Re: [rules-users] Drools Flow Fluent API Help

Hi Mauricio, Were you ever able to figure out what I am doing wrong? Regards, Dan Nathanson On Dec 23, 2010, at 3:10 AM, Mauricio Salatino wrote: Hi There.. What version of Drools are you using? I can help you to figure out what is happening.. 2010/12/23 Dan Nathanson <dan(a)ddnconsulting.com&gt; > Hi, > > I've been banging my head against this for days and just can't get it > to work. At this point I'd like to just get the example code working. > I've got a simple class that is currently being driven by a JUnit > test case. I just want to create a Process flow and execute it. I > don't care what it does at this point. Hello world level stuff. > > My method under test: > > public String runFlow() throws Exception { > > RuleFlowProcessFactory factory > = RuleFlowProcessFactory.createProcess("org.drools.process"); > factory > // header > .name("My process").packageName("org.drools") > // nodes > .startNode(1).name("Start").done() > .actionNode(2).name("Action") > .action("java", "System.out.println(\"Hello > World\");").done() > .endNode(3).name("End").done() > // connections > .connection(1, 2) > .connection(2, 3); > > RuleFlowProcess process = factory.validate().getProcess(); > > KnowledgeBase knowledgeBase = > KnowledgeBaseFactory.newKnowledgeBase(); > KnowledgeBuilder builder = > KnowledgeBuilderFactory.newKnowledgeBuilder(knowledgeBase); > > Package pkg = new Package("package1"); > pkg.addProcess(process); > RuleBase ruleBase = RuleBaseFactory.newRuleBase(); > ruleBase.addPackage(pkg); > > Collection<KnowledgePackage> kpackages = > builder.getKnowledgePackages(); > KnowledgePackage kpackage = new KnowledgePackageImp(pkg); > kpackages.add(kpackage); > knowledgeBase.addKnowledgePackages(kpackages); > > StatefulKnowledgeSession ksession = > knowledgeBase.newStatefulKnowledgeSession(); > > KnowledgeRuntimeLogger logger = > KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession); > > ksession.startProcess("org.drools.process"); > > return "foo"; > } > > When I run this process, I get an exception when the Action node is > run. It is a NPE and it happens because the metaData map in the > underlying ActionNode does not contain a KVP for "Action". It looks > like that KVP is added in in the DroolsAction class when the public > void wire(Object object) method is called. Unfortunately, I can't > figure out what causes that method to be called. I'm pretty sure my > problem is with the set up of my knowledge base (the call to new > KnowledgePackageImp() is suspect), but I can't figure out how to set > up the knowledge base when building a RuleFlowProcess using the > RuleFlowProcessFactory. None of the examples I can find show how to > do this. > > Note that if I take out the Action node and just have Start and End > nodes, it works fine. > > I am using Drools 5.1.0, but it doesn't work with Drools 5.0.1 either. > > Any help would be appreciated. The flat spot on my forehead is > getting flatter every day I continue to bang my head against the wall. > > Here's the output (including KnowledgeRuntimeLogger output): > > BEFORE RULEFLOW STARTED process:My process[id=org.drools.process] > BEFORE RULEFLOW NODE TRIGGERED node:Start[id=1] process:My > process[id=org.drools.process] > null process:My process[id=org.drools.process] > BEFORE RULEFLOW NODE TRIGGERED node:Action[id=2] process:My > process[id=org.drools.process] > > java.lang.RuntimeException: unable to execute Action > at > org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:56) > at > org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117) > at > org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178) > at > org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:144) > at > org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49) > at > org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41) > at > org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117) > at > org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:32) > at > org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:192) > at > org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:309) > at > org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1644) > at > org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1622) > at > org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:301) > at > com.proferi.epm.process.DroolsFlowManager.runFlow(DroolsFlowManager.java:75) > at > com.proferi.epm.process.DroolsFlowManagerTest.testRunFlow(DroolsFlowManagerTest.java:33) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59) > at > org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98) > at > org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79) > at > org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87) > at > org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77) > at > org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42) > at > org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88) > at > org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51) > at > org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44) > at > org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27) > at > org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37) > at > org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42) > at org.junit.runner.JUnitCore.run(JUnitCore.java:130) > at > com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:64) > Caused by: java.lang.NullPointerException > at > org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:54) > ... 34 more > > Regards, > > Dan Nathanson > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- - CTO @ http://www.plugtree.com - MyJourney @ http://salaboy.wordpress.com - Co-Founder @ http://www.jbug.com.ar - Salatino "Salaboy" Mauricio - _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users