Hi Yogeen,
The easiest way to do this, use run ant "create.user.webapp" on the build file present in install folder it gives u a user-webapp structure created (normal web app structure) with dependency library copied in WEB-INF/lib folder.
This means you are using jBPM as just another library in your web-app. If you are integrating it with Spring you will get lots of help. And its easy to integrate it with Spring.
Ping back if you need further.
Cheers!
Puneet