[jboss-jira] [JBoss JIRA] Created: (JBRULES-854) I have following problem with null valuated string properties

[Vesa Tuononen (JIRA)]

I have following problem with null valuated string properties
-------------------------------------------------------------

                 Key: JBRULES-854
                 URL: http://jira.jboss.com/jira/browse/JBRULES-854
             Project: JBoss Rules
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Reteoo
    Affects Versions: 4.0.0.MR2
         Environment: Windows XP SP2

            Reporter: Vesa Tuononen
         Assigned To: Mark Proctor
            Priority: Blocker


I have very simple object with PropertyChangeSupport. 

Java code listed bellow object and test method:

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.InputStreamReader;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.StatefulSession;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;

public class OwnTest{
	public static class Row{
		private final PropertyChangeSupport changes  = new PropertyChangeSupport( this );
		private String field1;
		private String field2;
		
		public Row(){}
		
		public String getField1() {
			return field1;
		}
		public void setField1(String field1) {
			String oldField1 = this.field1;
			this.field1 = field1;
	        this.changes.firePropertyChange( "field1",
	        		oldField1,
                    this.field1 );
		}
		public String getField2() {
			return field2;
		}
		public void setField2(String field2) {
			String oldField2 = this.field2;
			this.field2 = field2;
	        this.changes.firePropertyChange( "field2",
	        		oldField2,
                    this.field2 );
		}

		
	    public void addPropertyChangeListener(final PropertyChangeListener l) {
	        this.changes.addPropertyChangeListener( l );
	    }

	    public void removePropertyChangeListener(final PropertyChangeListener l) {
	        this.changes.removePropertyChangeListener( l );
	    }
	}

	/**
	 * @param args
	 * @throws Exception 
	 * @throws DroolsParserException 
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
        Row r = new Row();
        r.setField1(null);
        r.setField2(null);
        PackageBuilder builder = new PackageBuilder();
		builder.addPackageFromXml(new InputStreamReader( OwnTest.class.getResourceAsStream("rule.xml")));
        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        StatefulSession workingMemory = ruleBase.newStatefulSession();    
        workingMemory.assertObject(r, true);
        workingMemory.fireAllRules();
	}
}

and rule.xml
<?xml version="1.0" encoding="UTF-8"?> 
 <package name="test"  
	xmlns="http://drools.org/drools-3.0" 
	xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" 
	xs:schemaLocation="http://drools.org/drools-3.0 drools-3.0.xsd"> 
<import name="OwnTest.Row"/> 
<rule name="1">
<lhs>
<pattern object-type="Row">
   <field-constraint field-name="field1"> 
   <literal-restriction evaluator="==" value="1" />
   </field-constraint>
</pattern>
</lhs>
<rhs>
System.out.println("--"+input.getField1());
input.setField1("2");
</rhs>
</rule>
<rule name="2">
<lhs>
<pattern identifier="input" object-type="Row">
   <field-constraint field-name="field1"> 
   <literal-restriction evaluator="==" value="2" />
    </field-constraint>
</pattern>
</lhs>
<rhs>
System.out.println("--"+input.getField1());
input.setField1("3");
</rhs>
</rule>
<rule name="3">
<lhs>
<pattern identifier="input" object-type="Row">
   <field-constraint field-name="field1"> 
   <literal-restriction evaluator="==" value="3" />
    </field-constraint>
</pattern>
</lhs>
<rhs>
System.out.println("--"+input.getField1());
input.setField1("4");
</rhs>
</rule>
<rule name="4">
<lhs>
<pattern identifier="input" object-type="Row">
   <field-constraint field-name="field1"> 
   <literal-restriction evaluator="==" value="4" />
    </field-constraint>
</pattern>
</lhs>
<rhs>
System.out.println("--"+input.getField1());
input.setField1("0");
input.setField2("5");
</rhs>
</rule>
<rule name="5">
<lhs>
<pattern identifier="input" object-type="Row">
   <field-constraint field-name="field2"> 
   <literal-restriction evaluator="==" value="2" />
    </field-constraint>
</pattern>
</lhs>
<rhs>
System.out.println("--"+input.getField1());
System.out.println("--"+input.getField2());
input.setField2("2b");
</rhs>
</rule>
</package>

with this rule set I get following StackTrace:
Exception in thread "main" java.lang.NullPointerException
	at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.setValue(CompositeObjectSinkAdapter.java:478)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:292)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:183)
	at org.drools.reteoo.Rete.assertObject(Rete.java:121)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:201)
	at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:70)
	at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:724)
	at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:568)

but if I remove some rules everything works fine.

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