users@glassfish.java.net

Re: Persistence Units lookup method in Glassfish

From: Sahoo <Sahoo_at_Sun.COM>
Date: Sat, 18 Jul 2009 13:40:22 +0530

Your war layout looks correct as long as you use different unit names. I
suggest, you run verify your application like this once:

verifier W.war

Sahoo
glassfish_at_javadesktop.org wrote:
> Hello,
>
> In Eclipse I'm having a web application (call it W) and a separate project(call it P) added to it as a J2EE module dependencie.
>
> So P.jar goes finally into WEB-INF/lib of my web app W.
>
> In W i have a persistence unit (called "inclasses") represented by
> - some @entity classes: A and B (who will go in WEB-INF/classes),
> - a persistence.xml file (who will go in WEB-INF/classes/META-INF)
> - and some DAOs having @PersistenceContext.
>
> In P i have a persistence unit (called "injar") represented by
> - some @entity classes: C and D (who will go in WEB-INF/lib/P.jar),
> - a persistence.xml file (who will go in WEB-INF/lib/P.jar/META-INF)
>
> In both persistence.xml i have a <provider> pointing at Hibernate.
>
> I made some experiments with my DAOs giving them different unitName:
> - "inclasses"
> - "injar"
> - no unitName specified
>
>
>
> In the first case it takes into account A and B and also the inner configuration of persistence.xml found in /classes/META-INF
>
> In the second case it takes into account C and D BUT not the inner configuration of persistence.xml found in /lib/p.jar/META-INF. It takes the default TopLink provider and the default datasource of Glassfish (the datasource for derby on port 1527)
>
> Finally in the las case it cannot deploy saying that several persistence units exist and it does not know which to choose.
>
> I'm on Glassfish 2.1
>
> Question; what is the normal behaviour in this case of strucuture of my war?
> Pls. send me to some doc which explains this well.
>
> Also what would happen if both persistence.xml would have the same name: let's say "idem".
>
> PS: i already read the EJB3.0 persistence spec about the # syntax, but that is not about my case.
> [Message sent by forum member 'vladbalan' (vladbalan)]
>
> http://forums.java.net/jive/thread.jspa?messageID=356310
>
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