[rules-users] org.drools.RuntimeDroolsException when inserting into Knowledge Session

[Jaroslaw Kijanowski]

Hi,
  before you insert any facts, make sure you set all globals used in 
your rules.

Cheers,
  Jarek

Abarna Ramachandran wrote:
> I am getting the following error when trying to insert my object into 
> ksession. I have attached my rules and java object. Please help me in 
> debugging why this is happening. I am using java 5 and drools 5.0
> 
> thanks
> 
> *error while inserting:*
> 
> org.drools.RuntimeDroolsException:
> defaultpkg.Rule_CheckStationNumber_0Eval0Invoker at e4aea391 : 
> java.lang.NullPointerException
> 
> *rules.drl*
> import java.lang.*;
> import java.util.*;
> import ct.fw.rules.*;
> import ct.fw.utils.*;
> import ct.fw.rules.*;
> import ct.fw.logging.*;
> import ct.fw.pf.dbi.*;
> import ct.fw.pf.dao.*;
> import ct.fw.pf.seq.*;
> import ct.fw.pf.util.*;
> import ct.fw.pf.vo.*;
> import ct.fw.ex.*;
> import org.apache.commons.lang.*;
> import com.aa.gccp.domain.*;
> 
>    global ct.fw.rules.AssertionObject ao
>    global ct.fw.logging.SmartLogger log
>        
>     function BillingRecord getRecord(AssertionObject ao)
>         {
>             return (BillingRecord) ao.get(0);
>         }
>     function void debug(String msg,SmartLogger log)
>         {
>             log.debug(BusinessRulesValidator.class, msg);
>         }
>     function void error(String msg,SmartLogger log)
>         {
>             log.error(BusinessRulesValidator.class, msg);
>             System.out.println("Message from rules "+msg);
>         }
>  
> rule CheckTrue
> when
>    eval(true)
> then
>     System.out.println("evaluating true");
> end
> 
> rule CheckTrue2
> when
>    eval(true)
> then
>     error("evaluating from rules2",log);
> end
> 
> rule CheckStationNumber
> when
>    eval(((getRecord(ao)).getStationNo()) == null)
> then
>     error("station number should not be null",log);
> end
> 
> *part where i load the rules and insert the facts. There is no error 
> when loading the rules.drl. That means no parsing errors. The error 
> happens at ksessio.insert(assertionObject).*
> 
> public void assertRulesObject(AssertionObject assertionObject) throws 
> BusinessRuleException
>     {
>         long current = System.currentTimeMillis();
>         KnowledgeBase kbase = knowledgeBasesMap.get(rulesFileName);
> 
>         if (kbase == null)
>         {
>             kbase = knowledgeBasesMap.get(rulesFileName + DRL);
>         }
> 
>         if ((kbase == null) || ((current - lastRefreshedMilliseconds) > 
> refreshTimeMilliseconds))
>         {
>             if (rulesFileName.toLowerCase().indexOf(DRL) == -1)
>             {
>                 kbase = load(rulesFileName + DRL);
>             }
>             else
>             {
>                 kbase = load(rulesFileName);
>             }
> 
>             lastRefreshedMilliseconds = System.currentTimeMillis();
>         }
>         this.assertionObject = assertionObject;
> 
>         List assertionobjectslist = new ArrayList();
> *// i am just doing this part just to make sure assertion object is not 
> null and i will get some answer. this part runs fine.  *   
>   if (assertionObject != null)
>         {
>             assertionobjectslist = assertionObject.getValidationObjects();
>             String StationNumber = ((BillingRecord) 
> assertionObject.get(0)).getStationNo();
>             System.out.println("Station Number in assertion object is " 
> + StationNumber);
>         }
>         else
>         {
>             System.out.println("Assertion Object is null");
>         }
>         System.out.println("The number of objects in assertionobject is 
> " + assertionobjectslist.size());
> 
>         try
>         {
>             StatefulKnowledgeSession ksession = 
> kbase.newStatefulKnowledgeSession();
> *//the next line throws the exception*
>             ksession.insert(assertionObject);
> 
>             ksession.fireAllRules();
>             ksession.dispose();
> 
>         }
>         catch (RuntimeDroolsException e1)
>         {
>             throw new BusinessRuleException(e1.getMessage());
>         }
> 
>         businessRulesErrors = assertionObject.getBusinessRulesErrors();
> 
>         if (throwException)
>         {
>             if (!assertionObject.getBusinessRulesErrors().isEmpty())
>             {
>                 throw new BusinessRuleException(businessRulesErrors);
>             }
>         }
>     }
> 
> 
> Any help is appreciated. thanks
> 
> 
> ------------------------------------------------------------------------
> 
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