Enterprise JavaBeans 3.0, 5th Edition

Chapter WORKBOOK 6. Exercises for Chapter 8

Chapter 8 of the EJB book walked you through some basic examples of mapping inheritance hierarchies. The exercises in this chapter use the code from Chapter 8 to show you each inheritance mapping strategy in action.

Exercise 8.1: Single Table per Hierarchy

This exercise maps the Person-Customer-Employee hierarchy shown in Chapter 8 using the SINGLE_TABLE inheritance mapping strategy.

Start Up JBoss

If you already have JBoss running, there is no reason to restart it. Otherwise, start it up as instructed in Workbook 1.

Initialize the Database

The database tables will be created when Exercise 8.1 is deployed to JBoss. If you have problems running this example, shut down JBoss and run the clean.db Ant task.

Build and Deploy the Example Programs

Perform the following steps:

1. Open a command prompt or shell terminal and change to the ex08_1 directory created by the extraction process.

2. Set the JAVA_HOME and JBOSS_HOME environment variables to point to where your JDK and JBoss 4.0 are installed. Examples:

   Windows:

   C:\workbook\ex08_1> set JAVA_HOME=C:\jdk1.5.0
   C:\workbook\ex08_1> set JBOSS_HOME=C:\jboss-4.0.x

   Unix:

   $ export JAVA_HOME=/usr/local/jdk1.5.0
   $ export JBOSS_HOME=/usr/local/jboss-4.0

3. Add ant to your execution path. Ant is the build utility.

   Windows:

   C:\workbook\ex08_1> set PATH=..\ant\bin;%PATH%

   Unix:

   $ export PATH=../ant/bin:$PATH

4. Perform the build by typing ant.

titan.jar is rebuilt, copied to the JBoss deploy directory, and redeployed by the application ...