- the form rendering as in Activiti Explorer does NOT work for jsf. It is Vaadin based, not JSF.
- if you want to do it yourself you have to indeed put a reference to something jsf-specific in the form key.
You will need to get the form key through the formService of Activiti, and do some JSF magic with it to find the right page.
Afterwards, you need to call the formService.submit method.