Re: [rules-users] NullPointerException for Integer null
You are right Edson.
I also have another rule with less salience value that does < comparison. my
attention was completely on first rule which does null check and thinking
that was causing the issue :(. Good find and thanks again for the help.
Edson Tirelli-3 wrote:
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$IntegerLessEvaluator.evaluate(IntegerFactory.java:241)
Suggesting that you are using a "<" evaluator and not an "=="
evaluator
as your sample. Also, by the stack trace, it seems you are using a bound
variable, not an explicit "null" constant. So definitively, it is not the
rule you are showing in your e-mail bellow.
If you can get an isolated test case that can be reproduced, please
open
a JIRA and attach the test case and I will investigate.
[]s
Edson
2009/4/28 techy <techluver007(a)gmail.com>
>
> Hello,
> For following rule, NullPointerException is thrown for null id in 4.x.
> is
> this expected? Please clarify.
>
> Foo{
> Integer id;
> }
> Rule "null check"
> foo : Foo(id==null)
> then
> end
>
> stack trace:
> java.lang.NullPointerException
> at
>
>
org.drools.base.extractors.BaseObjectClassFieldExtractor.getIntValue(BaseObjectClassFieldExtractor.java:95)
> at
>
> org.drools.base.ClassFieldExtractor.getIntValue(ClassFieldExtractor.java:197)
> at
>
>
org.drools.base.evaluators.IntegerFactory$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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>
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>
--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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