protected static void loadDefaultMappings() {
        for (String s : searchPaths) {
            try {
                loadMappings(s);
            } catch (IOException e) {
                logger.log(Level.SEVERE, "Error searching resource path:{0}", s);
            }
        }
    }
Loads the default compatibility mappings by looking for
joystick-mapping.properties files on the classpath.
jme3-core/src/main/java/com/jme3/input/JoystickCompatibilityMappings.java