run play 2.3 in cloud9

For play 2.3 or above, run the below command in terminal:

 activator run -Dhttp.address=$IP -Dhttp.port=$PORT run

How to get the play version for scala.

type below in your terminal

activator console

or

play console

In scala console,

type

play.core.PlayVersion.current

It will display the play version you use.