Native support for play framework application
There are a couple of disadvantages to this approach.
Mainly that you cannot take profit of play framework support for asynchronous requests (something that linkedIn engineers found quite valuable). More over, the first time you deploy, it takes quite a lot of time, because of the play libs.
The fact is that Play! uses Netty, a non-blocking I/O protocol library built by the JBoss team. It combines non-blocking I/O with an elegant continuation-based programming model to deliver asynchronous processing of requests.
So Openshift would be particularly suitable for native play support, and Netty is indeed the deployment option recommended by play developers. Moreover, other PaaS cloud solutions are already provinding native support for Play Framework, like Heroku (they use Jetty, and adapted it to play framework) and Jelastic, which recently added play framework support (it was the most voted features with more than 500 votes).
I guess that having Netty among Jboss stack would certainly make things easier... am I right?