finally put the pom in a shape, that it now produces via assembly a fully downwards compatible sikuli-script.jar. The standard jar produced is called sikuli-japi.jar and only contains the sikuli Java and Python stuff and the antive libraries (intended for pure Java use or other Java aware environments). Whats missing in the moment: ALL libs in META-INF/libs should be copied to the outside to the folder $SIKULI_HOME/libs (whatever is identified by Sikuli as SIKULI_HOME at runtime), so All stuff needed is contained in the jar.