I'm starting a new project on B4J, that will run on Windows and Linux desktops. The app needs to use a 3rd party external library (.DLL and .SO).
What is the best way for writing this app? Create a wrapper of DLL and .SO and use it depending on target OS?
There is any tutorial about building these wrappers?
Sounds like you need to create a Java wrapper before creating a "B4J" wrapper. Once you have a Java jar, you can access it using JavaObject, inline Java or with a wrapper.