Java EE 8 Design Patterns and Best Practices

Business Delegate – obsolete or not

In the old J2EE architecture, both remote and local business services, such as EJB, use a service locator mechanism. However, dependency injection is now used to access local EJBs (and the option for local services is increasingly being used). In many cases, using a Business Delegate to look for local services has become somewhat obsolete for this reason. Consequently, someone could question the use of a pattern, such as Business Delegate, only to handle remote communications. This is because, since JEE5, we have begun to use DI annotations to reference local EJB with ease. However, if we think of a Business Delegate as a bridge for Session Bean EJBs, for example, then we can change these EJBs (when necessary) ...