By Norman Richards

JBoss is an open resource J2EE software server that has completed a certain quantity of industrial luck. during this quantity Richards (a JBoss developer at JBoss Inc.) and Griffith (a software program improvement advisor) current an example-driven consultant that demonstrates the code used for fitting and operating JBoss, deploying an software, making a whole program, connecting to a true database, using safeguard, logging, configuring endurance, coping with and tracking JBoss.

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Example text

However, it's generally accepted that it's better to put fundamental service code in the lib directory. JAR files in the deploy directory will be redeployed if you accidentally touch them, through an automated build script, for example. That can create havoc if several applications share the JDBC driver. Note: Wouldn't it be nice if relational databases had a standard network protocol so that we didn't have to mess with drivers? We really just don't think of a JDBC driver as being an application component.

The CMP fields of the bean map to columns of the same name. The task-to-comment relationship is a simple, one-to-many relationship that can be mapped using a foreign key. The TASK column on the COMMENT table provides this. If you examine the constraints under the Indices item, you'll see a primary key constraint on the ID field but no foreign key constraint on the TASK column. This is due to a shortcoming of CMP entity beans. JBoss does give you the ability to work around this limitation, but most J2EE developers have learned to simply work without foreign keys.

The CMP subclass helper gets very little attention, but it is one of the more valuable XDoclet tasks. Managing value objects is hard work. Example 3-5 shows the generated CMP subclass. Example 3-5. ejb; /** * CMP layer for Task. EntityBean { public void ejbLoad( ) { } public void ejbStore( ) { } public void ejbActivate( ) { } public void ejbPassivate( ) {... FinderException {... RemoveException {... Task getTask( ) {... Task valueHolder) {... getTask() and setTask() perform the actual work of creating and consuming the value objects.

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