The Delegation-Managed Persistence Entity Bean: A composite entity bean for a new generation

With the introduction of the EJB 2.0 specification, the classic composite entity bean design pattern became outdated overnight. In this article, I present a new pattern that can serve as a proper replacement. This pattern, called Delegation-Managed Persistence bean (DMP bean), allows developers to represent objects that span multiple database tables. DMP beans provide a better solution than the original Composite EJB pattern without making you roll your own persistence mechanism.