[jboss-user] [jBPM] - Boolean process variable - XOR check

wishmaster7 do-not-reply at jboss.com
Tue Jan 29 05:51:45 EST 2013 

wishmaster7 [https://community.jboss.org/people/wishmaster7] created the discussion

"Boolean process variable - XOR check"

To view the discussion, visit: https://community.jboss.org/message/794848#794848

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Hi all,

I have a simple example with a boolean variable defined in my process, and in a diverging XOR I try to check this variable in order to decide which path my process must follow. This seems simple, but I get an exception, like if the process could not find the variable. Could someone help me ?

Here is the stack trace of the error :

SEVERE: "Servlet.service()" pour la servlet Resteasy a généré une exception
org.jboss.resteasy.spi.UnhandledException: org.jbpm.workflow.instance.WorkflowRuntimeException: [project.myProcess:12 - Gateway:3] -- Exception when trying to evaluate constraint ko in split Gateway
    at org.jboss.resteasy.core.SynchronousDispatcher.unwrapException(SynchronousDispatcher.java:345)
    at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:321)
    at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:214)
    at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190)
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:534)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496)
    at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Caused by: org.jbpm.workflow.instance.WorkflowRuntimeException: [project.myProcess:12 - Gateway:3] -- Exception when trying to evaluate constraint ko in split Gateway
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:130)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
    at org.jbpm.workflow.instance.node.ActionNodeInstance.triggerCompleted(ActionNodeInstance.java:55)
    at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:51)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
    at org.jbpm.workflow.instance.node.JoinInstance.triggerCompleted(JoinInstance.java:152)
    at org.jbpm.workflow.instance.node.JoinInstance.internalTrigger(JoinInstance.java:52)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
    at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
    at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
    at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)
    at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:188)
    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:303)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:168)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:138)
    at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1082)
    at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:320)
    at org.drools.command.runtime.process.StartProcessCommand.execute(StartProcessCommand.java:120)
    at org.drools.command.runtime.process.StartProcessCommand.execute(StartProcessCommand.java:39)
    at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)
    at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:367)
    at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:223)
    at org.jbpm.integration.console.CommandDelegate.startProcess(CommandDelegate.java:120)
    at org.jbpm.integration.console.ProcessManagement.newInstance(ProcessManagement.java:88)
    at org.jboss.bpm.console.server.FormProcessingFacade.startProcessWithUI(FormProcessingFacade.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140)
    at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:255)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:220)
    at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:209)
    at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:519)
    ... 25 more
Caused by: java.lang.RuntimeException: Exception when trying to evaluate constraint ko in split Gateway
    at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:79)
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
    ... 64 more
Caused by: java.lang.RuntimeException: unable to execute ReturnValueEvaluator
    at org.jbpm.process.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:130)
    at org.jbpm.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:72)
    ... 65 more
Caused by: java.lang.NullPointerException
    at defaultPackage.Process_defaultPackage_MyProcess_0b7d725f8c6444ebb06b8060ebd85e51.returnValueEvaluator2(Process_defaultPackage_MyProcess_0b7d725f8c6444ebb06b8060ebd85e51.java:20)
    at defaultPackage.Process_defaultPackage_MyProcess_0b7d725f8c6444ebb06b8060ebd85e51ReturnValueEvaluator2Invoker.evaluate(Process_defaultPackage_MyProcess_0b7d725f8c6444ebb06b8060ebd85e51ReturnValueEvaluator2Invoker.java:15)
    at org.jbpm.process.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:128)
    ... 66 more


The variable name is "toto", defined in the process; the XOR gateway has "return toto=true;" for one direction, "return toto=false;" for the other direction.

The BPMN file of the process is as attachment.

Maybe if it helps... I run jBPM 5.4 on Tomcat 7.0. Process writter with Eclipse (Helios) plugin.
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