I've been banging my head trying to get Glassfish to use Hibernate 3 as my JPA provider packaged within my EAR file instead of TopLink essentials. Finally got it to work, just a few tips for other people trying to do the same thing..
GlassFish Version = V2 UR1
Hibernate v3 Core Version = 3.2.6.ga
Hibernate EntityManager Version = 3.2.2.ga
My ear file is packaged as such
MyEAR.ear [
lib\
lib\hibernate3.jar
lib\hibernate-annotations.jar
lib\hibernate-commons-annotations.jar
lib\hibernate-entity-manager.jar
lib\antlr-2.7.6.jar
lib\asm.jar
lib\asm-attrs.jar
lib\commons-collections-2.1.1.jar
lib\commons-logging-1.0.4.jar
lib\concurrent-1.3.2.jar
lib\dom4j-1.6.1.jar
lib\ehcache-1.2.3.jar
lib\javassist.jar
lib\log4j-1.2.11.jar
MyModel.jar (Java Persistence Unit)
MyEJB.jar (EJB Session Beans)
MyWebApp.war (Web Application)
]
In regards to the MyModel.jar - it includes the POJO classes, along with the META-INF/orm.xml, and the META-INF/persistence.xml.
The persistence.xml will require that the JPA provider be set as such
<provider>org.hibernate.ejb.HibernatePersistence</provider>
Moreover, the following hibernate properties will also need to be set (in the persistence.xml)
<property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect" />
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider" />
<property name="hibernate.cache.use_query_cache" value="true" />
<property name="hibernate.max_fetch_depth " value="3" />
<property name="hibernate.default_batch_fetch_size" value="16" />
<property name="hibernate.order_updates" value="true" />
<property name="hibernate.order_inserts" value="true" />
[b]
It is also very important to create a "hibernate.properties" file inside the MyModel.jar[/b]. If you try setting this in your persistence.xml - your PU will just fail to deploy as it will still default to CGLIB (using cglib will just give you class loading errors even if you have the cglib-2.1.3 in your EAR's lib folder - the exceptions throw will be some ClassNotFoundException). So basically, make sure you create a hibernate.properties file with the following content
hibernate.bytecode.provider=javassist
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