如何解决服务器中的非法状态异常

Question

异常跟踪：

“”java.lang.IllegalStateException：在org.apache.catalina.core.applicationDispatcher.doForward（applicationDispatcher.java:328)在org.apache.catalina.core.applicationDispatcher.doForward（applicationDispatcher.java:318)在com.zoho.campaign.client.filters.campaignDomainfilter.doFilter（applicationDispatcher.java:140)在LicationFilterChain.java:240)在org.apache.catalina.core.applicationFilterChain.doFilter(applicationFilterChain.java:207)在com.adventnet.zoho.crmplus.agent.filter.crmplusFilter.doFilter(crmplusFilter.java:55)在org.apache.catalina.core.applicationFilterChain.internaldoFilter(applicationFilterChain.java:240)在e.invoke(StandardWrapperValve.Java:212)在org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.Java:106)在org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.502)在org.apache.catalina.valves.rewrite.rewritevalve.invoke(authenticator.authenticator在cat.util.net.nioEndpoint$socketprocessor.run(NIOEndpoint.java:1476)在java.util.concurrent.ThreadPoolExecutor.runworker（ThreadPoolExecutor.java:1142)在java.util.concurrent.ThreadPoolExecutor$worker.run（ThreadPoolExecutor.java:617)在org.apache.tomcat.util.Threads.taskThread$wrappingrunnable.run（TaskThread.java:61)在

在尝试转发RequestDispatcher时,iam会收到此异常

这个问题发生的原因是什么？

代码：

public void doFilter(ServletRequest req,ServleResponse res,FilterChain filterchain)thorws IOException,Exception
{
String downloaurl="expired";
boolean is_allow_download=false;
HttpServletRequest request=(HttpServletRequest)req;
HttpServletResponse response=(HttpServletResponse)res;
RequestDispatcher rd=null;
if(downloadurl.equals("expired"))
    {
    request.setAttribute("isexpire", "expire");
  }
  else if(downloadurl.equals("no_data"))
     {
       request.setAttribute("isdataAval", false);
  }
     if(url1.contains("export.do") && !downloadurl.equals("no_data") && is_allow_download )
       {
         rdc = request.getRequestDispatcher("users/export.do");
         rdc.forward(request, response);
       }
      rdc = request.getRequestDispatcher("users/closed.do"); 
        rdc.forward(request, response);

}

Answer 1

假设您的堆栈跟踪，在您试图调用forward（）方法之前，您的RS已经提交。您的应用程序早前已返回RS。

附注。请添加一些代码片段以获取更多上下文。