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Create a Project (JAXB, EJB, etc..) Add JPA facet to the project R-Click on the project and select properties Remove JPA (uncheck box) from Project Facets Click on Apply Select +JPA (highlight) in the list of properties to modify Notice it says 'The project facet... is not present.. Click on OK button for Properties dialog Receive the following Error in Error Log Problems occurred when invoking code from plug-in: "org.eclipse.jface". java.lang.IllegalArgumentException: unregistered listener: org.eclipse.jpt.jpa.ui.internal.properties.JpaProjectPropertiesPage$4@3015a3 at org.eclipse.jpt.common.utility.internal.model.ChangeSupport.removeListener(ChangeSupport.java:148) at org.eclipse.jpt.common.utility.internal.model.SingleAspectChangeSupport.removeListener(SingleAspectChangeSupport.java:112) at org.eclipse.jpt.common.utility.internal.model.ChangeSupport.removePropertyChangeListener(ChangeSupport.java:404) at org.eclipse.jpt.common.utility.internal.model.AbstractModel.removePropertyChangeListener(AbstractModel.java:184) at org.eclipse.jpt.common.utility.internal.model.value.AbstractPropertyValueModel.removePropertyChangeListener(AbstractPropertyValueModel.java:88) at org.eclipse.jpt.jpa.ui.internal.properties.JpaProjectPropertiesPage.disengageListeners(JpaProjectPropertiesPage.java:489) at org.eclipse.jpt.common.ui.internal.properties.JptProjectPropertiesPage.dispose(JptProjectPropertiesPage.java:333) at org.eclipse.ui.internal.dialogs.PropertyPageNode.disposeResources(PropertyPageNode.java:73) at org.eclipse.jface.preference.PreferenceDialog$2.run(PreferenceDialog.java:302) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jface.preference.PreferenceDialog.close(PreferenceDialog.java:316) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.close(FilteredPreferenceDialog.java:698) at org.eclipse.jface.preference.PreferenceDialog$13.run(PreferenceDialog.java:987) 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.preference.PreferenceDialog.okPressed(PreferenceDialog.java:945) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.okPressed(FilteredPreferenceDialog.java:448) at org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:233) at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) 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.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:158) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411) 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.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:977) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:893) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:91) at org.eclipse.ui.internal.Workbench$3.run(Workbench.java:565) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:520) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) 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:352) 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:624) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:579) at org.eclipse.equinox.launcher.Main.run(Main.java:1433) at org.eclipse.equinox.launcher.Main.main(Main.java:1409)
