Hi,
implementation of handlers can be found i folder Tasks/NAMEOFTASK/lib/file.jar, in this jar file is handler.java and handler.class files. For testing, there were created only simple executable processes consisting of start node, end node and two service tasks, but for demonstration I made 2 processes using this tasks:
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-818449-20829/450-107/delivery.jpg
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-818449-20830/450-162/meeting.jpg
Lenka
