[jboss-jira] [JBoss JIRA] Created: (JBRULES-548) NPT when binding a variable and comparing that variable to another property of the same object the variable was bound from
NPT when binding a variable and comparing that variable to another property of the same
object the variable was bound from
---------------------------------------------------------------------------------------------------------------------------
Key: JBRULES-548
URL: http://jira.jboss.com/jira/browse/JBRULES-548
Project: JBoss Rules
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: Reteoo
Affects Versions: 3.0.4
Environment: Windows 2000
Sun JDK 1.5.0_02
Reporter: ELCA SII
Assigned To: Mark Proctor
Fix For: 3.0.5
I want to have a rule that compares one property of an object with another one of the same
object.
Sample Object:
<snip>
public class TestDomainObject {
public TestDomainObject() {
}
public Integer getValueX() {
return new Integer(200);
}
public Integer getValueY() {
return new Integer(300);
}
}
</snip>
I have the following rule in NRL:
<snip>
rule "Rule2"
when
TestDomainObject( y : valueY, valueX < y )
then
System.out.println("valueX < valueY");
end
</snip>
or XML:
<snip>
<rule name="rule2.B">
<lhs>
<column object-type="TestDomainObject" identifier="p2">
<literal field-name="type" evaluator="=="
value="invoice"/>
<field-binding field-name="valueY" identifier="v1"/>
<bound-variable field-name="valueX" evaluator="<="
identifier="v1"/>
</column>
</lhs>
<rhs>
System.out.println("rule 2.B valueX <= valueY");
</rhs>
</rule>
</snip>
And this leads to the following exception (3.0.4 and 3.0.x branch head):
<snip>
java.lang.NullPointerException
at org.drools.rule.BoundVariableConstraint.isAllowed(BoundVariableConstraint.java:79)
at org.drools.common.BetaNodeBinder.isAllowed(BetaNodeBinder.java:63)
at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)
at org.drools.reteoo.ObjectSource.propagateAssertObject(ObjectSource.java:119)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:138)
at org.drools.reteoo.ObjectSource.propagateAssertObject(ObjectSource.java:119)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:158)
at org.drools.reteoo.Rete.assertObject(Rete.java:120)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:180)
at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(ReteooWorkingMemory.java:69)
at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:538)
at org.drools.common.AbstractWorkingMemory.assertObject(AbstractWorkingMemory.java:374)
...
</snip>
In the code at
- org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)
the call
- this.binder.isAllowed( handle, null, workingMemory )
is made (in the case the binder is not null). For the second parameter (tuple),
'null' is passed explicitly.
later in the calling stack at:
- org.drools.rule.BoundVariableConstraint.isAllowed(BoundVariableConstraint.java:79)
the following call is made:
- tuple.get(...)
=> But the for the 'tuple' 'null' was passed in beforehand
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