@Cacheable(value = "user", key="#p0")
public User find(String user) {
    return userRepository.findByUser(User);
}

@Transactional
public void updateToken(int id, String token) {
    Group group = groupRepository.findOne(id);
    group.getMembers().forEach(member -> {
        member.getUser().setToken(token);
        removeUserCacheByName(member.getUser().getName());
    });
    groupRepository.save(group);
}

@CacheEvict(value = "user", key="#p0")
public void removeUserCacheByName(String name) {
    log.debug("Removing user cache by name {}.", name);
}