我希望尽可能优雅地处理我的webapp中的错误
当然，我RTFM并将以下内容添加到我的web.xml文件中：
<!-- WEB-INF/web.xml -->
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/error.zul</location>
</error-page>
这是基本Java webapp error handling，效果很好。由于ZK是一个AJAXy框架，因此在呈现页面后可能会抛出错误，因此ZK也为此提供了自己的错误处理：
<!-- zk.xml -->
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/zk/common/error.zul</location>
</error-page>
这也很有效，然而，它们并不好玩。在AU请求期间抛出错误时，ZK错误消息显示为应该但是我得到以下stderr：
Feb 26, 2013 10:37:04 PM org.zkoss.zk.ui.http.DHtmlLayoutServlet handleError:273
WARNING: Failed to load the error page: /zk/common/error.zul
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:168)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.handleError(DHtmlLayoutServlet.java:267)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:138)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doPost(DHtmlLayoutServlet.java:149)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:416)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
Feb 26, 2013 10:37:04 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet auEngine threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at org.zkoss.web.servlet.dsp.ServletDspContext.getOut(ServletDspContext.java:113)
at org.zkoss.web.servlet.dsp.impl.TextNode.interpret(TextNode.java:44)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:51)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:60)
at org.zkoss.web.util.resource.DspExtendlet.service(DspExtendlet.java:92)
at org.zkoss.web.util.resource.ClassWebResource.web0(ClassWebResource.java:583)
at org.zkoss.web.util.resource.ClassWebResource.web(ClassWebResource.java:569)
at org.zkoss.web.util.resource.ClassWebResource.service(ClassWebResource.java:260)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:392)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:464)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.zkoss.web.servlet.Servlets.include(Servlets.java:882)
at org.zkoss.zk.ui.http.Utils.handleError(Utils.java:143)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.handleError(DHtmlLayoutServlet.java:278)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:138)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doPost(DHtmlLayoutServlet.java:149)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:416)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
Feb 26, 2013 10:37:04 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet zkLoader threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at org.zkoss.web.servlet.dsp.ServletDspContext.getOut(ServletDspContext.java:113)
at org.zkoss.web.servlet.dsp.impl.TextNode.interpret(TextNode.java:44)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:51)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:60)
at org.zkoss.web.util.resource.DspExtendlet.service(DspExtendlet.java:92)
at org.zkoss.web.util.resource.ClassWebResource.web0(ClassWebResource.java:583)
at org.zkoss.web.util.resource.ClassWebResource.web(ClassWebResource.java:569)
at org.zkoss.web.util.resource.ClassWebResource.service(ClassWebResource.java:260)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:392)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:464)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.zkoss.web.servlet.Servlets.include(Servlets.java:882)
at org.zkoss.zk.ui.http.Utils.handleError(Utils.java:143)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.handleError(DHtmlLayoutServlet.java:278)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:138)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doPost(DHtmlLayoutServlet.java:149)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:416)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
Feb 26, 2013 10:37:04 PM org.apache.catalina.core.StandardHostValve custom
SEVERE: Exception Processing ErrorPage[exceptionType=java.lang.Throwable, location=/error.zul]
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at org.zkoss.web.servlet.dsp.ServletDspContext.getOut(ServletDspContext.java:113)
at org.zkoss.web.servlet.dsp.impl.TextNode.interpret(TextNode.java:44)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:51)
at org.zkoss.web.servlet.dsp.impl.RootNode.interpret(RootNode.java:60)
at org.zkoss.web.util.resource.DspExtendlet.service(DspExtendlet.java:92)
at org.zkoss.web.util.resource.ClassWebResource.web0(ClassWebResource.java:583)
at org.zkoss.web.util.resource.ClassWebResource.web(ClassWebResource.java:569)
at org.zkoss.web.util.resource.ClassWebResource.service(ClassWebResource.java:260)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:392)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:464)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.zkoss.web.servlet.Servlets.include(Servlets.java:882)
at org.zkoss.zk.ui.http.Utils.handleError(Utils.java:143)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.handleError(DHtmlLayoutServlet.java:278)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:138)
at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doPost(DHtmlLayoutServlet.java:149)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:416)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:680)
同样，这是ZK特定错误处理程序（在/zk/common/error.zul）拦截错误的时候。根据堆栈跟踪，似乎错误传播到正常的Java webapp错误处理程序（/error.zul）。
如果首次呈现页面时发生错误，则会显示正常的错误处理程序（在`/error.zul'处），而不是按预期显示页面，不会记录任何问题。
有关如何解决此问题的任何想法？ 可以/我应该在我的ZK错误处理程序上做些什么来阻止错误传播吗？