public static boolean isUsingNativeBullet() {
        try {
            Class clazz = Class.forName("com.jme3.bullet.util.NativeMeshUtil");
            return clazz != null;
        } catch (ClassNotFoundException ex) {
            return false;
        }
    }
Determines whether native Bullet is on the classpath.

Currently, the context extracts the native Bullet libraries, so
this method is needed to determine if they are needed.
Ideally, native Bullet would be responsible for its own natives.

@return True native bullet is on the classpath, false otherwise.
jme3-desktop/src/main/java/com/jme3/system/NativeLibraryLoader.java