eclipse 安装插件后无法启动

    今天安装eclipse插件，竟然安装之后无法启动。。。十分郁闷。。。
    第一步就是去看eclipse的日志文件，就在你的默认工作空间下的.metadata->.log 文件。。。
   发现错误：
   !ENTRY org.eclipse.ui 4 0 2012-06-21 16:23:17.591
   !MESSAGE Unhandled event loop exception
   !STACK 0
   java.lang.ClassCastException: org.eclipse.ui.internal.handlers.HandlerServiceFactory cannot be cast to         org.eclipse.ui.services.AbstractServiceFactory
at org.eclipse.ui.internal.services.WorkbenchServiceRegistry.loadFromRegistry(WorkbenchServiceRegistry.java:130)
at org.eclipse.ui.internal.services.WorkbenchServiceRegistry.getService(WorkbenchServiceRegistry.java:100)
at org.eclipse.ui.internal.services.ServiceLocator.getService(ServiceLocator.java:174)
at org.eclipse.ui.internal.Workbench$49.runWithException(Workbench.java:1892)
at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2609)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
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(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:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

    之后查找资料。。。几乎没有。。。崩溃。。。最后找到一点信息（https://bugs.eclipse.org/bugs/show_bug.cgi?id=307432），最后果断去eclipse文件夹下，查找带org.eclipse.rap.ui为文件头的jar文件，都删了（反正也不能用了，死马当活马医），之后启动，一切正常。。。不过原因还不是太清楚，望高手指点一下。。。