileEntries(JavaProject.java:2651) at org.eclipse.jdt.internal.core.JavaModelManager$7.run(JavaModelManager.java:1188) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800) at org.eclipse.jdt.internal.core.JavaModelManager$PerProjectInfo.writeAndCacheClasspath(JavaModelManager.java:1182) at org.eclipse.jdt.internal.core.SetClasspathOperation.executeOperation(SetClasspathOperation.java:61) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:709) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:775) at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:2815) at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:2846) at org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathSupport.updateProjectClasspath(BuildPathSupport.java:277) at org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathSupport.modifyClasspathEntry(BuildPathSupport.java:186) at org.eclipse.jdt.internal.ui.wizards.buildpaths.SourceAttachmentBlock$1.run(SourceAttachmentBlock.java:587) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) Root exception: java.lang.IllegalArgumentException: Attempted to beginRule: R/, does not match outer scope rule: P/samba-fcs-patch at org.eclipse.core.runtime.Assert.isLegal(Assert.java:64) at org.eclipse.core.internal.jobs.ThreadJob.illegalPush(ThreadJob.java:122) at org.eclipse.core.internal.jobs.ThreadJob.push(ThreadJob.java:232) at org.eclipse.core.internal.jobs.ImplicitJobs.begin(ImplicitJobs.java:58) at org.eclipse.core.internal.jobs.JobManager.beginRule(JobManager.java:230) at org.eclipse.core.internal.resources.WorkManager.checkIn(WorkManager.java:117) at org.eclipse.core.internal.resources.Workspace.prepareOperation(Workspace.java:1747) at org.eclipse.core.internal.resources.File.setContents(File.java:364) at org.eclipse.jdt.internal.core.JavaProject.setSharedProperty(JavaProject.java:2885) at org.eclipse.jdt.internal.core.JavaProject.writeFileEntries(JavaProject.java:2651) at org.eclipse.jdt.internal.core.JavaModelManager$7.run(JavaModelManager.java:1188) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800) at org.eclipse.jdt.internal.core.JavaModelManager$PerProjectInfo.writeAndCacheClasspath(JavaModelManager.java:1182) at org.eclipse.jdt.internal.core.SetClasspathOperation.executeOperation(SetClasspathOperation.java:61) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:709) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:775) at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:2815) at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:2846) at org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathSupport.updateProjectClasspath(BuildPathSupport.java:277) at org.eclipse.jdt.internal.ui.wizards.buildpaths.BuildPathSupport.modifyClasspathEntry(BuildPathSupport.java:186) at org.eclipse.jdt.internal.ui.wizards.buildpaths.SourceAttachmentBlock$1.run(SourceAttachmentBlock.java:587) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
> Caused by: java.lang.IllegalArgumentException: Attempted to beginRule: R/, does not match outer scope rule: P/samba-fcs-patch
*** This bug has been marked as a duplicate of bug 243692 ***
As a workaround, removing the Perforce plugin (or replacing it with the latest one) should fix the problem.
Verified for 3.5M2
