Summary

This chapter described the implementation and deployment of entity EJBs in WebLogic Server. The entity bean provider must be aware of the many services provided by the EJB container. The services include persistence management, transaction management, and life cycle management. Using these services effectively will result in less development time for the bean provider and produce a more reliable, durable, portable, and higher performance in the implementation. There are application-specific issues that require a decision to use bean-managed persistence or container-managed-persistence. With the components of the entity bean are the ejb-jar.xml and weblogic-ejb-jar.xml deployment descriptors. If the entity bean is implemented using CMP, a weblogic-cmp-rdbms.jar.xml persistence descriptor must also be written. The components of the entity EJB are compiled and stored in a jar file along with the deployment descriptors. The entity EJB jar file may be stored in an Entity Application Archive (EAR) file. The JAR or EAR file is then deployed on WebLogic Server to be the persistent storage for an enterprise application.