[rules-users] NPE on DecisionTable rule

[Hehl, Thomas]

Hey, gang!

 

I have a decision table that generated the following rule:

 

{other rules removed}

#From row number: 19

rule "postponePart_19"

      

      when

            PoolInfo(courtLocation == "101")

            PoolInfo(statusCode >= 0, statusCode <= 2)

            PoolInfo(numberFta < 1)

            PoolInfo(numberOfDeferralsPosted < 2)

            PoolInfo(daysBeforeSummons>= 2, daysBeforeSummons<= 999)

      then

            answer.setAnswer(true);

end

 

 

I call these rules with the following code (I build the ruleBase at the
beginning in the factory method to be used by everything:

 

            StatelessSession session =
participantRuleBase.newStatelessSession();

            

            //now create some test data

            PoolInfo pool = part.getActivePool();

            BooleanAnswer answer = new BooleanAnswer();

            

            Object[] rules = new Object[]{pool, answer};

            session.execute(rules);

            

            return answer.isTrue();

 

BooleanAnswer is simply a convenience object I created to store the answer
from the rules. (If anyone has a better way to do this, please let me know.)

 

I got the following stack trace:

 

 

java.lang.NullPointerException

      at
com.acs.gs.juror.bo.Rule_postponePart_19_0.consequence(Rule_postponePart_19_
0.java:6)

      at
com.acs.gs.juror.bo.Rule_postponePart_19_0ConsequenceInvoker.evaluate(Rule_p
ostponePart_19_0ConsequenceInvoker.java:20)

      at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:545)

      at
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:509)

      at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:430)

      at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j
ava:402)

      at
org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java
:128)

 

 

I'm a newbie and have no idea what to do next. Please help.

 

Thanks.

Thom Hehl
Sr. eJuror Architect

* Office (859) 277-8800 x 144

* Thomas.Hehl at acs-inc.com <mailto:Thomas.Hehl at acs-inc.com>  
ACS, Inc.

Government Solutions

1733 Harrodsburg Road
Lexington, KY 40504-3617

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Thank you.

 

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