redisTemplate.delete()不能删除元素

最近在学习redis，使用spring-data-redis的RedisTemplate.delete()方法删除时，添加是成功的，但是不能删除。

代码如下

public abstract class AbstractBaseRedisDao {
    @Autowired
    protected RedisTemplate redisTemplate;

//    public void setRedisTemplate(RedisTemplate redisTemplate) {
//        this.redisTemplate = redisTemplate;
//    }

    public RedisSerializer getRedisSerializer() {
        return redisTemplate.getStringSerializer();
    }
}

public interface IUserDao {
    boolean add(User user);

    void delete(String key);

    void delete(List keys);

    User get(String keyId);
}

@Service
public class UserDao extends AbstractBaseRedisDao implements IUserDao {
    public boolean add(final User user) {
        boolean result = redisTemplate.execute(new RedisCallback() {
            public Boolean doInRedis(RedisConnection redisConnection) throws DataAccessException {
                RedisSerializer serializer = getRedisSerializer();
                byte[] key = serializer.serialize(user.getId());
                byte[] name = serializer.serialize(user.getName());
                return redisConnection.setNX(key, name);
            }
        });
        return result;
    }

    public void delete(String key) {
        List list = new ArrayList();
        list.add(key);
        delete(list);
    }

    public void delete(List keys) {
        redisTemplate.delete(keys);
    }

    public User get(final String keyId) {
        User result = redisTemplate.execute(new RedisCallback() {
            public User doInRedis(RedisConnection redisConnection) throws DataAccessException {
                RedisSerializer serializer = getRedisSerializer();
                byte[] key = serializer.serialize(keyId);
                byte[] value = redisConnection.get(key);
                if (value == null) {
                    return null;
                }
                String name = serializer.deserialize(value);
                return new User(keyId, name, null);
            }
        });
        return result;
    }
}

配置如下：

测试用例：

public class RedisTest {
    private IUserDao userDao;

    @Before
    public void init() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("case1/applicationContext.xml");
        userDao = (IUserDao) ctx.getBean("userDao");
    }

    @Test
    public void testAddUser() {
        User user = new User();
        user.setId("B");
        user.setName("B");
        boolean result = userDao.add(user);
        Assert.assertTrue(result);
    }

    @Test
    public void testDelete() {
        String key = "B";
        User user = userDao.get(key);
        System.out.println("删除前：" + user);
        userDao.delete(key);
        user = userDao.get(key);
        System.out.println("删除后：" + user);
    }
}