Eclipse can't start after update

!SESSION 2012-10-15 08:21:47.367 -----------------------------------------------eclipse.buildId=M20120914-1800java.version=1.7.0_01java.vendor=Oracle CorporationBootLoader constants: OS=win32, ARCH=x86_64, WS=win32Command-line arguments:  -os win32 -ws win32 -arch x86_64!ENTRY org.eclipse.equinox.event 2 0 2012-10-15 08:21:48.459!MESSAGE [SCR] Found components with duplicated names! Details: Component1 : Component[    name = org.eclipse.equinox.event    activate = activate    deactivate = deactivate    modified =     configuration-policy = optional    factory = null    autoenable = true    immediate = false    implementation = org.eclipse.equinox.internal.event.EventComponent    state = Unsatisfied    properties =     serviceFactory = false    serviceInterface = [org.osgi.service.event.EventAdmin]    references = null    located in bundle = org.eclipse.equinox.event_1.2.100.v20110502 [270]]Component2: Component[    name = org.eclipse.equinox.event    activate = activate    deactivate = deactivate    modified =     configuration-policy = optional    factory = null    autoenable = true    immediate = false    implementation = org.eclipse.equinox.internal.event.EventComponent    state = Unsatisfied    properties =     serviceFactory = false    serviceInterface = [org.osgi.service.event.EventAdmin]    references = null    located in bundle = org.eclipse.equinox.event_1.2.200.v20120522-2049 [89]]  !ENTRY org.eclipse.equinox.p2.transport.ecf 2 0 2012-10-15 08:21:48.474!MESSAGE [SCR] Found components with duplicated names! Details: Component1 : Component[    name = org.eclipse.equinox.p2.transport.ecf    activate = activate    deactivate = deactivate    modified =     configuration-policy = optional    factory = null    autoenable = true    immediate = false    implementation = org.eclipse.equinox.internal.p2.transport.ecf.ECFTransportComponent    state = Unsatisfied    properties = {p2.agent.servicename=org.eclipse.equinox.internal.p2.repository.Transport}    serviceFactory = false    serviceInterface = [org.eclipse.equinox.p2.core.spi.IAgentServiceFactory]    references = null    located in bundle = org.eclipse.equinox.p2.transport.ecf_1.0.0.v20111128-0624 [275]]Component2: Component[    name = org.eclipse.equinox.p2.transport.ecf    activate = activate    deactivate = deactivate    modified =     configuration-policy = optional    factory = null    autoenable = true    immediate = false    implementation = org.eclipse.equinox.internal.p2.transport.ecf.ECFTransportComponent    state = Unsatisfied    properties = {p2.agent.servicename=org.eclipse.equinox.internal.p2.repository.Transport}    serviceFactory = false    serviceInterface = [org.eclipse.equinox.p2.core.spi.IAgentServiceFactory]    references = null    located in bundle = org.eclipse.equinox.p2.transport.ecf_1.0.100.v20120305-0333 [120]]  !ENTRY org.eclipse.core.resources 2 10035 2012-10-15 08:21:49.535!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.!ENTRY org.eclipse.e4.ui.workbench 4 0 2012-10-15 08:21:52.000!MESSAGE Unable to create class 'org.eclipse.e4.core.commands.CommandServiceAddon' from bundle '53'!STACK 0org.eclipse.e4.core.di.InjectionException: java.lang.ClassCastException: Cannot cast org.eclipse.core.commands.CommandManager to org.eclipse.core.commands.CommandManager    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63)    at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:859)    at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:111)    at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:319)    at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:253)    at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:185)    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:105)    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:71)    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:49)    at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:254)    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:557)    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)    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(Unknown Source)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)    at java.lang.reflect.Method.invoke(Unknown Source)    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)Caused by: java.lang.ClassCastException: Cannot cast org.eclipse.core.commands.CommandManager to org.eclipse.core.commands.CommandManager    at java.lang.Class.cast(Unknown Source)    at org.eclipse.e4.core.internal.contexts.EclipseContext.get(EclipseContext.java:566)    at org.eclipse.e4.core.commands.CommandServiceAddon.init(CommandServiceAddon.java:30)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)    at java.lang.reflect.Method.invoke(Unknown Source)    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)    ... 27 more

解决方法

Go into damaged workspace/.metadata and delete the .lock file.
Go to workspace/.metadata/.plugins/org.eclipse.core.resources and delete the .snap file.
Start Eclipse with the command eclipse -clean.
Eclipse should start now. After Eclipse has been started and has initialized and validated the workspace, close Eclipse.