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  1. What is a Session Bean?
  2. Enterprise Java bean projects (EJB to EJB )
  3. A brief review of the EJB 2.1 specification
  4. Bibliographic Information

The bean class using the timer service must implement the javax.

What is a Session Bean?

TimedObject interface. This interface has a single method, the timer callback method ejbTimeout.

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A bean may cancel a timer before it actually expires. If a timer is cancelled, the ejbTimeout method is not called. Support for Web services Stateless session beans may have Web service clients. The bean provider chooses a Web service endpoint interface for a stateless session bean when it wishes to expose the bean's functionality as a Web service endpoint.

Web service clients send or receive messages with SOAP. From the client perspective, the stateless session bean is completely hidden behind the Web service endpoint; the client accesses the Web service functionality through the endpoint. Stateless session beans deployed as Web services are accessed by various clients, independent of platform and language.

Enterprise Java bean projects (EJB to EJB )

In this case, a single line of business code is unnecessary inside the entity bean. Everything is written in the ejb-jar.

  1. EJB Programmer's Guide;
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  3. Migrating message-driven beans.

The container compiles the queries to a target language like SQL for the underlying database. Consequently, entity beans are optimizable and portable.

A brief review of the EJB 2.1 specification

An OrderBy clause, which allows objects or values returned by a query to be ordered in specific fashion. Message-driven beans for non-JMS message sources Message-driven beans are asynchronous message consumers. These beans are anonymous components that do not have client visibility; remote clients can't use them directly. EJB 2. A message-driven bean can receive messages from a single messaging type only, depending upon the messaging interface it extends. For example, a message-driven bean implementing javax.

MessageListener consumes JMS messages only. On the other hand, a message-driven bean implementing either one of interfaces javax.

OnewayListener or javax. Scratching the surface In this article, we've provided only a brief introduction to the cool new aspects of the EJB 2.

Bibliographic Information

Be sure to review the complete EJB 2. This invaluable resource also discusses topics beyond the specification: inheritance, coupling of EJB components, quality assurance, and more.

After reading this book, you'll understand the benefits and the limits of EJB and have the knowledge necessary to turn business requirements into EJB-based applications. Rob's multinational background, combined with his strong real-world business experience, enables him to see through the specifications to create realistic solutions to major business problems. JavaScript is currently disabled, this site works much better if you enable JavaScript in your browser. Free Preview. Buy eBook. Buy Softcover.

FAQ Policy. About this book Enterprise JavaBeans EJB is a server-side component model for transaction-aware distributed enterprise applications, written in the Java programming language.

What are EJBs Enterprise Java Beans?

Show all. Table of contents 10 chapters Table of contents 10 chapters Introduction Pages Denninger, Stefan et al. Fundamentals Pages Denninger, Stefan et al. Session Beans Pages Denninger, Stefan et al. Entity Beans Pages Denninger, Stefan et al.