Enterprise JavaBeans 3.0, 5th Edition

Chapter WORKBOOK 13. Exercises for Chapter 16

This chapter’s exercises illustrate the conversational persistence context behavior discussed in Chapter 16.

Exercise 16.1: Conversational Persistence Contexts

This exercise implements the modifications we made to the TravelAgent and ProcessPayment EJBs to illustrate queuing behavior when extended persistence contexts are invoked upon outside of a transaction. The Titan Cruises reservation system from Exercise 11.4 in Workbook 9 has been modified so that you can book multiple reservations with the same TravelAgent EJB in one large, distributed conversation.

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 16.1 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 ex16_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\ex16_1> set JAVA_HOME=C:\jdk1.5.0 C:\workbook\ex16_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\ex16_1> set PATH=..\ant\bin;%PATH% ...