WebSphere V6.1發佈包後啓動異常

異常信息如下：
at com.ibm.ws.wswebcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:652)
at com.ibm.ws.webcontainer.webapp.WebApp.commonInitializationFinish(WebApp.java:354)
at com.ibm.ws.wswebcontainer.webapp.WebApp.initialize(WebApp.java:292)
at com.ibm.ws.wswebcontainer.webapp.WebGroup.addWebApplication(WebGroup.java:92)
at com.ibm.ws.wswebcontainer.VirtualHost.addWebApplication(VirtualHost.java:157)
at com.ibm.ws.wswebcontainer.WebContainer.addWebApp(WebContainer.java:671)
at com.ibm.ws.wswebcontainer.WebContainer.addWebApplication(WebContainer.java:624)
at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:335)
at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:551)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1305)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1138)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:569)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startModule(ApplicationMgrImpl.java:1777)
at com.ibm.ws.runtime.component.ApplicationMgrImpl._startModule(ApplicationMgrImpl.java:1725)
at com.ibm.ws.runtime.component.ApplicationMgrImpl$ApplicationNotifier.classChanged(ApplicationMgrImpl.java:1937)
at com.ibm.ws.classloader.ClassLoaderManager.checkAndNotify(ClassLoaderManager.java:548)
at com.ibm.ws.classloader.ClassLoaderManager.access$000(ClassLoaderManager.java:71)
at com.ibm.ws.classloader.ClassLoaderManager$ReloadTimerTask.alarm(ClassLoaderManager.java:584)
at com.ibm.ejs.util.am._Alarm.run(_Alarm.java:90)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)

主要是這個異常：
Caused by: java.lang.ClassFormatError: (com/*/*Util) unknown constant pool entry tag at offset=631