[rules-users] Hibernate proxy objects equality tests failing in Drools 5

[Guto]

Thanks Greg,

But it´s not a lazy loading problem at all. I am not using any kind of
lazy attribute inside the statefull drools session...

Unfortunelly, i´ve just upgrade from drools 4GA to 5CR1 and the problem
persist. Now I will try to make CLONES of the objects the came from the
bank, just to see if that (temporary) solution works.

>
> Do you need the lazy loading functionality that proxies provide?  It seems
> to me that if you have an EJB call that's providing the objects loaded
> from hibernate, that's probably not the case. (i.e. once the objects are
> loaded and returned by the EJB method, the hibernate session may no longer
> be available, so lazy loading could fail anyway.)  If you have access to
> the hibernate mapping just set lazy="false" on your class mappings.
>
> Not to say that this use case shouldn't be addressed with drools, but if
> you're under a deadline... :)
>
> --- On Mon, 5/4/09, Guto <guto at guto.net> wrote:
>
>> From: Guto <guto at guto.net>
>> Subject: Re: [rules-users] Hibernate proxy objects equality tests
>> failing   in Drools 5
>> To: "Rules Users List" <rules-users at lists.jboss.org>
>> Date: Monday, May 4, 2009, 2:42 PM
>> Just now I notice one thing. The application that i am
>> building is
>> compleatly EJB centric. I have um EJB project that usually
>> do all the
>> database stuff, and another EJB project for the drools
>> rules. Lets call
>> them
>> EJB-DATA and EJB-DROOLS. When the client calls for an
>> specific data that
>> must be threated thru the Drools rules it calls an
>> Stateless method from
>> EJB-DATA, inside the method, it gather the necessarie
>> parameter
>> information and them inside the EJB-DATA method it calls
>> the EJB-DROOLS.
>> (hoping not been confusing)
>>
>> (if you are using an fixed space font, here comes the
>> sequence)
>>
>> Client --> EJB-DATA (gather information inside) -->
>> EJB-DROOLS
>>        <-- return to Client data from EJB-DROOLS<--
>> return to EJB-DATA
>>
>> Now looking over my two projects, I notice that I make them
>> apart so one
>> could evolve with interfering the other.
>>
>> When I call EJB-DROOLS directly from an UNIT-TEST client
>> with pojos
>> parameters intantiated by the test, it pass.
>>
>> When I call EJB-DATA from an UNIT-TEST client (pojos
>> created inside this),
>> first i was getting an CORBA exception ´cause of a
>> ClassNotFoundException
>> for the hibernate PersistenceBag.
>>
>> That´s the way i figure out that my objects are bagged or
>> proxied thru
>> hibernate.
>>
>> I´ve tried to use the EntityManager.clear() (EJB3-JPA) to
>> clean the pojos
>> before send it and make them more like the ones from the
>> first unit-test,
>> but even so it´s not working.
>>
>> Then, possible solutions:
>> 1) Make equality test works from objects that came from
>> hibernate from jpa.
>> 2) Kill the proxies and make them simple objects (not
>> hibernate derivated).
>> 3) don´t know, but i´m been realy in a deadline here.
>>
>>
>> again
>> thanks for anyone in advance !
>>
>> --
>> Guto Maia
>> Consultor de TI / Desenvolvedor
>> CSM - SCJP- SCWCD - SCBCD - ZCE
>>
>>
>>
>>
>>
>> > In fact, i´m really using JPA with hibernate as an
>> provider.
>> >
>> > Could you send me your hibernate config? I will
>> compare some proprieties
>> > of tyour hibernate.config with my persistence.xml.
>> >
>> > I plenty sure that the rule is ok, since it is working
>> with the unit test.
>> >
>> > If you need any help to mimic what your using with
>> JPA, just ask.
>> >
>> > Thanks anyway.
>> >
>> >
>> >>
>> >> I'm using non-proxied hibernate backed POJOs
>> in drools with no problems.
>> >> (THe pojos aer generaed by hbm2java.)  I'll
>> try configuring for proxies
>> >> to
>> >> see what happens.
>> >>
>> >>
>> >> --- On Mon, 5/4/09, Gustavo Maia Neto
>> <guto at guto.net> wrote:
>> >>
>> >>> From: Gustavo Maia Neto <guto at guto.net>
>> >>> Subject: Re: [rules-users] Hibernate proxy
>> objects equality tests
>> >>> failing in Drools 5
>> >>> To: "Rules Users List"
>> <rules-users at lists.jboss.org>
>> >>> Date: Monday, May 4, 2009, 11:28 AM
>> >>> on this afternoon I will migrate to Drools 5
>> CR1,
>> >>> unfortunelly i'm not
>> >>> sure if it will solve my problem.
>> >>>
>> >>> Does anyone else uses Drools with objects that
>> came from an
>> >>> hibernate,
>> >>> (proxies)?
>> >>>
>> >>> Also, i'm not using any proxy to fetch
>> lazy data inside
>> >>> my Drools
>> >>> stateful session.
>> >>>
>> >>> thanks
>> >>>
>> >>> Guto escreveu:
>> >>> > I was following that subject on markmail,
>> and them
>> >>> I've enterred the
>> >>> > user-group (so subject and body are
>> coppied from
>> >>> them). I've got the
>> >>> > exactly same problem. When I use the
>> rules with
>> >>> objects the came from the
>> >>> > database (thru JPA hibernate provider),
>> thouse rules
>> >>> never match. When I
>> >>> > do the same from Pojos hand made for unit
>> test, it
>> >>> work.
>> >>> >
>> >>> > I don't know what really happen, but
>> i'm sure
>> >>> that it is an equality test
>> >>> > falling 'cause of the hibernate
>> proxys.
>> >>> >
>> >>> > I don't get also any kind of error or
>> exception,
>> >>> since it ALL WORK. Just
>> >>> > the rule isn't be acomplished.
>> >>> >
>> >>> > I'm using EJB3 + JPA (hibernate
>> provider) and
>> >>> Drools 4 GA;
>> >>> >
>> >>> > thanks in advance for any help
>> >>> >
>> >>>
>> >>>
>> _______________________________________________
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>> >>> rules-users at lists.jboss.org
>> >>>
>> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>
>> >>
>> >>
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>> >>
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>> >>
>> >
>> >
>> > --
>> > Guto Maia
>> > Consultor de TI / Desenvolvedor
>> > CSM - SCJP- SCWCD - SCBCD - ZCE
>> >
>> > _______________________________________________
>> > rules-users mailing list
>> > rules-users at lists.jboss.org
>> > https://lists.jboss.org/mailman/listinfo/rules-users
>> >
>>
>>
>>
>>
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-- 
Guto Maia
Consultor de TI / Desenvolvedor
CSM - SCJP- SCWCD - SCBCD - ZCE