weblogic 集群中,proxyServer 代理服务经常出现这样的错误

<Mar 4, 2011 7:12:12 PM CST> <Error> <HTTP> <BEA-101020> <[weblogic.servlet.inte rnal.WebAppServletContext@26ac825 - appName: 'BEAProxy4_myCluster_ProxyServer', name: 'BEAProxy4_myCluster_ProxyServer', context-path: '', spec-version: 'null']  Servlet failed with Exception
java.lang.IllegalStateException: Response already committed
        at weblogic.servlet.internal.ServletResponseImpl.objectIfCommitted(Servl etResponseImpl.java:1553)
        at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletRespon seImpl.java:612)
        at weblogic.servlet.proxy.HttpClusterServlet.service(HttpClusterServlet. java:305)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run (StubSecurityHelper.java:227)
        Truncated. see log file for complete stacktrace
>