How handle exception thrown while looping in DRL file

[ashwindrool]

Hi,

I ran enhanced for loop in .DRL file .Its looping perfectly but after completion of loop its throwing error mentioned as follows:


org.drools.runtime.rule.ConsequenceException: rule: Test Maadiiiiiiiiiiiiiiiii

        at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
        at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
        at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
        at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:737)
        at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:701)
        at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
        at com.sample.DroolsTest.main(DroolsTest.java:156)
Caused by: java.lang.NullPointerException
        at com.sample.Rule_Test_Maadiiiiiiiiiiiiiiiii_0.defaultConsequence(Rule_Test_Maadiiiiiiiiiiiiiiiii_0.java:7)
        at com.sample.Rule_Test_Maadiiiiiiiiiiiiiiiii_0DefaultConsequenceInvoker.evaluate(Rule_Test_Maadiiiiiiiiiiiiiiiii_0DefaultConsequenceInvoker.java:27)
        at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
        ... 6 more

[laune]

Thanks for telling us.
-W


On 17/07/2012, ashwindrool <[hidden email]> wrote:

> Hi,
>
> I ran enhanced for loop in .DRL file .Its looping perfectly but after
> completion of loop its throwing error mentioned as follows:
>
>
> *org.drools.runtime.rule.ConsequenceException: rule: Test
> Maadiiiiiiiiiiiiiiiii
>
> at
> org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
> at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
> at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
> at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:737)
> at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:701)
> at
> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
> at com.sample.DroolsTest.main(DroolsTest.java:156)
> Caused by: java.lang.NullPointerException
> at
> com.sample.Rule_Test_Maadiiiiiiiiiiiiiiiii_0.defaultConsequence(Rule_Test_Maadiiiiiiiiiiiiiiiii_0.java:7)
> at
> com.sample.Rule_Test_Maadiiiiiiiiiiiiiiiii_0DefaultConsequenceInvoker.evaluate(Rule_Test_Maadiiiiiiiiiiiiiiiii_0DefaultConsequenceInvoker.java:27)
> at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
> ... 6 more
> *
>
> --
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[ashwindrool]

Thnks for Replying ,

Plz give some idea in above issue.  

[manstis]

You haven't asked any questions, merely stated you have an error message.

Try posting some supporting code (DRL, related Java etc) it might help people.

On 17 July 2012 10:03, ashwindrool <[hidden email]> wrote:

Thnks for Replying ,

Plz give some idea in above issue.

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[ashwindrool]

Sorry Mike,Laune


I am handling 100thousand records for that i am using CSV file and converting those records into objects which i am using for further calculation.

According to my requirement i have loop array inside DRL file

So i wrote following code in .java
 agCsv.setPolCounterList(polCounterList);
 agCsv.setAgentList(agentListArray);
 
     // local block end for policy---------------------------------------
     //firing  all rules from here-------------
           ksession.fireAllRules();
        //after firing rules destroying session object
           ksession.dispose();
         

after this  i am executing following rule DRL file

rule "Loop Test"
    salience 50
        when
       
        $a:AgentCSVBean()
       
       
        then
         
          for(Integer agentList: $a.getAgentList()) {
           
           System.out.println("--sam====="+agentList);
       
      }
   
   
               
end

Now above loop execute absolutely well but after finishing loop it throws Error




 

[manstis]

When you say the loop works fine, do the System.out's print what you expect?

On 17 July 2012 10:34, ashwindrool <[hidden email]> wrote:

Sorry Mike,Laune


I am handling 100thousand records for that i am using CSV file and
converting those records into objects which i am using for further
calculation.

According to my requirement i have loop array inside DRL file

So i wrote following code in .java
* agCsv.setPolCounterList(polCounterList);
 agCsv.setAgentList(agentListArray);

                  // local block end for policy---------------------------------------
                  //firing  all rules from here-------------
                        ksession.fireAllRules();
                     //after firing rules destroying session object
                        ksession.dispose();
                        *

after this  i am executing following rule DRL file

*rule "Loop Test"
    salience 50
        when

        $a:AgentCSVBean()


        then

          for(Integer agentList: $a.getAgentList()) {

           System.out.println("--sam====="+agentList);

      }



end*

Now above loop execute absolutely well but after finishing loop it throws
Error











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[ashwindrool]

Yes Mike,

I am getting expected output but after completion of loop it throws error

[laune]

Add an if statement testing for a List element being null, e.g.,

   for( Integer agentList: $a.getAgentList()) {
        if( agentList != null ){
           System.out.println("--sam====="+agentList);
       } else {
          System.out.println( "null element in list" );
      }
    }

-W


On 17/07/2012, ashwindrool <[hidden email]> wrote:

> Yes Mike,
>
> I am getting expected output but after completion of loop it throws error
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/How-handle-exception-thrown-while-looping-in-DRL-file-tp4018727p4018733.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
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[ashwindrool]

Thnks Laune for ur reply but i tried that condition part even than also its coming up with same error

[laune]

Add println() before and after the for(){...} statement. What is the output?

How many AgentCSVBean() are inserted?
Could one of these have a field agentLsit that is null?

-W

On 17/07/2012, ashwindrool <[hidden email]> wrote:

> Thnks Laune for ur reply but i tried that condition part even than also its
> coming up with same error
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/How-handle-exception-thrown-while-looping-in-DRL-file-tp4018727p4018736.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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>

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[ashwindrool]

Hi Laune,


I do wht u asked me, I added print statement before and after for loop


       
          System.out.println("Before");
          for(Integer agentList: $a.getAgentList()) {
          System.out.println("-==========-");
             if($a.getAgentList() != null ){
  System.out.println("--sam====="+agentList);
     }
     else{
     System.out.println("null");
     }
    }
     System.out.println("after");
   
   "Before" is getting printed twice and "After" only once.Then it prints Error message which i mentioned in catch block from where i called rule in java.

   in following order message getting printed
    before
   list of data
   after
   before
   error

im printing 128thousand records

No their is no null field in given records...................  

               

[laune]

On 17/07/2012, ashwindrool <[hidden email]> wrote:
> Hi Laune,
>
>
> I do wht u asked me, I added print statement before and after for loop
>
>
>
>    "Before" is getting printed twice and "After" only once.

Like this????
Before
Before
After
---Error message---

Please be more specific.

Add another if statement before the for statement testing whether
 if(  $a.getAgentList() == null ){
     System.out.println( "List is null" );
}


Then it prints

> Error message which i mentioned in catch block from where i called rule in
> java.
>
>    in following order message getting printed
>    * before
>    list of data
>    after
>    before
>    error*
>
> /im printing 128thousand records/
> *
> No their is no null field in given records...................
> *
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/How-handle-exception-thrown-while-looping-in-DRL-file-tp4018727p4018738.html
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[ashwindrool]

HI Laune ,

I did required changes in code by adding if condition before for loop

System.out.println("Before");
           if($a.getAgentList() != null ){
  System.out.println("--sameeeeeeeeee=====");
     }
          for(Integer agentList: $a.getAgentList()) {
          System.out.println("-==========-");
             if($a.getAgentList() != null ){
  System.out.println("--sam====="+agentList);
     }
     else{
     System.out.println("null");
     }
    }
     System.out.println("after");


Now Execution order is
 first "Before" is getting printed
 thn  "Sameeeeeeeee"
 followed by "============="
         "after"
         "Before"
         "errrrrr"

[laune]

Is this exactly (!) what you have in your rule, between 'when' and 'then'?
     when
        $a:AgentCSVBean()
     then
-W



On 17/07/2012, ashwindrool <[hidden email]> wrote:

> HI Laune ,
>
> I did required changes in code by adding if condition before for loop
>
> *System.out.println("Before");
>   if($a.getAgentList() != null ){
>   System.out.println("--sameeeeeeeeee=====");
>      }
>  for(Integer agentList: $a.getAgentList()) {
>  System.out.println("-==========-");
>     if($a.getAgentList() != null ){
>   System.out.println("--sam====="+agentList);
>      }
>      else{
>      System.out.println("null");
>      }
>     }
>      System.out.println("after");*
>
>
> Now Execution order is
>  f*irst "Before" is getting printed
>  thn  "Sameeeeeeeee"
>  followed by "============="
>          *"after"
>          "Before"
>          "errrrrr"**
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/How-handle-exception-thrown-while-looping-in-DRL-file-tp4018727p4018740.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> [hidden email]
> https://lists.jboss.org/mailman/listinfo/rules-users
>

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