Techy,
I don't know how you got this exception, but I tried to reproduce it here with 4.0.x branch and was not able to. Also, it is very strange that your exception stack has this:
org.drools.base.evaluators.IntegerFactory$IntegerLessEvaluator.evaluate(IntegerFactory.java:241)
Suggesting that you are using a "<" evaluator and not an "==" evaluator as your sample. Also, by the stack trace, it seems you are using a bound variable, not an explicit "null" constant. So definitively, it is not the rule you are showing in your e-mail bellow.
If you can get an isolated test case that can be reproduced, please open a JIRA and attach the test case and I will investigate.
[]s
Edson
2009/4/28 techy
<techluver007@gmail.com>
Hello,
For following rule, NullPointerException is thrown for null id in 4.x. is
this expected? Please clarify.
Foo{
Integer id;
}
Rule "null check"
foo : Foo(id==null)
then
end
stack trace:
java.lang.NullPointerException
at
org.drools.base.extractors.BaseObjectClassFieldExtractor.getIntValue(BaseObjectClassFieldExtractor.java:95)
at
org.drools.base.ClassFieldExtractor.getIntValue(ClassFieldExtractor.java:197)
at
org.drools.base.evaluators.IntegerFactory$IntegerLessEvaluator.evaluate(IntegerFactory.java:241)
at
org.drools.rule.VariableRestriction.isAllowed(VariableRestriction.java:73)
at org.drools.rule.VariableConstraint.isAllowed(VariableConstraint.java:67)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318)
at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162)
at org.drools.reteoo.Rete.assertObject(Rete.java:175)
at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684)
at
org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:160)
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Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com