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1. Ensure faces-config.xml is not open in any editor. 2. Mark faces-config.xml read-only and then attempt to open the file. A message appears in a dialog providing the option to mark the file writable - irrespective of the user's selection in the dialog, the editor never displays anything other than "Please wait while the editor finishes loading..." The file *is* marked writable if the user selects this option in the dialog, but the editor will not load the file until the editor is closed and reopened. This is likely in some way related to the fact that multiple threads are responsible for opening the file and displaying the "waiting" message, with the read-only condition preventing the expected interaction between the threads. The following "Unhandled event loop exception" is thrown: org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.IllegalArgumentException: Argument cannot be null) at org.eclipse.swt.SWT.error(SWT.java:4282) at org.eclipse.swt.SWT.error(SWT.java:4197) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:138) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.jface.dialogs.MessageDialog.open(MessageDialog.java:334) at org.eclipse.jface.dialogs.MessageDialog.open(MessageDialog.java:364) at org.eclipse.jface.dialogs.MessageDialog.openQuestion(MessageDialog.java:463) at org.eclipse.team.internal.ui.DefaultUIFileModificationValidator$1.run(DefaultUIFileModificationValidator.java:132) 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:4683) at org.eclipse.team.internal.ui.DefaultUIFileModificationValidator.validateEdit(DefaultUIFileModificationValidator.java:130) at org.eclipse.team.internal.core.DefaultFileModificationValidator.validateEdit(DefaultFileModificationValidator.java:49) at org.eclipse.team.internal.core.FileModificationValidatorManager.validateEdit(FileModificationValidatorManager.java:67) at org.eclipse.core.resources.team.FileModificationValidator.validateEdit(FileModificationValidator.java:58) at org.eclipse.core.internal.resources.Workspace$7.run(Workspace.java:2579) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.resources.Workspace.validateEdit(Workspace.java:2582) at org.eclipse.jst.jsf.facesconfig.ui.FacesConfigEditor.init(FacesConfigEditor.java:363) at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:828) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:647) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595) at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313) at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180) at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270) at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473) at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1245) at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1198) at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1597) at org.eclipse.ui.internal.PartStack.add(PartStack.java:493) at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103) at org.eclipse.ui.internal.PartStack.add(PartStack.java:479) at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112) at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63) at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:225) at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:213) at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:808) at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:707) at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:666) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2942) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2850) at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2842) at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2793) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2789) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2773) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2756) at org.eclipse.ui.ide.IDE.openEditor(IDE.java:683) at org.python.pydev.navigator.actions.PyOpenResourceAction.openFiles(PyOpenResourceAction.java:100) at org.python.pydev.navigator.actions.PyOpenPythonFileAction.run(PyOpenPythonFileAction.java:84) at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221) at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185) at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152) at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) 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:344) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386) Caused by: java.lang.IllegalArgumentException: Argument cannot be null at org.eclipse.swt.SWT.error(SWT.java:4263) at org.eclipse.swt.SWT.error(SWT.java:4197) at org.eclipse.swt.SWT.error(SWT.java:4168) at org.eclipse.swt.widgets.Widget.error(Widget.java:468) at org.eclipse.swt.widgets.Widget.checkParent(Widget.java:277) at org.eclipse.swt.widgets.Widget.<init>(Widget.java:149) at org.eclipse.swt.widgets.Control.<init>(Control.java:110) at org.eclipse.swt.widgets.Scrollable.<init>(Scrollable.java:75) at org.eclipse.swt.widgets.Composite.<init>(Composite.java:95) at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:238) at org.eclipse.ui.forms.editor.FormEditor.addPage(FormEditor.java:325) at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:211) at org.eclipse.ui.forms.editor.FormEditor.addPage(FormEditor.java:308) at org.eclipse.jst.jsf.facesconfig.ui.FacesConfigEditor$AddPagesTask.doRun(FacesConfigEditor.java:535) at org.eclipse.jst.jsf.facesconfig.ui.ModelLoader$ModelLoaderComplete.run(ModelLoader.java:197) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) ... 91 more
