I am seeing the following error in the jboss server logs. It shows up about once every 20 seconds. Has anyone seen this before or know what might cause it? A similar error also shows up in the "Messages" area of the jbpm console.

05-31 11:34:11,105 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14) Message was not delivered.

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14) org.jboss.errai.bus.client.api.base.MessageDeliveryFailure: could not deliver message because the outgoing queue is full

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.errai.bus.server.WorkerFactory.sendDeliveryFailure(WorkerFactory.java:128)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.errai.bus.server.WorkerFactory.deliverGlobal(WorkerFactory.java:107)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.errai.bus.server.AsyncDispatcher.dispatchGlobal(AsyncDispatcher.java:58)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.errai.bus.server.service.ErraiServiceImpl.store(ErraiServiceImpl.java:74)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.errai.bus.server.servlet.DefaultBlockingServlet.doPost(DefaultBlockingServlet.java:104)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

05-31 11:34:11,106 ERROR [STDERR] (http-stinger%2F10.20.36.59-8080-14)  at java.lang.Thread.run(Thread.java:619)

After restarting the server, now I am seeing the following error instead, after logging back into the jbpm console again. However, this time, the error only showed up twice, not every 20 seconds.

05-31 11:45:46,027 ERROR [STDERR] (Dispatch Worker Thread) Exception in thread "Dispatch Worker Thread"

05-31 11:45:46,028 ERROR [STDERR] (Dispatch Worker Thread) org.jboss.errai.bus.server.QueueUnavailableException: no queue available to send. (queue or session may have expired)

05-31 11:45:46,028 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.server.ServerMessageBusImpl.getQueueByMessage(ServerMessageBusImpl.java:716)

05-31 11:45:46,028 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.server.ServerMessageBusImpl.send(ServerMessageBusImpl.java:316)

05-31 11:45:46,028 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.client.api.builder.ConversationMessageWrapper.sendNowWith(ConversationMessageWrapper.java:167)

05-31 11:45:46,029 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.client.api.builder.AbstractMessageBuilder$1.sendNowWith(AbstractMessageBuilder.java:41)

05-31 11:45:46,029 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.client.util.ErrorHelper.disconnectRemoteBus(ErrorHelper.java:99)

05-31 11:45:46,029 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.client.util.ErrorHelper.handleMessageDeliveryFailure(ErrorHelper.java:126)

05-31 11:45:46,029 ERROR [STDERR] (Dispatch Worker Thread)      at org.jboss.errai.bus.server.Worker.run(Worker.java:113)

Jbpm 4.3

JBoss 5.1.0

I don't know whether this issue is related to or caused by the problem above, but I'll document it here for reference: I tried to perform an action on a user task (ie. click one of the buttons that appears in the task form) but it appears the user task no longer shows up in the conole, but neither did jbpm take the action (transition) I was expecting it to take. This occurred right around the time that the errors above occurred.