Hello,
If you want to start a proecss from your application, http://jbpmbasics.blogspot.in/2012/10/jbpm-integration-in-web-application.html#!/2012/10/jbpm-integration-in-web-application.html can help.
That link hints at integrating basic JBPM libraries in your application so that client requests hiting your application get a chance to start the processes.
In order to monitor your processes in a cluster aware way, I am myself trying to figure that out though it can be pretty straightforward if you have only 1instance of your app (server) running.
Regards.
Jatin