Developing federated application with Java technology

Web-enabled applications that are developed in a database environment can use several components of the Java™ 2 Enterprise Edition (J2EE) server environment. Some of the J2EE components include support for enterprise beans, connections to the database manager, and access to the database manager, which includes support for Java Database Connectivity code and Java transaction application programming interfaces.

• Advantages of enterprise beans in a federated system
  By using enterprise beans and federated system objects, programmers can perform database operations and access multiple data sources. Programmers can create applications that integrate disparate data through Enterprise JavaBeans™ technology.
• Enterprise beans in a federated system
  Programmers can use enterprise beans and federated system objects to perform database operations or transactional work and access data that spans multiple heterogeneous sources. Federated systems support automated development and deployment of a single container-managed persistence entity bean whose attributes map to data from multiple resources.
• Creating and deploying a container-managed persistence bean
  You can create container-managed persistence entity beans that map to federated systems nicknames.