Persistence Layer deployed as Optional Package

Question

Environment:
- WebLogic 11g which consequently means EJB 3.0
- Application has 3 modules: Web (referencing EJB and Persistence), EJB (referencing Persistence) and Persistence
Could I deploy my persistence layer as an Optional Package or does it have to be a Shared Library?
The reason I'm asking is that when I try to deploy my EJB module, WLS can't find the persistence unit being inject to it:
Unable to deploy EJB: StocksBean from BLayer-1.0.0-SNAPSHOT.jar: No persistence unit named 'internalAppsPU' is available in scope BLayer-1.0.0-SNAPSHOT.jar. Available persistence units: []
Persistence module is basically a JAR file deployed as an Optional Package with following in its Manifest:
Extension-Name: PersistenceLayer
Implementation-Version: 1.0.0-SNAPSHOT
Specification-Version: 1.6
in EJB's code I have:
@Stateless(name="StocksBean", mappedName="StocksBean")
public class StocksBean implements Stocks {
     @PersistenceContext(unitName = "internalAppsPU")
     private EntityManager em;
and in EJB's JAR file I have:
pLayer-Extension-Name: PersistenceLayer
pLayer-Implementation-Version: 1.0.0-SNAPSHOT
pLayer-Specification-Version: 1.6
I'm deploying these one by one and not as an Application.

Answer 1

Hi Arun,
Thank you so much for taking time and responding. I'm still having the same issue.
You see, I had the exact same problem when my persistence Entities were in the same Jar file as EJBs and I found out the problem was the name of the persistence.xml file (which was "Persistence.xml") and also the version of the namespace used in the XML file which conflicted with version of JPA's spi (version of JPA's spi in JEE1.6 is 1.0 and I was using version 2.0 of the namespace).
However, I got that fixed and now I'm trying to separate the layers (just moved the files around and didn't change the content). Here is what I have so far:
Name of Persistence Layer's JAR file: PLayer.jar
Manifest of Persistence Layer's JAR file:
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: bm03043
Build-Jdk: 1.6.0_18
Extension-Name: PersistenceLayer
Implementation-Version: 1.0.0-SNAPSHOT
Specification-Version: 1.6
Name of EJB's JAR file: BLayer-1.0.0-SNAPSHOT.jar
Manifest of EJB's JAR file:
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: bm03043
Build-Jdk: 1.6.0_18
Extension-List: PLayer
PLayer-Extension-Name: PersistenceLayer
PLayer-Implementation-Version: 1.0.0-SNAPSHOT
PLayer-Specification-Version: 1.6
I didn't know that Extension-List entry in EJB's jar file should match with the name of Persistence layer's jar file.
As for deployment, I deploy the Player and then EJB.
Appreciate any input.
Edited by: Keibi on Apr 26, 2012 11:30 AM