[rules-users] 5.6.0.CR1 gives a NullPointerException in after evaluator

[abr]

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



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