Hi,
I am using Tomcat 6.0.32 with the Http11NioProtocol connector to implement
long polling.
My comet processor is holding the HttpSevletResponse (After receiving a
CometEvent.BEGIN) on a queue until an event is ready to send back. When it
sends back the event, it is writing a binary stream to an applet, so I use
response.getOutputStream().write() to send data back. When writing to the
stream it is synchronized.
I close the OutputStream when finished
try {
response.setHeader("messageId", messageId);
//wrapper for the OutputStream.
auctionObjectOutput = new
AuctionObjectOutput(response.getOutputStream());
// write to OutputStream
auctionObjectOutput.writeObject(event);
} finally {
try {
//internally calls out.flush() and out.close()
auctionObjectOutput.close();
} catch (IOException ex) {
LogHandler.issueCritical(ex);
}
}
This works and I can continually long poll for new data from the Applet.
Problem:
Occasionally (like 0.1% of the time), when another web page in a second
frame reloads (Independent JSP generated from SpringController in same
container) the page loads with what appears to be the byte stream for the
applet and I get the following stack trace.
It seems from the logs that the when the framed page reloads it is somehow
retrieving a stale response object (ie. not recycled properly by the
connector). Could this happen and it this likely to be an issue?
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
javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at
org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
at
org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
at
org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:326)
at
org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:342)
at
org.apache.jsp.WEB_002dINF.jsp.lot_jsp._jspx_meth_c_005fforEach_005f0(lot_jsp.java:476)
at
org.apache.jsp.WEB_002dINF.jsp.lot_jsp._jspx_meth_c_005fwhen_005f0(lot_jsp.java:429)
at
org.apache.jsp.WEB_002dINF.jsp.lot_jsp._jspx_meth_c_005fchoose_005f0(lot_jsp.java:384)
at
org.apache.jsp.WEB_002dINF.jsp.lot_jsp._jspService(lot_jsp.java:116)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
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.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:229)
at
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
at
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1031)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:815)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
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.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:164)
at
org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
at
org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
at
org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:406)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:343)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
at
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:109)
at
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:355)
at
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:149)
at
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
at
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at
org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:889)
at
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:732)
at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2262)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.lang.Thread.run(Unknown Source)
Thanks
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