请大侠帮忙分析错误代码

Question

17:00:43 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
17:00:43 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - Retrying request
17:01:04 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
17:01:04 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - Retrying request
17:01:25 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - I/O exception (java.net.ConnectException) caught when processing request: Connection timed out: connect
17:01:25 INFO  [http-8000-4]   org.apache.commons.httpclient.HttpMethodDirector     - Retrying request
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 com.widetrust.helper.RequestUtils.doForward(RequestUtils.java:71)
at com.widetrust.helper.RequestUtils.doForward(RequestUtils.java:40)
at com.hangbao.os.travelSkyPrice.TravelSkyPriceEdge.doGetPost(TravelSkyPriceEdge.java:52)
at com.hangbao.os.travelSkyPrice.TravelSkyPriceEdge.doGet(TravelSkyPriceEdge.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at com.widetrust.helper.RequestUtils.doForward(RequestUtils.java:71)
at com.widetrust.controller.ServletController.doGetPost(ServletController.java:205)
at com.widetrust.controller.ServletController.doGet(ServletController.java:50)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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 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

java.lang.IllegalStateException: Cannot forward after response has been committed
检查你跳转前的那个方法要有返回值return null;

Answer 2

Cannot forward after response has been committed其實很明顯了，在你forward之後，你又再一次要輸出或者跳轉之類的，所以就這樣

Answer 3

是否使用到hibernate？如过用到强烈要求你检查session