Hi Renzo,
Those examples try to demonstrate different functionalities of the jBPM engine.
All the examples there are JUnit Tests that create a business process and assert the diferent states of the process. Except for the first example that is a community contribution all the rest are just Unit Tests.
About the ex03_greetings.bpmn the process graph looks like:
http://community.jboss.org/servlet/JiveServlet/downloadImage/2-623478-16928/362-451/Screen+Shot+2011-08-29+at+10.00.30+AM.png
And yes.. if you want to continue the process you need to signal the event.
We definitely need to improve those examples and move them to Junit.
Cheers
