[rules-users] Drools Flow Events Not Working
Kris Verlaenen
kris.verlaenen at CS.KULEUVEN.BE
Mon Sep 20 11:29:25 EDT 2010
Hi,
The process instance should automatically be reconnected to the session (=
working memory) when it is reloaded from the database. It is a little
unclear however, from you stacktrace, how you get a reference to your
process instance after it has been restored. Particularly:
> org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent
> (WorkflowProcessInstanceImpl.java:346)
> at com.my.poc.PocFlowServiceImpl.processFlow(PocFlowServiceImpl.java:120)
Could you share how this PocFlowServiceImpl class gets the process instance
it then tries to signal? Does it retrieve the session from the session? Or
does it keep a reference from before?
Kris
----- Original Message -----
From: "jawa" <agohar at gmail.com>
To: <rules-users at lists.jboss.org>
Sent: Friday, September 10, 2010 7:17 PM
Subject: [rules-users] Drools Flow Events Not Working
>
> Hi,
> I am using drools flow 5.1.1 with JPA. I want my flow to stop at a certain
> point so I use an AND node with one incoming RuleGroup node and one
> incoming
> Event node. so as AND guarantees that It executes after both of the nodes
> are completed. So my flow stops there. Then i load the session from db and
> use following to raise an event on the session:
>
> StatefulKnowledgeSession session =
> JPAKnowledgeService.loadStatefulKnowledgeSession(9,knowledgeBase, null,
> environment);
> ProcessInstance p = session.getProcessInstance(9);
> System.out.println("Proc Found -> " + p);
> if (p != null && p.getState()==ProcessInstance.STATE_ACTIVE)
> {
> p.signalEvent("Test", vo);
> }
>
> But it fails with following exception:
>
> Exception in thread "main" java.lang.NullPointerException
> at
> org.drools.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:67)
> at
> org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.getWorkflowProcess(WorkflowProcessInstanceImpl.java:185)
> at
> org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:346)
> at com.my.poc.PocFlowServiceImpl.processFlow(PocFlowServiceImpl.java:120)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
> at
> org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
> at
> org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
> at
> org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
> at
> org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_fillMethod_20004366.invoke(InvocationContextInterceptor_z_fillMethod_20004366.java)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.setup(InvocationContextInterceptor.java:88)
> at
> org.jboss.aop.advice.org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor_z_setup_20004366.invoke(InvocationContextInterceptor_z_setup_20004366.java)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:62)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:56)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.tx.StatelessBMTInterceptor.handleInvocation(StatelessBMTInterceptor.java:106)
> at org.jboss.ejb3.tx.BMTInterceptor.invoke(BMTInterceptor.java:55)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:68)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421)
> at
> org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
> at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
> at
> org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
> at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
> at
> org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)
> at
> org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)
> at
> org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:524)
> at
> org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)
> at
> org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:211)
> at org.jboss.remoting.Client.invoke(Client.java:1724)
> at org.jboss.remoting.Client.invoke(Client.java:629)
> at
> org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
> at $Proxy3.invoke(Unknown Source)
> at
> org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
> at
> org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
> at $Proxy2.processFlow(Unknown Source)
> at net.plus.kbd.poc.StartFlow.main(StartFlow.java:39)
> at
> org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at
> org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
> at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
> at $Proxy3.invoke(Unknown Source)
> at
> org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
> at
> org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
> at $Proxy2.processFlow(Unknown Source)
> at com.my.poc.StartFlow.main(StartFlow.java:39)
>
> Then i tried to use this code:
>
> SignalEventCommand command = new SignalEventCommand();
> command.setProcessInstanceId(9);
> command.setEventType("Test");
> command.setEvent(true);
> session.execute(command);
>
> But it fails:
>
> Exception in thread "main" java.lang.NoSuchMethodError:
> org.drools.runtime.StatefulKnowledgeSession.execute(Lorg/drools/command/Command;)Lorg/drools/runtime/ExecutionResults;
> at com.my.poc.PocFlowServiceImpl.processFlow(PocFlowServiceImpl.java:127)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
>
> Although I have drools jars in my classpath. All required jars including
> drools-core-5.1.1.jar
>
> Any idea how can i raise an event ??
>
> Thanks
> --
> View this message in context:
> http://drools-java-rules-engine.46999.n3.nabble.com/Drools-Flow-Events-Not-Working-tp1453738p1453738.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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