Intercept another web application requests

I have 2 ear application (Primary and Proxy). The primary application is build using Servlet JSP MVC.

Now, I want to create a Proxy application (ear app) to listen and log all the requests and response going and coming from the Primary application.

I cannot modify the Primary application, have only control on the Proxy application that I am writing.

Can I write a simple Servlet Filter to listen all the requests on my primary application.

Note: Both the applications will run in WAS, may be same ports can be configured.