[jboss-dev-forums] [JBoss AS7 Development] - EJB3 support in JBoss AS 7.0.0.Beta2

[Carlo de Wolf]

Carlo de Wolf [http://community.jboss.org/people/wolfc] modified the document:

"EJB3 support in JBoss AS 7.0.0.Beta2"

To view the document, visit: http://community.jboss.org/docs/DOC-16682

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This document outlines the EJB 3.x support that's currently available in JBoss AS 7.0.0.Beta2

h3. Support for EJB 3.x session beans

h4. Annotation based support

h5. @Stateless, @Stateful, @Singleton : 

JBoss AS 7.0.0.Beta2 has support for annotation based session beans (i.e. @Stateless, @Stateful and @Singleton). A bean annotated with any of these session bean annotation will be picked up and processed appropriately.

h5. Local annotated views:

* @Local and @LocalBean : JBoss AS 7.0.0.Beta2 supports local business interface view and the no-interface view of session beans. 

* @Remote view: Currently, the @Remote annotation is processed and a view is created out of it. However, remote view semantics don't apply and it works the same as a @Local.

* @RemoteHome and @LocalHome view: Furthermore, there is *no* support yet for EJB2.x views (via @LocalHome and @RemoteHome)

h5. Tansaction management annotations:

* @TransactionManagement : JBoss AS 7.0.0.Beta2 supports both container managed transactions and bean managed transactions, configured through annotations. 

* @TransactionAttribute : Various different transaction attributes (configured via @TransactionAttribute annotation) are also supported. Note that JBoss specific way of setting a transaction timeout through an annotation is *not* yet supported in this version.

h5. Concurrency management annotations:

* @ConcurrencnyManagement : Both bean and container managed concurrency support for @Singleton beans is available in JBoss AS 7.0.0.Beta2.

* @Lock : Both READ and WRITE lock support is also available in JBoss AS 7.0.0.Beta2 

* @AccessTimeout : Support for configuring an access timeout through the @AccessTimeout annotation is also available in JBoss AS 7.0.0.Beta2.

h5. Init on Startup for singleton beans:

* @Startup : Init-on-startup support for singleton beans, through the use of @Startup is available in JBoss AS 7.0.0.Beta2

h5. Dependencies configuration for singleton beans:

* @DependsOn : Only a partial support is available for this annotation in JBoss AS 7.0.0.Beta2. The annotation is processed and appropriate dependencies are added between the singleton beans. This works fine against @Startup @Singleton beans. But for normal (lazy) @Singleton beans, the @DependsOn may not work as mandated by the spec. This will be fixed in later versions of JBoss AS 7.0.0.Beta2

h5. Resource injection and EJB injection:

* @Resource and @EJB : These annotations are supported in JBoss AS 7.0.0.Beta2. These can be used in container managed components to inject the resources and EJBs respectively.

h4. ejb-jar.xml deployment descriptor based support

* Support for session beans: JBoss AS 7.0.0.Beta2 allows you to configure your session beans through the use of ejb-jar.xml. All types of session beans (Stateless, Stateful and Singleton) are supported.

* Transaction Management support: You can configure transaction management semantic through the use of ejb-jar.xml for your session beans. Both bean managed transactions and container managed transactions are supported.

* Support for business views: Currently only business-local and local-bean views are supported through ejb-jar.xml for session beans. business-remote element is processed and a view is created out of it, but remote semantics haven't been implemented and it works like a business-local for now.

* Support for interceptors: JBoss AS 7.0.0.Beta2 has support for interceptors of EJBs configured via ejb-jar.xml. However, explicit interceptor-ordering isn't yet supported.

h4. Merged view of annotations and ejb-jar.xml for EJBs

Although there is an initial implementation available in JBoss AS 7.0.0.Beta2 for supporting partial deployment descriptor + partial annotation based EJBs, it's still in its early stages and isn't stable. Upcoming releases will have better support for a merged view of EJBs.


h3. Where to ask questions or report issues:

If you run into any issue while trying out any EJB3 application against JBoss AS 7, then please either report it in the user forums  http://community.jboss.org/en/jbossas?view=discussions http://community.jboss.org/en/jbossas?view=discussions or subscribe to the AS7 mailing list  https://lists.jboss.org/mailman/listinfo/jboss-as7-dev https://lists.jboss.org/mailman/listinfo/jboss-as7-dev and mail your question there. 
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