[rules-users] Drools Flow Fluent API Help
Daniel Nathanson
dan at ddnconsulting.com
Mon Dec 27 10:41:10 EST 2010
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 at ddnconsulting.com>
> 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
>
>
> _______________________________________________
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>
>
>
>
> --
> - 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 at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
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