Sunday, December 13, 2009

Java EE 6 - Gee, 6?

Java Enterprise Edition 6 was just released, even with Oracle's possible acquisition of Sun looming on the horizon. In the past I've seen J2EE and Java 5 EE releases come and go whilst I went on not caring. It wasn't because I didn't need anything more than Java's Standard Edition... I do... but the Java Enterprise Edition releases always seemed to be released with features I needed nine months ago and found in other frameworks.

I decided to take more of a look within this release and give it a fair shake. This release had a lot of nice stuff but was still playing catch-up with other tech: JPA starts catching up with the functionality offered by Hibernate, JAX-RS (RESTful Web Services) is finally produced as an answer to the myriad of other REST frameworks and dependency injection finally gets introduced into Java proper. All of these additions are features that were already offered by alternate libraries over a year ago (some of them more than five years ago) and are just now becoming standard.

Inversion of Control isn't the only elder pattern that finally debuts in Java EE 6. Asynchronous responses appear throughout the new Enterprise Edition, finally allowing threads to stop blocking subsequent operations. Asynchronous processing is finally available in the Servlet 3.0 spec so inbound HTTP requests don't have to hang forever while they await all the info to formulate a response. Session Beans can now be invoked asynchronously so EJB execution doesn't consume a client thread and eat up threadpools. JSF now has AJAX support for asynchronous webapp calls. REST-based Web Services allow for Web Service exposure with much less resource utilization and much higher concurrency through more streamlined asynchronous HTTP calls. All of these features not only have been present in alternate libraries for some time, but entire protologisms and design patterns have been honed to allow for just such asynchronicity. Comet and callback methods have been a predominant pattern for some time now, although Servlet 3.0 is the first time a Java Enterprise Edition has allowed for asynchronous Servlet processing. Now that WebSockets are becoming more prevalent Java Servlets are going to need to catch up to everyone else yet again and in short order.

Am I even tempted by this release of Java Enterprise Edition? Maybe kinda. I like annotation-based models, as I've seen how deep XML hell truly goes. JAX-RS annotations are a compelling alternative to JAX-RPC, and the new Bean Validation annotations would likely be very helpful. Asynchronous EJB invocation, along with a more minimalistic and annotation-based EJB spec, may even convince me to finally give Enterprise Java Beans a try once more.

I already use JPA, JAXB, JMS, JMX, JAAS, JAX-RPC, JavaSpaces and Servlets/JSPs/JSTL but in more of an a la carte sorta mechanism, intermingled with Spring, DWR, Hibernate and Camel. Now that I've typed the previous line... I realize that even though I've never intentionally downloaded the Java 5 EE package from Sun it seems I've been using Java Enterprise Edition all along. Weird. I guess it has slowly seeped into the crevasses of my frameworks, unintentionally filling out the rest of the libraries I use. Now that we have REST support and asynchronous context... I might walk the final yard and intentionally download it this time.

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