[jboss-jira] [JBoss JIRA] Created: (JBRULES-2419) Using an undefinied accumulate function should give a clear error warning instead of a NullPointerException

[Geoffrey De Smet (JIRA)]

Using an undefinied accumulate function should give a clear error warning instead of a NullPointerException
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                 Key: JBRULES-2419
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2419
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler (expert)
    Affects Versions: 5.0.1.FINAL
            Reporter: Geoffrey De Smet
            Assignee: Edson Tirelli
            Priority: Minor


Reproduced on with Micheals project with Drools 5.0.1

I got this error:
{code}
Exception caught while executing action: org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteAssertAction at 1a5e68a
java.lang.NullPointerException
	at org.drools.base.accumulators.JavaAccumulatorFunctionExecutor.createContext(JavaAccumulatorFunctionExecutor.java:82)
	at org.drools.rule.Accumulate.createContext(Accumulate.java:122)
{code}

when I wrote this rule for him:

{code}
rule "rewardLowestNonFree"
    when
        $lowestAppsSize : Number() from accumulate(
            AppServerInstance(apps.size != 0, $appsSize : apps.size),
            lowest($appsSize) // Vote for http://jira.jboss.com/jira/browse/JBRULES-1075
        );
    then
        insertLogical(new IntConstraintOccurrence("rewardLowestNonFree", ConstraintType.POSITIVE, - $lowestAppsSize.intValue()));
end
{code}


Turns out the "lowest" function doesn't exist. (I should have used "min" btw)

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