May 2004
Beginner to intermediate
1032 pages
23h 48m
English
book
Sams Teach Yourself J2EE™ in 21 Days, Second Edition
by Martin Bond, Dan Haywood, Debbie Law, Andy Longshaw, Peter Roxburgh
Content preview from Sams Teach Yourself J2EE™ in 21 Days, Second Edition
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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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.