Enterprise JavaBeans, Second Edition

Describing Beans

The beans contained in a JAR file are described within the deployment descriptor’s enterprise-beans element. So far, we’ve only talked about deployment descriptors for a single bean, but there’s no reason that you can’t package several beans in a JAR file and describe them all within a single deployment descriptor. We could, for example, have deployed the TravelAgent, ProcessPayment, Cruise, Customer, and Reservation beans in the same JAR file. The deployment descriptor would look something like this:

<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise
JavaBeans 1.1//EN" "http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd">

<ejb-jar>
 <description>
    This Deployment includes all the beans needed to make a reservation:
    TravelAgent, ProcessPayment, Reservation, Customer, Cruise, and Cabin.
 </description>
 <enterprise-beans>
   <session>
      <ejb-name>TravelAgentBean</ejb-name>
      <remote>com.titan.travelagent.TravelAgent</remote>
      ...
   </session>
   <entity>
      <ejb-name>CustomerBean</ejb-name>
      <remote>com.titan.customer.Customer</remote>      
      ...
   </entity>
   <session>
      <ejb-name>ProcessPaymentBean</ejb-name>
      <remote>com.titan.processpayment.ProcessPayment</remote>
      ...
   </session>
   ...
 </enterprise-beans>
 <assembly-descriptor>
 ...
 </assembly-descriptor>
 ...
</ejb-jar>

In this descriptor, the enterprise-beans element contains two session elements and one entity element describing the three beans. Other elements within the entity and session elements provide detailed ...