11.3. Associations between entities
Although it is quite clear than entity EJBs will have persistent data elements—the Customer EJB has persistent name, address, and credit card details, for example— closer inspection reveals that it is not only the data that is persistent. The problem is that entity EJBs have associations with other entity EJBs, and these associations will themselves be persistent.
In this section, we discuss associations in general, followed by typical schemes for implementing them.
11.3.1. What are associations?
The real power of object-oriented development comes from the expressiveness of object interactions. Objects can be associated [5] (related) in a number of ways and interact along those associations. Of course, a ...
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