I managed to prepare an installer for my application using JWrapper.
I can install the dmg on my MAC.
When I run it, I am not able to access the data because of this error in HibernateUtil class. Everything works well in the IDE, even I run the .jar itself.
Here is the error
You guided me in the right direction.
I noticed that it was a libraries conflict. A hibernate core library part of Jasper conflicting with the main hibernate library (core).
It is now working.