EJB 3.1 Singleton bean across EARs

[mkind]

Hello!

As I know, @Singleton has only one instance per JVM.

I have commons.jar with com.example.MyBean (singleton) and commons.jar deploys to several EARs (inside lib folder). Will I have an access to only one instance from any EARs or each EAR will have own instance of the MyBean?

Thanks,

Vladimir

[wdfink]

I suppose it will be deployed as a different applcation, but I'm not 100% sure ATM

[mkind]

"as a different applcation" = "many instances of singleton"?

[wdfink]

yes

[jason.greene]

Wolf-Dieter Fink wrote:

I suppose it will be deployed as a different applcation, but I'm not 100% sure ATM

Yes that is correct. A singleton's uniquness incorporates the deployment which contains it. So if you have another deployment wiht the same class it's a different singleton. If you want to share a singleton across deployments, then you have to deploy it separately and ensure that communication is over a shared class (e.g. a module import or class-path reference to a common interface)