Servlet 异常处理

[09-6-5 22:29:35:968 CST] 0000004d Servlet       E com.ibm.wps.engine.Servlet doGet EJPEJ0004E: 发生了意外异常。
                                 java.lang.IllegalStateException: Response already committed.
	at com.ibm.ws.webcontainer.webapp.WebAppDispatcherContext.sendError(WebAppDispatcherContext.java:579)
	at com.ibm.ws.webcontainer.srt.SRTServletResponse.sendError(SRTServletResponse.java:868)
	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:152)
	at com.ibm.wps.state.phases.PhaseManagerImpl.next(PhaseManagerImpl.java:414)
	at com.ibm.wps.state.phases.AbstractPhaseManager.next(AbstractPhaseManager.java:125)
	at com.ibm.wps.engine.phases.WPInitPhase.next(WPInitPhase.java:366)
	at com.ibm.wps.engine.Servlet.doGet(Servlet.java:520)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1572)
	at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1521)
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:136)
	at com.ibm.wps.state.filter.StateCleanup.doFilter(StateCleanup.java:86)
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)
	at com.ibm.wps.mappingurl.impl.URLAnalyzer.doFilter(URLAnalyzer.java:263)
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)
	at com.ibm.partnerworld.vic.wps.filter.DeepLinkFilter.doFilter(DeepLinkFilter.java:135)
	at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:142)
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:121)
	at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:82)
	at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:759)
	at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:89)
	at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1936)
	at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:114)
	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:472)
	at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:411)
	at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:101)
	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:566)
	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:619)
	at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:952)
	at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
	at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1471)

在Servlet或者JSP中如果下面还有code要执行，而你直接redirect了而没有在后面写return，就会包这个错.