code: public static List<Class<?>> getClassesForPackage(Package pkg, Class classForClassLoader) throws IOException
      {
          return getClassesForPackage(pkg.getName(), classForClassLoader);
      }
docs: Adds and returns all classes contained in the given package (and its
  sub-packages).
  
  @param pkg
  @param classForClassLoader
  @return
  @throws IOException