I appreciate the project, but unless you explain what are you trying to achieve with that, I will need to spend some time to understand your test, that contains a main class instead of assertions, so it is pretty time consume to understand what is doing.
There might be an incompatibility, so let's try to find out what it is.
Can you please explain a little bit of the context of what you are trying to achieve?
Are you trying to benchmark the job executor?
because in my experience and as part of Activiti Cloud, we are going to delegate those responsibilities to production ready components. It might be a good time, if you are looking at the EA of 7 you might want to look at RFC: Activiti Cloud Connectors – Salaboy (Open Source Knowledge)
It is a very good time to get involved and shape the future of the project, so if you are interested get in touch.