Since the release 4.1 of JBPM you can create your BPMN models (which is stored as jBPM JPDL) using a cool Web editor.
In order to install the Signavio Web editor, all you have to do is:
From the JBPM_HOME/install launch:
ant install.signavio.into.jboss
This will create a Web application named jbpmeditor.war in your deploy server target.
Now start-up JBoss AS an launch the Web editor with:
http://localhost:8080/jbpmeditor/p/explorer
(A cool video demostrating how to model a process with the Web editor is available at
http://www.jorambarrez.be/files/blog/sneak_peek_web_modeler/)
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