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<p class="MsoNormal"><span lang="EN-US">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We're evaluating the use of Drools Fusion as rule engine for one of our projects, but after updating from version 5.0.1 to 5.1.0 to fix one persistence issue we faced new errors and some unexpected behavior changes in
already tested parts of our code, and we aren't unsure if it's our fault due to incorrect assumptions or if it's resulting from a new bug introduced in last release. Here follows what we are doing:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">1) we declared this in our Test_Rules.drl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> declare UserEvent <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> @role( event ) <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> @expires( 30s ) <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> end<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> query "get user by login" (String login)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> user : UserEvent(user.login == login)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> end<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">2) this is the code we use to retrieve the Drools session (implemented in a singleton):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> public StatefulKnowledgeSession getKnowledgeSessionInstance() {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> if (session == null) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> kbase = readKnowledgeBase();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> KnowledgeSessionConfiguration conf = KnowledgeBaseFactory.newKnowledgeSessionConfiguration();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> session = kbase.newStatefulKnowledgeSession(conf, null);
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> return session;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 3) that's how we load the rules (some non-pertinent code was omitted):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> private KnowledgeBase readKnowledgeBase() {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> KnowledgeBaseConfiguration config = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> config.setOption(EventProcessingOption.STREAM);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> kbuilder.add(ResourceFactory.newClassPathResource("Test_Rules.drl"), ResourceType.DRL);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> KnowledgeBuilderErrors errors = kbuilder.getErrors();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> if (errors.size() > 0) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> // (...)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> throw new IllegalArgumentException("Could not parse knowledge.");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(config);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> return kbase;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">(NOTE: Up to this point the code behaves exactly the same way in both versions and everything works as expected.)
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">4) in this method we check our event expiration, and that's where things starts to behave different. In version 5.0.1, the code always worked in the same way, returning a null reference to userValidation if the expiration
time is reached. Also, handleQuery is always an instance of EventFactHandle. Based in userValidation reference being null or not, we either retrieve it or update it. Again, non-related code was ommited:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> private UserTrackForValidation assertDesktopEvent(DesktopDeviceEvent event) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> UserEvent userValidation = null;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> StatefulKnowledgeSession session = sessionFactory.getKnowledgeSessionInstance(createEnviroment());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> QueryResults results = session.getQueryResults("get user by login", new String[] {event.getLogin()});<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> if (results.size() > 0) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> QueryResultsRow row = results.iterator().next();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> FactHandle handleQuery = row.getFactHandle("user");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> userValidation = (UserTrackForValidation) row.get("user");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> if (userValidation == null) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> try {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> userValidation = entityDAO.getUserTrackByLogin(event.getLogin());<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> } catch (Exception e) {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> e.printStackTrace();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> // (...)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> } <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> else {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> // (...) <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> session.update(handleQuery, userValidation);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> session.fireAllRules();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> return userValidation;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">However, starting with version 5.1.0, we observed some odd behaviors:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> a) after time expiration, we may or may not receive a null reference to userValidation, which renders the test line "if (userValidation == null)" erratic;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> b) even when we receive a (as far as we can tell) valid reference to userValidation, sometimes a NullPointerException is raised, as can be seen in the following stacktrace:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">java.lang.NullPointerException<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1329)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1288)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.drools.impl.StatefulKnowledgeSessionImpl.update(StatefulKnowledgeSessionImpl.java:248)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at br.com.todobpo.lam.ejb.session.ContactCenterRuleServiceImpl.assertSimpleEvent(ContactCenterRuleServiceImpl.java:191)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at br.com.todobpo.lam.ejb.session.ContactCenterRuleServiceImpl.insertEvent(ContactCenterRuleServiceImpl.java:89)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at java.lang.reflect.Method.invoke(Method.java:597)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at java.lang.reflect.Method.invoke(Method.java:597)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span>at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)<o:p></o:p></p>
<p class="MsoNormal"> at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_1000702.invoke(InvocationContextInterceptor_z_fillMethod_1000702.java)<o:p></o:p></p>
<p class="MsoNormal"> <span lang="EN-US">at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span>at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)<o:p></o:p></p>
<p class="MsoNormal"> at org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_1000702.invoke(InvocationContextInterceptor_z_setup_1000702.java)<o:p></o:p></p>
<p class="MsoNormal"> <span lang="EN-US">at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.tx.StatelessBMTInterceptor.handleInvocation(StatelessBMTInterceptor.java:106)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.tx.BMTInterceptor.invoke(BMTInterceptor.java:55)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span>at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)<o:p></o:p></p>
<p class="MsoNormal"> <span lang="EN-US">at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:524)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:211)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.Client.invoke(Client.java:1724)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.remoting.Client.invoke(Client.java:629)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at $Proxy7.invoke(Unknown Source)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at $Proxy6.insertEvent(Unknown Source)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at br.com.todobpo.lam.ejb.test.Authenticate.authenticationOk(Authenticate.java:70)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at java.lang.reflect.Method.invoke(Method.java:597)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.run(ParentRunner.java:236)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at $Proxy7.invoke(Unknown Source)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at $Proxy6.insertEvent(Unknown Source)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at br.com.todobpo.lam.ejb.test.Authenticate.authenticationOk(Authenticate.java:70)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at java.lang.reflect.Method.invoke(Method.java:597)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.junit.runners.ParentRunner.run(ParentRunner.java:236)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> c) handleQuery can either receive an EventFactHandle or a DisconnectedFactHandle, without no apparent pattern. For the later case (DisconnectedFactHandle), the returned class lacks a useful isValid() method (the current
implementation only throws an exception), thus we are unable to check the returned object before using it;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> d) finally, we noticed that all mentioned errors happens only when we set the real time clock in the KnowledgeSessionConfiguration object. Using the pseudo clock, there are no runtime errors and the object expiration
behavior appears to be correct, like in 5.0.1.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So, after all this information, we have a couple questions:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 1) Is really correct to assume that after an event expiration the object reference will always be null (as observed up to version 5.0.1) ? If not, how can we determine the event associated object sanity ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 2) Why starting from version 5.1.0 we started to observe the occurrence of DisconnectedFactHandle ? Can this detail be safely ignored, or is this a sign that something went wrong when trying to retrieve the event
?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 3) Is there something flawed in our presented approach ? Or did we bump into a new bug ?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal">Any help is apreciated. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Carlos<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" align="left" width="393" style="width:294.85pt;border-collapse:collapse;border:none;
margin-left:4.8pt;margin-right:4.8pt">
<tbody>
<tr style="height:17.0pt">
<td width="155" rowspan="6" valign="top" style="width:116.5pt;border:none;
background:#0F356C;padding:0cm 3.5pt 0cm 3.5pt;height:17.0pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed""><img width="143" height="115" id="Imagem_x0020_23" src="cid:image001.png@01CACF25.77ED4B20" alt="logo_.png"><span style="color:#1F497D"><o:p></o:p></span></span></i></p>
</td>
<td width="24" valign="top" style="width:17.85pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:17.0pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed";
color:white"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="bottom" style="width:160.5pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:17.0pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Arial","sans-serif";
color:white">Carlos Henrique P. da Silva</span></i><i><span style="font-size:
12.0pt;font-family:"Arial","sans-serif";color:white"><o:p></o:p></span></i></p>
</td>
</tr>
<tr style="height:2.85pt">
<td width="24" valign="top" style="width:17.85pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed";
color:white"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="top" style="width:160.5pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:white">Arquiteto<o:p></o:p></span></i></p>
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padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed";
color:white"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="top" style="width:160.5pt;border:none;border-right:solid #0F356C 1.0pt;
background:#0F356C;padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:white">55-48-3953-5088</span></i><i><span style="font-size:12.0pt;
font-family:"Arial","sans-serif";color:white"><o:p></o:p></span></i></p>
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<tr style="height:2.85pt">
<td width="24" valign="top" style="width:17.85pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed";
color:white"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="top" style="width:160.5pt;border:none;border-right:solid #0F356C 1.0pt;
background:#0F356C;padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:white">55-48-8822-2897<o:p></o:p></span></i></p>
</td>
</tr>
<tr style="height:2.85pt">
<td width="24" valign="top" style="width:17.85pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-family:"Frutiger 57 Condensed";
color:white"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="top" style="width:160.5pt;border:none;border-right:solid #0F356C 1.0pt;
background:#0F356C;padding:0cm 3.5pt 0cm 3.5pt;height:2.85pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";
color:white">carlos.dasilva@todobpo.com.br<o:p></o:p></span></i></p>
</td>
</tr>
<tr style="height:17.0pt">
<td width="24" valign="top" style="width:17.85pt;border:none;background:#0F356C;
padding:0cm 3.5pt 0cm 3.5pt;height:17.0pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<i><span style="color:#1F497D"><o:p> </o:p></span></i></p>
</td>
<td width="214" valign="top" style="width:160.5pt;border:none;border-right:solid #0F356C 1.0pt;
background:#0F356C;padding:0cm 3.5pt 0cm 3.5pt;height:17.0pt">
<p class="MsoNormal" style="mso-margin-bottom-alt:auto;mso-element:frame;
mso-element-frame-hspace:7.05pt;mso-element-wrap:around;mso-element-anchor-vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-top:48.75pt;
mso-height-rule:exactly">
<a href="http://www.todobpo.com.br"><i><span style="font-family:"Arial","sans-serif";color:white">www.todobpo.com.br</span></i></a><i><span style="font-family:"Arial","sans-serif";color:white"><o:p></o:p></span></i></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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