As mentioned in Chapter 4, Understanding Migration, while Application Server 6.x supports the EJB 1.1 specification, Application Server also supports the EJB 2.0 specification. The EJB 2.0 specification introduces the following new features and functions to the architecture:
Message Driven Beans (MDBs)
Improvements in Container-Managed Persistence (CMP)
Container-managed relationships for entity beans with CMP
EJB Query Language (EJB QL)
Although the EJB 1.1 specification continues to be supported in the Application Server, the use of the EJB 2.0 architecture is recommended to leverage its enhanced capabilities.
For detailed information on migrating from EJB 1.1 to EJB 2.0, please refer to Chapter 5, Migrating from EJB 1.1 to EJB 2.0