Juniper entered the realm of application firewalling since the release of Junos 11.4 (for SRX platforms). A realm that is mainly dominated by Palo Alto (they basically invented it) and Checkpoint, but more and more vendor's are starting to move in on that territory.
And Juniper is one of those vendors that started to implement Application Firewalling (AppFW) on their (SRX) firewalls. 

This post will show what needs to be done to enable AppFW, and how to configure those policies by using the J-Web interface and the CLI. The Junos software used in this exercise is version 12.1X44.4.