run the auctionMonitor in Jboss 4.2.1 GA server and open 2 or more browsers, FF, IE, Safari or opera, at the same machine and communicate with each other. while switching windows from one to another, the inactive windows frequently pops up internal error message and request a reload. After reloading, the application can still work but the problem repeatedly happens along the communication.

The following is the exceptions captured from jboss log.

2007-10-18 15:30:33,365 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/auctionMonitor].[Blocking Servlet]] Servlet.service() for servlet Blocking Servlet threw exception

java.util.ConcurrentModificationException

            at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)

            at java.util.HashMap$ValueIterator.next(HashMap.java:871)

            at com.icesoft.faces.webapp.http.core.DisposeBeans.in(DisposeBeans.java:33)

            at com.icesoft.faces.context.BridgeExternalContext.dispose(BridgeExternalContext.java:207)

            at com.icesoft.faces.context.View$2.run(View.java:59)

            at com.icesoft.faces.context.View.dispose(View.java:211)

            at com.icesoft.faces.webapp.http.core.DisposeViews.service(DisposeViews.java:32)

            at com.icesoft.faces.webapp.http.core.IDVerifier.service(IDVerifier.java:25)

            at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer$Matcher.serviceOnMatch(PathDispatcherServer.java:50)

            at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:19)

            at com.icesoft.faces.webapp.http.servlet.ThreadBlockingAdaptingServlet.service(ThreadBlockingAdaptingServlet.java:19)

            at com.icesoft.faces.webapp.http.servlet.EnvironmentAdaptingServlet.service(EnvironmentAdaptingServlet.java:29)

            at com.icesoft.faces.webapp.http.servlet.MainSessionBoundServlet.service(MainSessionBoundServlet.java:117)

            at com.icesoft.faces.webapp.http.servlet.SessionDispatcher.service(SessionDispatcher.java:35)

            at com.icesoft.faces.webapp.http.servlet.PathDispatcher$Matcher.serviceOnMatch(PathDispatcher.java:52)

            at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:29)

            at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:76)

            at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

            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:687)

            at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)

            at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:364)

            at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)

            at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.service(BlockingServlet.java:54)

            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

            at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

            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:230)

            at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

            at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)

            at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)

            at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

            at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

            at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)

            at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

            at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)

            at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

            at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)

            at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

            at java.lang.Thread.run(Thread.java:595)