*
     * @param packageName
     *            The package name.
     * @return The directory name.
     */
    protected static String toDirectoryName(final String packageName) {
        if (StringUtil.isEmpty(packageName)) {
            return null;
        }
        return packageName.replace('.', '/') + '/';
    }

    /**

  }

  private List<Class<?>> loadClassesInPackage() throws IOException {
    List<Class<?>> classes = new ArrayList<>();
    String packageName = getClass().getPackage().getName();
    for (ClassPath.ClassInfo classInfo :
        ClassPath.from(getClass().getClassLoader()).getTopLevelClasses(packageName)) {
      Class<?> cls;
      try {
        cls = classInfo.load();
      } catch (NoClassDefFoundError e) {

  }

  private List<Class<?>> loadClassesInPackage() throws IOException {
    List<Class<?>> classes = new ArrayList<>();
    String packageName = getClass().getPackage().getName();
    for (ClassPath.ClassInfo classInfo :
        ClassPath.from(getClass().getClassLoader()).getTopLevelClasses(packageName)) {
      Class<?> cls;
      try {
        cls = classInfo.load();
      } catch (NoClassDefFoundError e) {