Annotation support in Hibernate3.0a

emmanuel · **Posted:** Mon Dec 27, 2004 5:48 am

graysonpierce wrote:

I want to make sure I understand this. EJB 3.0 support has been added to Hibernate (IE the JBoss implemention and standalone) but not to the Extension correct? In other words is it possible to automatically generate EJB 3.0 code with hbm2java ?

Happy you asked, you did not understand ;-)
I don't know what you mean by Extension. What I mean, is that there is not yet specific annotations for Hibernate to enhance the EJB3 subset.
No it is not possible to geenrate EJB3 code with hbm2java, I don't think this is a good idea actually.
The typical use case is:
- you create your annotated java classes
- you use hibernate (there is no hbm involved at all here)

max · **Posted:** Mon Dec 27, 2004 7:15 am

we will have a hbm2java for H3 that does this

max · **Posted:** Mon Dec 27, 2004 7:17 am

....and it is a very good idea (very easy for people to migrate back and forth then ,)

jemiller · **Posted:** Sun Jan 02, 2005 11:32 pm

Can someone tell me if the schemaexport Ant task will be updated to work with annotations?

The other thing that I'm wondering is if there will be EJB interfaces which are equivalent to org.hibernate.SessionFactory, org.hibernate.Session , etc., but, implementation independent that will work in stand-alone mode? The tutorial shows it just using the Hibernate interfaces.

jemiller · **Posted:** Sun Jan 02, 2005 11:37 pm

I think what I'm wondering is where the EntityManager interface is that is mentioned in the EJB spec... (still need to finish reading about it)

christian · **Posted:** Mon Jan 03, 2005 5:00 am

In ejb-api.jar.

max · **Posted:** Mon Jan 03, 2005 5:38 am

schemaexport should be trivial to upgrade to run with annotations (as soon as "someone" defines how to look up the classes - e.g. by mentioning the classes in some file.)

jemiller · **Posted:** Mon Jan 03, 2005 9:14 am

I don't seeem to have an ejb-api.jar. Can you tell me where I would find it?

I do have the following file which has the annotations in it, but, there isn't an EntityManager.

C:\HibernateExt\ejb-api\build\jar tf ejb-3.0-edr1.jar
META-INF/
META-INF/MANIFEST.MF
javax/
javax/ejb/
javax/ejb/AccessType.class
javax/ejb/AssociationTable.class
javax/ejb/Basic.class
javax/ejb/CascadeType.class
javax/ejb/Column.class
javax/ejb/Dependent.class
javax/ejb/DependentAttribute.class
javax/ejb/DependentObject.class
javax/ejb/DiscriminatorColumn.class
javax/ejb/DiscriminatorType.class
javax/ejb/Entity.class
javax/ejb/EntityType.class
javax/ejb/FetchType.class
javax/ejb/GeneratorTable.class
javax/ejb/GeneratorType.class
javax/ejb/Id.class
javax/ejb/Inheritance.class
javax/ejb/InheritanceJoinColumn.class
javax/ejb/InheritanceJoinColumns.class
javax/ejb/InheritanceType.class
javax/ejb/JoinColumn.class
javax/ejb/JoinColumns.class
javax/ejb/ManyToMany.class
javax/ejb/ManyToOne.class
javax/ejb/OneToMany.class
javax/ejb/OneToOne.class
javax/ejb/SecondaryTable.class
javax/ejb/SecondaryTables.class
javax/ejb/SequenceGenerator.class
javax/ejb/Serialized.class
javax/ejb/Table.class
javax/ejb/TableGenerator.class
javax/ejb/Transient.class
javax/ejb/UniqueConstraint.class
javax/ejb/Version.class
META-INF/license.txt

christian · **Posted:** Mon Jan 03, 2005 9:27 am

http://jboss.org/products/ejb3 and follow JBoss' CVS.

emmanuel · **Posted:** Mon Jan 03, 2005 10:56 am

jemiller wrote:

I think what I'm wondering is where the EntityManager interface is that is mentioned in the EJB spec... (still need to finish reading about it)

We've not yet work on this thin wrapper. But check the APIs, they're quite the same.
We are focused on annotation support.

jemiller · **Posted:** Mon Jan 03, 2005 2:27 pm

Thanks for the info. Can you tell me if EntityManager will be included in the release version of Hibernate 3.0?

christian · **Posted:** Mon Jan 03, 2005 2:33 pm

EJB3 APIs will be implemented as part of the EJB3 products at JBoss. Hibernate3 will be part of this, but I don't think the Hibernate 3.0 distribution needs the ejb3-api.jar. The dependency is in the other direction.

jemiller · **Posted:** Mon Jan 03, 2005 2:41 pm

Is it possible to use the EntityManager without the application server? i.e. in a stand-alone application? I want to use it in a stand-alone application, but, I want to use the EJB defined APIs if I can manage it. This way I'm not tied to a particular implementation.

The other thing that I'm wondering is that I heard that EJB 3.0 entity beans will likely eventually be included in J2SE. If so, is it still going to be called EJB, or, are they going to rename it to something else? I know this isn't really a Hibernate question, but, I'm just curious if you might have some inside information...

gavin · **Posted:** Mon Jan 03, 2005 2:45 pm

Yes, the JSR-220 spec is being written in two parts. It will be permissable to implement just the EJB 3.0 Persistence part without the rest of the spec. We will deliver an EJB 3.0 Persistence implementation as a separate download (call it something like "JBoss EntityManager"), which will basically be a fairly minimal wrapper around hibernate3.jar and hibernate-annotations.jar.

There is no plan to include an EJB3 implementation in J2SE. However, it will of course be possible to use EJB 3.0 Persistence outside the context of J2EE (just like JMS today).

jemiller · **Posted:** Mon Jan 03, 2005 2:54 pm

Great! Thanks for the info.