[jboss-jira] [JBoss JIRA] (JBRULES-3388) KnowledgeAgent custom classloader not working for PKG resources

[Herman Post (JIRA)]

Herman Post created JBRULES-3388:
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             Summary: KnowledgeAgent custom classloader not working for PKG resources
                 Key: JBRULES-3388
                 URL: https://issues.jboss.org/browse/JBRULES-3388
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 5.3.1.Final
         Environment: Windows 7, Java7-5, JBoss AS7.1
            Reporter: Herman Post
            Assignee: Mark Proctor


I believe there may be a bug when trying to use a custom class loader with the KnowledgeAgent and the KnowledgeBuilderConfiguration, and when the ChangeSet is a PKG resource. 

I have been trying to get the knowledge-agent-classloader sample from the new Drools Cookbook to work with a PKG resource.  The sample works fine for a DRL resource, but when I convert it to use my fact jar, and a PKG resource containing my rules, which I downloaded from Guvnor, it throws a ClassNotFoundException for my fact model.  If I put my fact model in the classpath, the error goes away and my rules can be added to the KnowledgeAgent and run correctly.  Following is the code from the sample that I have converted, and I have attached a zip file with a complete project demonstrating the problem.  Also,  I  can get my rules and fact model to work if I use a DRL ChangeSet.knowledge-agent-classloader.zip

  URL modelJarURL = getClass().getResource("Patient-1.0.jar"); 

        URLClassLoader customURLClassloader = new URLClassLoader(new URL[] {modelJarURL }); 

        KnowledgeBuilderConfiguration kbuilderConfig = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, 
                customURLClassloader); 

        KnowledgeBaseConfiguration kbaseConfig = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null, customURLClassloader); 
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(kbaseConfig); 

        KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration(); 
        KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("test", kbase, aconf, kbuilderConfig); 

        // kagent.applyChangeSet(new ClassPathResource("change-set.xml", getClass())); // this goes with model.jar 
        // kagent.applyChangeSet(new ClassPathResource("drl-change-set.xml", getClass())); // this goes with Patient.jar 
        kagent.applyChangeSet(new ClassPathResource("pkg-change-set.xml", getClass())); // this goes with Patient.jar 

        return kagent.getKnowledgeBase(); 

Following is the stack trace from the error: 

java.lang.NullPointerException 
        at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:148) 
        at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016) 
        at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785) 
        at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657) 
        at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190) 
        at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169) 
        at drools.cookbook.chapter02.KnowledgeAgentClassloaderTest.createKnowledgeBase(KnowledgeAgentClassloaderTest.java:59)
        at drools.cookbook.chapter02.KnowledgeAgentClassloaderTest.customClassloaderTest(KnowledgeAgentClassloaderTest.java:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
        at java.lang.reflect.Method.invoke(Unknown Source) 
        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.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

I have been having the exact same problem when trying to use a custom class loader with just a KnowldegeBuilder and no KnowledgeAgent.   


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