[jboss-user] [EJB 3.0] - Re: Client access to Entity beans

[fguerzoni]

It's not MVC pattern, but FACADE pattern.

You don't need an EM on client, because EM can't do anything for you on client for client-server applications.
EM performs transactionally CRUD operations on server.
You have two options:
1) passing detached object to client, let client work on them, and eventually reattach them to EM on server -> less code
2) converting entities (model) to dto object and viceversa -> more flexibility

At the moment I've chosed the second option because I can't download to client all the Hibernate classes required to manage detached entity.
In the second case try out Dozer, it's a mapping library that does all the bidirectional mapping between model and dto quite automagically.


If your application is a standalone application, without server connection, so you have the database directly on client, you must bootstrap an embedded container and follow the general ejb3 tutorial. There's a lot of sample that explain how to do that.


ciao
F

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