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 -------------------------------------------------------------- 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. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/794848#794848] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]