The EJB
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• The EJB specification intends to provide a standard way to implement the back-end 'business' code typically found in enterprise applications . EJB code was frequently found to address the same types of problems, and it was found that solutions to these problems are often re peatedly re-implemented by programmers. • EJB APPLICATION SERVER PROVIDE • Transaction processing • Integration with the Persistence services offered by the Java Persistence API (JPA) • Concurrency control • Events using Java Message Service • Naming and directory services (JNDI) • Security (Java Cryptography Extension (JCE) and JAAS) • Deployment of software components in an application server • Remote procedure calls using RMI-IIOP. • Exposing business methods as Web Services Enterprise beans Enterprise beans are typically deployed in EJB containers and run on EJB servers. • You can customize them by changing their deployment descriptors and you can assemble them with other beans to create new applications.
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