ajax报Cannot forward after response has been committed

Question

该程序是用来做一个监控系统的！我们有个服务端，接受一个客户端发过来的信息，然后解析数据显示给用户，运行几个月都是正常的，突然报告下面这个错误，意思是重复提交了，javaBean里是没有 mapping.findForward("add"); 怎么还会报这个错误呢，返回到页面的数据量是很大的！可能是这个原因吗！请有遇到过该问题的答复！谢谢！！！！！
严重: Servlet.service() for servlet action threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:312)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
        at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
        at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at as.huateng.struts.util.SignOnFilter.doFilter(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)

Answer 1

肯定是溢出了jsp默认的buffer是8kb，当我们的输出超过8kb时，就会发生IllegalStateException。在response完成之前，buffer已经溢出了。 
解决方法是修改默认值：<%@ page buffer="16kb" %> 

Answer 2

谢谢1楼的回复，但如果是溢出应该报buffer方面的异常啊？不应该报 Cannot forward after response has been committed这个异常吧！！！