@ Nikhil,

 

I am not sure weather it a good practice to seralize a package and store it , i am new to it and  i am storing the drl  files in db .

Can we retrive our DRL file after retriving the packge from database.??

 

On 5/4/10, Nikhil S. Kulkarni <Nikhil.Kulkarni@mastek.com> wrote:

Hi,

 

                I have compiled some rules and added it in packages. Then I serialized those packages and stored in database in the form of CLOB data

Now  I am able to get Packages back from database and loaded it in RuleBase.

But while executing Rule, I am getting the following Exception.

 

java.lang.NullPointerException

                at org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:91)

                at org.drools.base.evaluators.EqualityEvaluatorsDefinition$StringEqualEvaluator.evaluate(EqualityEvaluatorsDefinition.java:1962)

                at org.drools.rule.LiteralRestriction.isAllowed(LiteralRestriction.java:92)

                at org.drools.rule.OrCompositeRestriction.isAllowed(OrCompositeRestriction.java:25)

                at org.drools.rule.MultiRestrictionFieldConstraint.isAllowed(MultiRestrictionFieldConstraint.java:97)

                at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:143)

                at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:360)

                at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)

                at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)

                at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)

                at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)

                at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)

                at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)

                at org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:201)

               

                The similar kind of issue is already logged by someone.

 

Please inform If anyone has an idea about this.

Waiting for Reply.

 

Thanks & Regards,

Nikhil S. Kulkarni

 

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