[jboss-jira] [JBoss JIRA] Created: (JBRULES-1264) NPE at BaseObjectClassFieldExtractor.getLongValue with null fields

[Alexandre Gattiker (JIRA)]

NPE at BaseObjectClassFieldExtractor.getLongValue with null fields
------------------------------------------------------------------

                 Key: JBRULES-1264
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1264
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.2
            Reporter: Alexandre Gattiker
         Assigned To: Mark Proctor


Removing one of the three rules magically solves the problem.


java.lang.NullPointerException
	at org.drools.base.extractors.BaseObjectClassFieldExtractor.getLongValue(BaseObjectClassFieldExtractor.java:106)
	at org.drools.base.ClassFieldExtractor.getLongValue(ClassFieldExtractor.java:203)
	at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.setValue(CompositeObjectSinkAdapter.java:467)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:292)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:153)
	at org.drools.reteoo.Rete.assertObject(Rete.java:177)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:201)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:858)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:659)
	at com.sample.DroolsTest.main(DroolsTest.java:21)




package com.sample;

import java.io.InputStreamReader;
import java.io.Reader;

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;

public class DroolsTest
{

    public static final void main(String[] args)
    {
        try
        {
            RuleBase ruleBase = readRule();
            WorkingMemory workingMemory = ruleBase.newStatefulSession();
            workingMemory.insert(new Attribute());
            workingMemory.insert(new Message());
            workingMemory.fireAllRules();
        }
        catch (Throwable t)
        {
            t.printStackTrace();
        }
    }

    private static RuleBase readRule() throws Exception
    {
        Reader source = new InputStreamReader(DroolsTest.class.getResourceAsStream("/Sample.drl"));
        PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl(source);
        Package pkg = builder.getPackage();
        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage(pkg);
        return ruleBase;
    }

    public static class Message
    {
        //empty
    }

    public static class Attribute
    {

        public Integer getValue()
        {
            return null;
        }

    }

}


package com.sample
 
import com.sample.DroolsTest.Message;
import com.sample.DroolsTest.Attribute;
 
rule "rule_1"
	
	when
		Message()
		Attribute(value == 1)
	then
		System.err.println("case 1");
end

rule "rule_2"
	
	when
		Message()
		Attribute(value == 2)
	then
		System.err.println("case 2");
end


rule "rule_3"
	
	when
		Message()
		$a:Attribute(value == 3)
	then
		System.err.println("case 3");
end


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