@Transactional
	@Cacheable(value = DIST_CACHE_USERS, key = "#userId")
	@Override
	public User getOne(String userId) {
		return userRepository.findOneByUserId(userId);
	}
Get user by user id.

@param userId user id
@return user
ngrinder-controller/src/main/java/org/ngrinder/user/service/UserService.java