Hello,
The processes that you create are stored in Guvnor repository. These processes have to be accessed and started, as a result orchestrated, by the jbpm engine. You have two choices,
1. Use your own instance of the engine with your own configuration etc ( for example the code you have posted).
2. Use 'jbpm-gwt-console-server, which is a web application having all code and configurations needed for the jbpm engine to run.
I understand that whatever the approach, you want a "fire and forget" solution. Such a solution is achieved by running an application as a service (i.e. run constantly and listen on a port of your system - not very nice) or as a server (i.e. create web application and deploy on an application server like jboss - then you have to use http calls to communicate with it - i.e. web services).
Approach 2 above is ready out of the box (you have the engine running on a server and the communication methods - REST API - ready for you) and you have to communicate via REST.
p.s. whatever the approach you will be getting all your definitions and resources from the repository of Guvnor