I have been trying to model a workflow for one of my applications. I started with Bossa, but after getting stuck using parts of its API, I was well on my way to designing my own workflow engine using Bossa's Petri Net abstraction, until a colleague pointed out that I was trying to re-invent something for which solid, mature implementations already existed in the open-source world, and that, down the road, other developers would curse me for having stuck them with having to maintain this component.
