docs: public static UserInfo getUserInfo(final String userId) {
  
          if (userId == null) {
              throw new IllegalArgumentException("null userName");
          }
  
          try {
              Class<?> accessor = Class.forName("com.sap.security.um.service.UserManagementAccessor");
              if (accessor != null) {
                  Object users = MethodUtils.invokeExactStaticMethod(accessor, "getUserProvider", null);
                  if (users != null) {
                      Object user = MethodUtils.invokeExactMethod(users, "getUser", userId);
                      if (user != null) {
                          // get user name and email
                          return new User(
                                  userId,
                                  (String) MethodUtils.invokeExactMethod(user, "getAttribute", "firstname"),
                                  (String) MethodUtils.invokeExactMethod(user, "getAttribute", "lastname"),
                                  (String) MethodUtils.invokeExactMethod(user, "getAttribute", "email"));
  
                      }
                  }
              }
          } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
              log.warn(e.getMessage());
          }
          return new User(userId, "", "", "");
      }