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Java Persistence: JBoss EJB 3.0 Preview 4 Released

Java Persistence: JBoss EJB 3.0 Preview 4 Released

As JBoss World 2005 enters it second day in Atlanta, Georgia - with SYS-CON.TV (http://www.sys-con.tv) in attendance, so stand by later today for the video of Marc Fleury's opening keynote - JBoss EJB 3.0 Preview 4 has been released, with numerous bug fixes and a few new features.

Project lead Bill Burke, JBoss's Chief Architect, who reminds that you must have JDK 5.0 to use EJB 3.0, described the new extensions as follows:

  • @Service EJBs - Singleton EJBs that can hold stand and are multi threaded. As was as being able to publish traditional @Local/@Remote interfaces, they can also publish JMX @Management interfaces and hook into JBoss lifecycle and dependency injection.
  • Message Driven POJOs - These are Message Driven Beans with a typed producer and consumer interfaces. Work with JMS through regular business method calls
  • Lightweight Asynchronous EJBs - Any EJB reference can be transformed into an asynchronous proxy where you can invoke on methods and receive responses asynchronously. No changes to bean class or bean interfaces required.

The Version Preview 4 release notes are here. EJB 3 is expected to continue as the sole persistence mechanism for Java.

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Most Recent Comments
obsbrver 03/03/05 07:12:16 AM EST

Intersting to see that Marc Fleury is avowedly in it for the money, so that 'professional' in open source now means dollars rather than expertise

Video Keynote 03/02/05 03:33:54 PM EST

I'm watching Martin Fink from HP at http://sys-con.tv/live and he's just been showing a great video...this is almost like being there at the keynote! "It's not just about Linux...it's about Open Source," he says. Amen to tbat!!

rossifer 03/02/05 08:54:19 AM EST

JDO's real problem is that it pretends that there's no need for relational programming now that we've got object oriented programming and it's another restatement of the object-oriented database. Relational programming has several distinct advantages over OO programming in several problem areas, the most obvious being arbitrary search (which the OO model intentionally prevents with encapsulation). True object relational mapping tools don't make this mistake. They let the object model do what it's good at, the data model do what it's good at, and then help them talk to each other.

oops 03/02/05 08:24:16 AM EST

My main gripe with EJBs is that once you use them you're tied to a platform. That platform is an application server.

Using JDO (or Hibernate or other solutions) allows you to deploy your solution inside an app container, inside a web container, or simply standalone.

The biggest benefit I've seen from deploying standalone comes from unit testing (using JUnit). My most recent projects have all had sizeable sets of standalone functionality tests. Once those several hundred tests succeed in a standalone context I can then deploy into my container and perform further tests using Cactus. But the majority of testing takes place outside without any deployment grief or the extra pain of writing client/server (Cactus) tests.

kisrael 03/02/05 08:22:08 AM EST

I've heard that JDO is much better, tighter solution to O/R mapping than EJB Entity Beans, that the latter are designed to be SO flexible that you can use them as a wrapper to your legacy mainframes, but the former is a lot closer to the problem most Java folks need to solve. Anyone know if that's a reasonable viewpoint?

Professional OS 03/02/05 08:09:14 AM EST

Busy time for JBoss this week! :)

EJB 3 preview4 03/02/05 07:49:32 AM EST

These extensions seem pretty cool

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