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GGZ-Java  May. 12, 2006

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Dao-zero: implement your DAO intefaces  Apr. 28, 2006

DualRpc easy bidirectional RPC for GUI client to server  Apr. 25, 2006

ColoradoFTP - The Open Source FTP Server  Apr. 19, 2006

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Enterprise JavaBeans

Enterprise JavaBeans (EJB) is the primary server-side enterprise Java component architecture that allows developers to design and develop customizable, reusable business logic. Specific EJB topics of interest, include clustering, security, interoperability, design patterns, Message Beans, EJBQL, and Enterprise Media Beans (EMB).

Subtopics:
   • CMP
   • Entity Beans
   • Session Beans


Standardizing Java Persistence with the EJB3 Java Persistence API
By Debu Panda
Dissatisfaction with entity beans as an "official" means of persisting Java objects to databases has prompted a number of "unofficial" approaches, such as the very popular Hibernate. Now EJB3 seems to have learned its lesson: its new Java Persistence API allows you to persist plain old Java objects (POJOs) with a minimum of fuss and just a few annotations. Debu Panda looks at how to put this new standard to work. May. 17, 2006

JBoss Seam
By Thomas Heute
Many frameworks are perfectly sensible and well-designed on their own, but don't work particularly well when you try to combine them. Combining, for example, JSF and EJB 3.0 requires a lot of glue code, and adding another framework like JBoss BPM confuses things further. JBoss Seam is designed to provide common context for frameworks to share objects. Project leader Thomas Heute introduces Seam and what you can do with it. Mar. 15, 2006

Using Dependency Injection in Java EE 5.0
By Debu Panda
Dependency injection, also known as inversion of control, is a programming technique being adopted by many programmers and frameworks, including the popular Spring framework. But using it in J2EE 1.4 requires a burdensome deployment-descriptor-based approach. Debu Panda shows how Java EE 5.0 provides relief in the form of annotations-based dependency injection. Jan. 4, 2006

Bean-Managed Transaction Suspension in J2EE
By Dmitri Maximovich
Container-managed transactions seem more capable than bean-managed transactions in the EJB spec, with the latter unable to, for example, suspend and resume transactions. But what looks like a limitation isn't necessarily so, according to Dmitry Maximovich, who shows you how to get to the underlying TransactionManager, making BMT as powerful as CMT. Jul. 20, 2005

Constructing Services with J2EE
By Debu Panda
Web services are a popular means of deploying service-oriented applications, and the standards in J2EE 1.4 make it easier to develop services that are portable and interoperable. Debu Panda shows you how, and takes a look at how things will get easier in J2EE 5.0. May. 25, 2005

On-Demand Stateful EJBs
By Swaminathan Radhakrishnan
EJB session beans can be stateful or stateless, but they can't easily change from one to the other. That can be a problem in certain business situations. Swaminathan Radhakrishnan has a pattern that he says can address this problem. Feb. 23, 2005

Local and Remote EJB Interfaces
By Olexiy Prokhorenko
EJB 2.0's local interfaces can make your enterprise applications much faster, as they share data in memory instead of via an RMI link. But when can you use local interfaces, and when are you forced to go remote? Olexiy Prohorenko introduces the strategies for making the local/remote decision. Nov. 3, 2004

Using Timers in J2EE Applications
By Debu Panda
J2SE gained support for scheduled tasks in 1.3, and J2EE 1.4 provides an enterprise equivalent, with transactional, scheduled callbacks provided by application containers. Debu Panda introduces J2EE timers by way of an EJB that gets scheduled services. Oct. 13, 2004

"Head First EJB" Author Interview
By Daniel H. Steinberg
Kathy Sierra and Bert Bates have just completed the second title in O'Reilly's Head First series, the recently released Head First EJB, a certification book as unique as the series itself. In this interview, the authors discuss why the Head First series now includes a certification book, why the book is essential even if you're not planning to take the exam, how they've used their unique teaching style to help Java candidates pass the EJB exam, and much more. Nov. 5, 2003

Understanding Classloaders: log4j in a J2EE Environment
By Vikram Goyal
EJBs are a little different from the normal J2EE world. Part of that difference lies in the app server's classloaders. While demonstrating how to use log4j with EJB applications, Vikram Goyal explains how classloaders work and how to use them. Apr. 2, 2003

EJB Free and Open Source Tools Summary
By Emmanuel Proulx
What's the best platform for J2EE development? Emmanuel Proulx finds himself answering that question time after time. In this article, he explores several free-as-in-speech and free-as-in-beer EJB 2.0 tools and gives his suggestions for choosing an application server. Feb. 26, 2003

OpenEJB: EJB for Tomcat
By Jacek Laskowski
If you've ever added EJBs to an existing application, you know they can be complicated. Adding Tomcat makes it trickier. Fortunately, OpenEJB makes the process almost painless, as Jacek Laskowski explains. Feb. 12, 2003

Automating EJB Unit Testing
By JiRong Hu
Adopting Extreme Programming (XP) requires programmers to have automated unit tests for most of their code. Achieving that with Enterprise Java Beans presents some difficulties. One reason is that EJBs must be deployed before testing; another reason is their intrinsic relationship to the database. Using JUnit and Apache Ant, JiRong Hu shows a simple solution to automating EJB unit testing -- moving one step closer to true XP. Feb. 5, 2003

EJB Inheritance, Part 4
By Emmanuel Proulx
This series has demonstrated all sorts of ways to handle inheritance in beans. With web and message services, though, how do you handle inheritance with remotely-invoked beans? The EJB 2.0 specification allows it; Emmanuel Proulx demonstrates how. Jan. 29, 2003

EJB Inheritance, Part 3
By Emmanuel Proulx
Session beans can take advantage of inheritance, just like entity beans. Indeed, implementing session bean inheritance is nowhere near as hard as it is with entity beans. Part 3 of this series shows the proper technique for implementing inheritance in session beans and addresses the use of factories. Nov. 13, 2002

EJB Inheritance, Part 2
By Emmanuel Proulx
Part two of this series on inheritance with Entity Java Beans focuses on the various options for table mapping. Sep. 25, 2002

EJB Inheritance, Part 1
By Emmanuel Proulx
The principles of object-oriented programming are encapsulation and inheritance. Enterprise JavaBeans handle encapsulation just fine, but what about inheritance? In this article, the author attempts to apply inheritance to EJBs. Sep. 4, 2002

What's New in EJB 2.1?
By Emmanuel Proulx
The draft spec for EJB 2.1 is out, and it includes enhancements to message-driven beans, the query language, and support for Web services.  Aug. 14, 2002

Business Logic, Part 3
By Brett McLaughlin
In Part 3 of our excerpt from Building Java Enterprise Applications (Vol. 1, Architecture), Brett McLaughlin addresses issues of statelessness and statefulness. Mar. 13, 2002

Business Logic, Part 2
By Brett McLaughlin
In Part 2 of our excerpt from Chapter 8 of Building Java Enterprise Applications, Vol I: Architecture, Brett McLaughlin builds a UserManager component, and illustrates why managers are a good thing.  Mar. 6, 2002

JDO vs. Entity Beans: A Modest Proposal
By Marek Mosiewicz
The Java Data Objects (JDO) approach can replace performance-poor Entity Beans in many cases. But JDO is not enough; here's a proposal for improving Entity Beans without sacrificing their server-side power. Feb. 27, 2002

Business Logic, Part 1
By Brett McLaughlin
In this excerpt from Chapter 8 of Building Java Enterprise Applications, Vol I: Architecture, Brett McLaughlin discusses the façade pattern, in which you use session beans to access entity beans. This access method is used instead of allowing direct access to entity beans, and is key to a sound strategy in building enterprise applications.  Feb. 20, 2002

Using XDoclet: Developing EJBs with Just the Bean Class
By Dion Almaer
XDoclet creates and manipulates XML descriptors and interfaces for EJBs. This article shows you how to take advantage of this open source tool. Jan. 30, 2002

The Debate Over Java Data Objects
By Dion Almaer
The Java Data Objects spec is intended to free developers from worrying about mapping objects to databases. But not everyone thinks it's a great idea. Vendors like Thought Inc. take issue with JDO and think they have better solutions. Dion Almaer weighs in on the issues. Jan. 23, 2002

Unlocking the True Power of Entity EJBs
By Tyler Jewell
Tyler Jewell explains the real power of entity EJBs: developers can write once and deploy many times, with each deployment customized for unique data scenarios. Dec. 19, 2001

Stateful Session EJBs: Beasts of Burden
By Tyler Jewell
Tyler Jewell, BEA Systems Java Trainer, discusses the true purpose of Stateful session EJBs (SFSBs), where they belong in a J2EE design, and where they should not be used. Learn how to harness these beasts to create more robust architectures--not more burdens. Oct. 2, 2001

EJB Message-Driven Beans
By Richard Monson-Haefel
In this excerpt from Chapter 13 of Enterprise JavaBeans, Richard Monson-Haefel explains EJB 2.0 Message-Driven Beans, and shows you how to use these in your enterprise Java and Web services development efforts.  Sep. 27, 2001

Learning EJB QL
By Jeelani B. Shaik
Learn how the addition of EJB QL to EJB 2 justifies the distributed component architecture as the standard way of defining queries, which allows database applications to be more portable.  Sep. 19, 2001

EJB 2 and J2EE Packaging, Part II
By Tyler Jewell
Tyler Jewell continues his coverage of J2EE packaging issues by focusing on the approaches that vendors can use for implementing EAR classloaders and their ambiguities. Jul. 25, 2001

EJB 2 and J2EE Packaging
By Tyler Jewell
Tyler Jewell is back to discuss some of the nuances associated with J2EE packaging and provides some hints to make you more productive. Jun. 26, 2001

Using Ant and WebLogic EJBs
By Jesse E. Tilly
EJBs are complex. The steps required just to deploy them for Web application servers are difficult. But for developers using BEA WebLogic, life is much easier, thanks to Ant.  Jun. 25, 2001

EJB 2 Message-Driven Beans
By Dion Almaer
This article will talk about the new EJB 2.0 Message Driven Beans. I will walk through an example of using this new bean, along with the corresponding JMS infrastructure that surrounds it. May. 22, 2001

EJB 2.0 Specification Release Review
By Tyler Jewell
The latest revision of EJB 2.0 removes dependent objects and introduces local interfaces. Here's how to deal with them.  May. 10, 2001

Sorting Out the EJB 2.0 Rumors
By Tyler Jewell
Tyler Jewell examines the latest rumors about the changing EJB 2.0 specification. Mar. 29, 2001

What's Wrong with the EJB 2 Specification?
By Tyler Jewell
Tyler Jewell points out errors in the latest EJB 2.0 API specification.  Feb. 28, 2001

Clustering Stateless Session Beans
By Tyler Jewell
Adding to last month's article, Jewell demonstrates other techniques for load balanced and fault tolerant EJBs. Jan. 18, 2001

EJB 2 Clustering with Application Servers
By Tyler Jewell
Tyler Jewell, BEA Systems Java Trainer, teaches clustering with EJB 2, including a systematic breakdown of the different possibilities that application server vendors may incorporate. Dec. 15, 2000

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  Resources
EJB-QL  Jan. 2, 2002

When to Use EJB  Oct. 9, 2001

EJB QL  Sep. 27, 2001

Message-Driven Bean Example  Sep. 27, 2001

Bean-Managed Persistence Examples  Sep. 27, 2001


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  Events
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