In the past I've tried to reproduce a similar issue.
Don't know if this will help, but I could not reproduce the NPEs without
running a large amount of events into the rule engine. A small unit test never
reproduced these issues for me, which made it harder. Not sure about this issue
in particular, but other ones I've seen seem to be related to the internal hash
table eventually misplacing objects. This created all sorts of odd symptoms,
namely NPEs all over the place in random drools classes. But I think all of
these are just symptoms of the same bug at the core level somewhere. They all
are related IMO.
Sent from my iPhone
> On Nov 18, 2013, at 9:48 AM, Davide Sottara <dso...@gmail.com> wrote:
>
> I tried to reproduce the problem, with no success.
> Could you please create a self-contained unit test?
> If confirmed, I'll fix the problem as soon as possible
> Thanks
> Davide
>
>> On 11/14/2013 04:48 AM, abr wrote:
>> Hi everyone,
>>
>> I tried to switch from 5.5.0.Final to 5.6.0.CR1 and got a null pointer
>> exception in the evaluation of the after evaluator.
>> (Exact method is:
>> /org.drools.base.evaluators.AfterEvaluatorDefinition.AfterEvaluator.evaluate(InternalWorkingMemory,
>> InternalReadAccessor, InternalFactHandle, InternalReadAccessor,
>> InternalFactHandle)/ )
>>
>> When debugging, the exception occurs at the very first line of the method,
>> in:
>> / if ( extractor1.isNullValue( workingMemory, handle1.getObject() ) ||
>> extractor2.isNullValue( workingMemory, handle2.getObject() ) ) {
>> return false;
>> }
>> /
>> The cause of the exception is that handle1 is null.
>>
>> The rule where the exception occurs looks like:
>> / MyFact(
>> fromdate before[ 0d ] $min,
>> ( todate == null || todate after[ 0d ] $max ) )
>> /
>>
>> When the exception occurs, /MyFact.fromdate/ is not null, /$min/ is not
>> null, /MyFact.todate/ is null, /$max/ is not null.
>> In AfterEvaluator.evaluate : /extractor1/ refers to /MyFact.todate/,
>> /extractor2/ refers to /$max/, /handle1/ is null, /handle2/ refers to the
>> fact including the attribute to which /$max/ variable is bound to.
>>
>> Of course, this worked fine in 5.5.0.Final.
>> I couldn't test this out in Drools 6.0.0.CR5 because I have dependencies to
>> drools-spring JAR that does not exist anymore in 6.0.0.CR5.
>>
>> Is it simple to fix this problem?
>>
>> Thanks in advance.
>>
>> Best,
>> Alexis
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/5-6-0-CR1-gives-a-NullPointerException-in-after-evaluator-tp4026780.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>
> _______________________________________________
> rules-users mailing list
> rules-users@lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
_______________________________________________
rules-users mailing list
rules-users@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
