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

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