[rules-users] Getting an Error While Executing Rule in Drools 5.0

[Puneet duggal]

@ 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 at 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
>
>
>
>
>
> MASTEK LTD.
> Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
> In the US, we're called MAJESCOMASTEK
>
>
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