[rules-users] Drools Flow Fluent API Help
Mauricio Salatino
salaboy at gmail.com
Mon Dec 27 10:43:37 EST 2010
I'm working with 5.2.0.SNAPSHOT.. I will try to test your code and let you
know my results..
Greetings.
2010/12/27 Daniel Nathanson <dan at ddnconsulting.com>
> 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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>> 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 -
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>
>
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--
- CTO @ http://www.plugtree.com
- MyJourney @ http://salaboy.wordpress.com
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
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