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Saturday, January 29, 2011

Play Framework

As some of you may know, I spent some time doing some significant development with the Play Framework. I have to say that I think the Play Framework has surpassed my experiences with Spring and Spring Roo. That’s not to say that Spring and similar aren't decent frameworks, but I have been particularly impressed with the feedback loop provided by Play. It has, without a doubt, the most direct code-test-cycle I have seen in any platform for Java (it approaches the instant feedback of Rails), and also has the distinct advantage of being stateless out-of-the-box (something Spring and Wicket are definitely lacking). Beyond this I fnd the distinct lack of XML declarations a refreshing change. If you have ever had to configure Hibernate and the like in a Spring application you will know what I mean.
Play manages this feedback loop problem in a rather novel way – embedded in the framework is the Eclipse compiler for Java (ECJ). This means that when you’re coding for the play framework, you’re not sending it your class files, but rather your source files. This allows Play to recompile code in a running instance on the fly – I literally only restarted my application a handful of times while I was coding over the course of several days. It also integrates seamlessly with IDEs, and ships with an embedded HTTP runtime (no deployment is necessary during development).
There are a number of other benefits Play can provide by working with source files instead of class files. Much like Rails ability to add functionality to your application at runtime, Play can (and does) pre-process certain Java classes to add functionality.
Play is now fully supports Scala, which would allow for other modern language features to be used with this highly interactive framework.
It’s hard to describe all of the neat features Play provides in a few hundred words, but I would highly recommend you check it out – they have a 10 minute screencast they sells it better than I can. While I’m still convinced Java (as a language) will be surpassed for an overwhelming majority of the web-development as the language continues to stagnate, this is a compelling framework for the Java platform as a whole, even if Java isn’t your language of choice.


opensas said...

have you developed a whole app with play? pls tell us about it

Ethan Smith said...
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