老师你好，我在跳转到message-list.jsp 的时候出错了

如题，MessageListServlet代码为：

package com.imooc.jdbc.servlet;

import com.imooc.jdbc.bean.Message;
import com.imooc.jdbc.service.MessageService;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

public class MessageListServlet extends HttpServlet {
   private MessageService messageService;

   @Override
   public void init(ServletConfig config) throws ServletException {
       super.init(config);
       messageService = new MessageService();
   }

   @Override
   protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       super.service(request, response);
//        获得当前页码
       int page = 1;
       String pageStr = request.getParameter("page");
           if (( pageStr != null) &&!(pageStr.equals(""))) {
               page = Integer.parseInt(pageStr);
       }
//        每页显示五条记录
       List<Message> messages = messageService.getMessages(page, 5);
       int count = messageService.countMessage();
       int last = (count % 5 == 0) ? (count / 5) : (count / 5 + 1);
       request.setAttribute("page",page);
       request.setAttribute("messages",messages);
       request.setAttribute("last",last);
       request.getRequestDispatcher("/WEB-INF/views/biz/message_list.jsp").forward(request,response);

   }

   @Override
   public void destroy() {
       super.destroy();
       messageService = null;
   }

}

xml配置为：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
        version="4.0">
   <welcome-file-list>
       <welcome-file>/index.jsp</welcome-file>
   </welcome-file-list>
   <servlet>
       <servlet-name>MessageListServlet</servlet-name>
       <servlet-class>com.imooc.jdbc.servlet.MessageListServlet</servlet-class>
   </servlet>
   <servlet-mapping>
       <servlet-name>MessageListServlet</servlet-name>
       <url-pattern>/message</url-pattern>
   </servlet-mapping>
   
   <error-page>
       <error-code>404</error-code>
       <location>/WEB-INF/views/error/404.jsp</location>
   </error-page>
   <error-page>
       <error-code>500</error-code>
       <location>/WEB-INF/views/error/500.jsp</location>
   </error-page>
</web-app>

执行的时候在MessageListServletHong 的请求转发的那条语句出错

报错信息为：

 java.lang.IllegalStateException: Cannot forward after response has been committed

at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:323)

at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)

at com.imooc.jdbc.servlet.MessageListServlet.service(MessageListServlet.java:36)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:748)