紧急求救：在websphere 成功部署.ear 文件后，为什么简单的 jsp不好使

yangping-dahhqa/Default Server Servlet Error: {0}: {1} %com.ibm.ejs.resources.seriousMessages       ﾃTk       
ping_jsp_1ﾘjava.lang.ClassCastException: ping_jsp_1
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.load(JspServlet.java:146)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:236)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:247)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:415)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:544)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:827)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:159)
at com.ibm.servlet.engine.webapp.IdleServletState.service(StrictLifecycleServlet.java:286)
at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:106)
at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:472)
at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:1012)
at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:913)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:499)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:278)
at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:105)
at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java:67)
at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:123)
at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:122)
at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:315)
at com.ibm.servlet.engine.http11.HttpConnection.handleRequest(HttpConnection.java:60)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:313)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:242)
at com.ibm.ws.util.CachedThread.run(ThreadPool.java:122)
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