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Version: 4.2.0 Build id: I20120321-0610 I tried importing my workspace preferences to a new workspace and got the following error in the log. Subsequent tries all worked fine (no exception) java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean at org.eclipse.e4.ui.workbench.addons.perspectiveswitcher.PerspectiveSwitcher$20.propertyChange(PerspectiveSwitcher.java:626) at org.eclipse.ui.preferences.ScopedPreferenceStore$3.run(ScopedPreferenceStore.java:375) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.preferences.ScopedPreferenceStore.firePropertyChangeEvent(ScopedPreferenceStore.java:372) at org.eclipse.ui.preferences.ScopedPreferenceStore$2.preferenceChange(ScopedPreferenceStore.java:194) at org.eclipse.core.internal.preferences.EclipsePreferences$3.run(EclipsePreferences.java:864) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.preferences.EclipsePreferences.firePreferenceEvent(EclipsePreferences.java:867) at org.eclipse.core.internal.preferences.EclipsePreferences.put(EclipsePreferences.java:880) at org.eclipse.core.internal.preferences.PreferencesService.copyFromTo(PreferencesService.java:356) at org.eclipse.core.internal.preferences.PreferencesService$6.visit(PreferencesService.java:708) at org.eclipse.core.internal.preferences.EclipsePreferences.accept(EclipsePreferences.java:142) at org.eclipse.core.internal.preferences.EclipsePreferences.accept(EclipsePreferences.java:146) at org.eclipse.core.internal.preferences.EclipsePreferences.accept(EclipsePreferences.java:146) at org.eclipse.core.internal.preferences.PreferencesService.internalApply(PreferencesService.java:712) at org.eclipse.core.internal.preferences.PreferencesService.applyPreferences(PreferencesService.java:92) at org.eclipse.ui.internal.wizards.preferences.WizardPreferencesImportPage1.transfer(WizardPreferencesImportPage1.java:185) at org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage.finish(WizardPreferencesPage.java:619) at org.eclipse.ui.internal.wizards.preferences.PreferencesImportWizard.performFinish(PreferencesImportWizard.java:88) at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:827) at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:432) at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.internal.handlers.WizardHandler$Import.executeHandler(WizardHandler.java:152) at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:279) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293) at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:72) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:229) at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:210) at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:131) at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:161) at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:464) at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157) 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:1016) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:910) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:85) at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:580) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:535) 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:353) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438) at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
Just hit this myself (I20120315-1300).
Fixed, Git reference http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/?id=84aa97866e00bdf58333d758abb10d0ec0b8ef29 The Eclipse preference mechanism does not know [by itself] type of the object stored for the preference, hence, notifications are usually arrive as "String" rather than a "Boolean".
Verified using I20120430-1800.
