[jboss-jira] [JBoss JIRA] Updated: (JBRULES-627) null pointer with number comparison..
[ http://jira.jboss.com/jira/browse/JBRULES-627?page=all ]
Thomas Meeks updated JBRULES-627:
---------------------------------
Attachment: patch
I have created a patch to fix this issue.
The patch will resolve any lingering issues of primitive / wrapper comparison, including
comparing primitives to null wrappers and wrappers to null. Drools will still throw a NPE
when a primitive is compared to a null wrapper with >, <, >= or <= -- as such
an operation can have no reasonable result in this context.
The correct usage is to check objects against null before comparing them to a primitive.
null pointer with number comparison..
-------------------------------------
Key: JBRULES-627
URL: http://jira.jboss.com/jira/browse/JBRULES-627
Project: JBoss Rules
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 3.0.4
Environment: Windows XP or Solaris
Sun JDK 1.4.2
Drools 3.0.4 distribution
Reporter: Sachin Holla
Assigned To: Mark Proctor
Attachments: patch
getting a null pointer while asserting fact:
Caused by: java.lang.NullPointerException
at org.drools.base.evaluators.IntegerFactory$IntegerGreaterEvaluator.evaluate(Unknown
Source)
at org.drools.rule.BoundVariableConstraint.isAllowed(Unknown Source)
at org.drools.common.BetaNodeBinder.isAllowed(Unknown Source)
at org.drools.reteoo.TupleSource.attemptJoin(Unknown Source)
at org.drools.reteoo.JoinNode.assertTuple(Unknown Source)
at org.drools.reteoo.LeftInputAdapterNode.createAndAssertTuple(Unknown Source)
at org.drools.reteoo.LeftInputAdapterNode.assertObject(Unknown Source)
at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)
at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
at org.drools.reteoo.Rete.assertObject(Unknown Source)
at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)
at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
Rule is something like this:
rule "Greater Than with NULL number!!"
when
MyFact ( integerAttribute > 10 )
then
.....
end
the *intergerAttribute* is of type java.lang.Integer and value is *null*.
no such problem if expression changed to *integerAttribute == 10* or !=
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