Used to mark a session bean method as an asynchronous method or to designate all business methods of a session bean class as asynchronous.

An asychronous method must have return type void or Future<V>, where V is the result value type.

Asynchronous method invocation semantics only apply to the no-interface, local business, and remote business client views. Methods exposed through the EJB 2.x local, EJB 2.x remote, and web service client views must not be designated as asynchronous.