[rules-dev] java.lang.NullPointerException while testing

[shubhranshu]

Hello everybody,

I am new to drools. We have to integrate drools in our application. After
lot of searching a found something very helpful. Here is what I did.

I created a new package say test.
I uploaded a new jar file which contains my model.
I created a new category say banking.
Then I created a rule under the banking category in test package.
Finally I create a new snapshot for deployment.

Then I get the changeset.xml
<change-set xmlns='http://drools.org/drools-5.0/change-set'
   xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
   xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/main/resources/change-set-1.0.0.xsd'
>
   <add>
        <resource
source='http://localhost:8080/guvnor-5.2.0.Final-tomcat-6.0/org.drools.guvnor.Guvnor/package/Banking/Test'
type='PKG' />
   </add>
</change-set>

Below is the code to test

package com.test;

import junit.framework.TestCase;

import org.drools.KnowledgeBase;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentConfiguration;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;


public class Test extends TestCase{
       public void testDroolsWithGuvnor() throws Exception {
               KnowledgeBase knowledgeBase = createKnowledgeBase();
               StatefulKnowledgeSession session =
knowledgeBase.newStatefulKnowledgeSession();
               try {
                       Person person = new Person();
                       person.setAge(20);
                       session.insert(person);
                       assertTrue(session.getFactCount() == 1);
                       session.fireAllRules();
                       assertTrue(session.getFactCount() == 2);
               }
               finally {
                       session.dispose();
               }
       }

       public static KnowledgeBase createKnowledgeBase(){
                KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
                kaconf.setProperty( "drools.agent.scanDirectories", "false"
);
                KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent( "test
agent", kaconf );
                kagent.applyChangeSet(
ResourceFactory.newClassPathResource("ChangeSet(12).xml"));
                return kagent.getKnowledgeBase();

       }
}

But when i try to test it using junit i get the following exception.


java.lang.NullPointerException
       at
org.drools.agent.impl.KnowledgeAgentImpl.processChangeSet(KnowledgeAgentImpl.java:223)
       at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:189)
       at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:174)
       at com.test.Test.createKnowledgeBase(Test.java:34)
       at com.test.Test.testDroolsWithGuvnor(Test.java:15)
       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 junit.framework.TestCase.runTest(TestCase.java:168)
       at junit.framework.TestCase.runBare(TestCase.java:134)
       at junit.framework.TestResult$1.protect(TestResult.java:110)
       at junit.framework.TestResult.runProtected(TestResult.java:128)
       at junit.framework.TestResult.run(TestResult.java:113)
       at junit.framework.TestCase.run(TestCase.java:124)
       at junit.framework.TestSuite.runTest(TestSuite.java:243)
       at junit.framework.TestSuite.run(TestSuite.java:238)
       at
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
       at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
       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)

Dont know how to deal with this

please help

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