Details
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Bug
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Resolution: Done
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Major
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5.4.0.CR1
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None
Description
I have a rule with this element in the when clause:
$beforePrediction : Number() from accumulate(
JobSlot(job != NULL_JOB, $j : job, $service == service, $ordinal > ordinal) and $p : Prediction(job == $j, service == $service),
sum($p.getMillisMid())
)
When I execute this I have cases where there are no matching Prediction instances, so the sum is zero. Later on retract, I get this:
Caused by: java.lang.NullPointerException: null at org.drools.base.accumulators.SumAccumulateFunction.reverse(SumAccumulateFunction.java:83) at org.drools.base.accumulators.JavaAccumulatorFunctionExecutor.reverse(JavaAccumulatorFunctionExecutor.java:130) at org.drools.rule.Accumulate.reverse(Accumulate.java:208)
The relevant code is this:
public void accumulate(Serializable context,
Object value) {
SumData data = (SumData) context;
data.total += ((Number) value).doubleValue();
}
and this:
public void reverse(Object workingMemoryContext,
Object context,
Tuple leftTuple,
InternalFactHandle handle,
Declaration[] declarations,
Declaration[] innerDeclarations,
WorkingMemory workingMemory) throws Exception {
final Object value = ((JavaAccumulatorFunctionContext) context).reverseSupport.remove( Integer.valueOf( handle.getId() ) );
this.function.reverse( ((JavaAccumulatorFunctionContext) context).context,
value );
}
A breakpoint reveals that handle is a Prediction instance. Somehow that handle was not added to reverseSupport, apparently.
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