You can't modify bobject, becuase it doesn't exist inside the session. You just created it a few lines above. Maybe you need an insert() or maybe you need the bobject reference from the LHS. Something like this:

rule "prod"

     

      when 

         $a :A(Type == "Prod" , objectB != "")

      then

   B bobject = new B();   

         $a.getObjectB().setType( "Prod" );   

         $a.getObjectB().setId($a.getNumber().getId());   

         update($a);           

      end


Note that you need to update $a and not B, because A is the inserted Fact in your session.

Best,


2010/6/3 Fnu Mahalakshmi <FMahalakshmi@nyx.com>

Hi,

 

I am getting the following error when I try to do complex object referencing in drools:

My class:

A{

String Type;

B objectb;

//getters and setters for above

}

 

My rules:

 

rule "prod"

     

      when 

     $a :A(Type == "Prod" , objectB != "")

      then

B bobject = new B();   

     bobject.setType( "Prod" );         

     bobject.setId($a.getNumber().getId());   

     update(bobject);

           

end

 

I want to basically output a file which has updated values of B (type, Id)

 

Error:

org.drools.spi.ConsequenceException: org.drools.FactException: Update error: handle not found for object: com.org.Ip@f42ad0. Is it in the working memory?

      at org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:13)

      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:558)

      at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:518)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:475)

      at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:439)

      at com.org.DroolsTest.main(DroolsTest.java:30)

Caused by: org.drools.FactException: Update error: handle not found for object: com.org.Ip@f42ad0. Is it in the working memory?

      at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:100)

      at com.org.Rule_Prod_Ip_0.consequence(Rule_Prod_Ip_0.java:10)

      at com.org.Rule_Prod_Ip_0ConsequenceInvoker.evaluate(Rule_Prod_Ip_0ConsequenceInvoker.java:22)

      at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)

      ... 4 more

 

Please help! I am very new to drools! Not able to figure out why this error:

 

I am using eclipse and working on Windows machine. Error above was generated on eclipse console.

 

Thank you.

 

M






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