How Do I Use an EJB?

Given that EJBs are middle-tier business components, they are of little use without a client to drive them. As mentioned earlier, those clients can be Web components, standalone Java clients, or other EJBs.

Regardless of the type of client, using an EJB requires the same set of steps—namely, discovery, retrieval, use, and disposal. Listing 4.7 shows a simple client for use with the Agency EJB illustrating these steps. The following three sections cover these steps in more detail.

Listing 4.7. Simple Agency Client SimpleClient.java
 package client; import agency.*; import javax.ejb.*; import javax.naming.*; import java.rmi.*; import javax.rmi.*; import java.util.*; public class SimpleClient { private static String agencyJNDI ...

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