java.lang.IllegalStateException：Cannot forward after response has been committed
今天查看应用程序的日志文件, 发现其中反复的出现如下的异常:Servlet.service() for servlet action threw exceptionjava.lang.IllegalStateException: Cannot forward after response has been committed at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:313) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063) at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at AuthorizationFilter.doFilter(AuthorizationFilter.java:66) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
然后在网上查看了一些相关的贴子, 基本上的意思就是 response 已经失效之后,又对response进行了调用, 因为response的状态已经改变了 再次调用就会触发这个异常.
然后对代码进行查看,发现了问题:
在上面的日志中大家可以找到这一行: AuthorizationFilter.doFilter(AuthorizationFilter.java:66)
源文件中对应代码如下:
chain.doFilter(request, response);
在此次对response调用之前,有如下的调用:
config.getServletContext().getRequestDispatcher("/WEB-INF/pages/Error.jsp").forward(request, response);
在这个时候 response 就被提交了.
再执行到 chain.doFilter(request, response);
的时候,response has been committed.
解决办法:在第一次forward之后,加一条return;语句. 原理就是不要类似以上的2条语句,
同时执行到,也就是不要在response已经提交后 再次对response进行调用.
类似情况:
Response.sendRedirect();后没有加return语句.
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