[rules-users] Template rules & eval

[Enda J Diggins]

You're getting a NullPointer in the predicate... is dDeb null?

Enda

2010/3/10 Wolfgang Laun <wolfgang.laun at gmail.com>

> All I can see is that the date string is the same in Periode1 and Periode2,
> so you must have the same date in lines 1 and 2, which won't work well, but
> is perhaps due to simplification?
> -W
>
>
>
> 2010/3/10 Bertrand Grottier <b_grottier at hotmail.com>
>
>>  Here is the "drl generated string":
>>
>>
>> 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) ;
>> }
>>
>> rule "Periode2"
>>     when
>>         $p : Produit(id == 1, eval( dDeb.before( getDate("01/06/2010") ) )
>> )
>>     then
>>         $p.setId(2) ;
>>         $p.setPrix(100) ;
>>         update( $p );
>> end
>>
>> rule "Periode1"
>>     when
>>         $p : Produit(id == 1, eval( dDeb.before( getDate("01/06/2010") ) )
>> )
>>     then
>>         $p.setId(2) ;
>>         $p.setPrix(50) ;
>>         update( $p );
>> end
>>
>>
>> > Date: Wed, 10 Mar 2010 11:41:36 +0100
>> > From: wolfgang.laun at gmail.com
>> > To: rules-users at lists.jboss.org
>> > Subject: Re: [rules-users] Template rules & eval
>>
>> >
>> > Can you post the "drl generated string" you are referring to?
>> > -W
>> >
>> > 2010/3/10 Bertrand Grottier <b_grottier at hotmail.com>:
>> > > 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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-- 
Enda J Diggins
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