Execute Pig from within Java Application
It seems there is Java API for Pig.
According to this API, there is a PigRunner class.
With that, you could easily add it to your Spring application, by creating a dedicated Spring bean.
From what I've seen document wise and example wise is to you the PigServer class. They have examples of using it here: http://pig.apache.org/docs/r0.8.1/setup.html#Sample+Code