[rules-users] Template rules & eval

[Bertrand Grottier]

Hello,

I want to use template rules. Here is my .drt file:

template header
ddeb
dfin
prix

package com.tarification

import java.util.Date ;

import tarification.Produit ;
import java.text.SimpleDateFormat;

function Date getDate(String pStrDate)
{
    SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
    return sdf.parse(pStrDate) ;
}

template "tarification_produit"

rule "Periode@{row.rowNumber}"
    when
        $p : Produit(id == 1, eval( dDeb.before( getDate("@{ddeb}") ) ) )
    then
        $p.setId(2) ; 
        $p.setPrix(@{prix}) ;
        update( $p );        
end
end template


I modified an example provided with Drools but encounter the following exception:

Exception in thread "main" org.drools.RuntimeDroolsException: Exception executing predicate com.tarification.Rule_Periode2_0Predicate0Invoker at 2110b61d
    at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:279)
    at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:143)
    at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
    at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
    at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
    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 tarification.TestTemplate.executeExample(TestTemplate.java:49)
    at tarification.TestTemplate.main(TestTemplate.java:26)
Caused by: java.lang.NullPointerException
    at com.tarification.Rule_Periode2_0.predicate0(Rule_Periode2_0.java:9)
    at com.tarification.Rule_Periode2_0Predicate0Invoker.evaluate(Rule_Periode2_0Predicate0Invoker.java:23)
    at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:272)
    ... 11 more

I am puzzle because when I copy the drl generated string in a drl file, everything works fine.

Any idea ? Thank you in advance.

Regards,
Benoît

 		 	   		  
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