stateless singleton in Java EE

Question

I want to define a "stateless singleton" in JAVA-EE which can be accessed by multiple threads simultanously.

By stateless I mean: the Bean-Instance has no fields.

Which one should I use:

version 1:

@javax.ejb.Singleton
@ConcurrencyManagement(ConcurrencyManagementType.BEAN)
public class MyStatelessSingleton {
..
}

version 2:

@ApplicationScoped
public class MyStatelessSingleton {
..
}

version 3:

@javax.inject.Singleton
public class MyStatelessSingleton {
..
}

By the way, I cannot see the benefit in having pooled "stateless instances" instead of one "stateless singleton bean".

Answer 1

I dont think that matters. Its a singleton. It stateless/statefull nature will be only dictated by how you implement it. ApplicationScoped is my favorite here.