June 2004
Intermediate to advanced
792 pages
23h 17m
English
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Exercise 5.2: The EJBObject, Handle, and Primary Key
The example programs in Exercise 5.2 explore the APIs available
through the
EJBObject
and
EJBMetaData
interfaces. They also reveal how to use
Handle
and
HomeHandle
as
persistent references to EJB objects and homes.
Start Up JBoss
If you already have JBoss running, there is no reason to restart it. Otherwise, start it up as instructed in the JBoss Installation and Configuration chapter at the beginning of this workbook.
Initialize the Database
The database should contain the 100 rows created by a successful
execution of the test programs from Exercise 4.1; otherwise, this
example will not work properly.
Build and Deploy the Example Programs
In the ex05_2 directory, build and deploy the
examples as you did for Exercise 5.1.
Examine the JBoss-Specific Files
There are no new JBoss configuration files or components in this exercise.
Examine and Run the Client Applications
Three example programs illustrate the concepts explained in the EJB book:
-
Client_52a.java Shows the use of
EJBObjectto retrieve an EJB’s home interface.-
Client _52b.java Shows how to use
isIdentical( )to determine whether two EJB references are to the same object.-
Client _52c.java Shows how to use EJB handles as persistent bean references.
The example code is pulled directly from the EJB book and embellished somewhat to expand on introduced concepts. The EJB book does a pretty good job of explaining the concepts illustrated in the example programs, so further ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.