Annotating a Session Bean

[Joe Harry]

Hi Guys,

I have a small question on annotating a session bean class. Imagine I have a session bean and I want to provide both the Local and Remote interfaces for it. Can I just annotate at the class level

@Local(LocalInterface.class)
@Remote(RemoteInterface.class)
public class SessionBeanClass {
.......
.......
.......
}

please advise!

[Jaikiran Pai]

Yes you can. But also remember to "implement" both these interfaces on the session bean:

@Stateless
@Local(LocalInterface.class)
@Remote(RemoteInterface.class)
public class SessionBeanClass [B]implements LocalInterface, RemoteInterface[/B] {
.......
.......
.......
}

[Joe Harry]

Another way of implementing it would be like,

 
@Local
public interface LocalInterface {}
 
@Remote
public interface RemoteInterface extends LocalInterface {}
 
@Stateless
public class SessionBeanClass implements RemoteInterface {
......
......
 
}

Any coments on this?
[ August 12, 2008: Message edited by: Jothi Shankar Kumar Sankararaj ]

[Jaikiran Pai]

Even this is possible. I have even seen examples where the local and remote interfaces extend from a common interface. It's all upto the bean developer and also on what APIs you want to expose in a local interface and a remote interface.

[Joe Harry]

Thanks for your comments!

[Michael Wiezik]

Originally posted by Jaikiran Pai:
Yes you can. But also remember to "implement" both these interfaces on the session bean:

@Stateless
@Local(LocalInterface.class)
@Remote(RemoteInterface.class)
public class SessionBeanClass [B]implements LocalInterface, RemoteInterface[/B] {
.......
.......
.......
}

As far as I can remember, session bean class does not have to explicitely implement its local/remote interfaces, in terms you don't have to put 'implements LocalInterface, RemoteInterface' clause at all, as long as bean implementation defines all methods declared in local/remote interfaces. Please correct me if I'm wrong.

[Jimmy Clark]

The annotations are sufficient.

[Jaikiran Pai]

Just went through the spec. You guys are right. Implementing the interfaces is optional:

The bean class may implement its business interface(s).

While it is expected that the bean class will typically implement its business interface(s), if the bean class uses annotations on the
bean class or the deployment descriptor to designate its business interface(s), it is not required that the bean class also be specified
as implementing the interface(s).