我正在尝试使用Redis缓存来提高我们的应用程序的性能。我引用了这个article作为我的实现。我得到了这个异常：

class com.entity.UserEntity cannot be cast to class com.entity.UserEntity

重新配置：

@Configuration
@EnableCaching
public class RedisConfig {

    @Value("${spring.redis.port}") int redisPort;
    @Value("${spring.redis.host}") String redisHost;

    @Bean
    public LettuceConnectionFactory redisLettuceConnectionFactory() {
        RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration(redisHost,redisPort);
        return new LettuceConnectionFactory(redisStandaloneConfiguration);
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisLettuceConnectionFactory());

        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new JdkSerializationRedisSerializer());
        redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
        redisTemplate.setEnableTransactionSupport(true);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
}

用户实体：

@Entity
@Getter
@Setter
@EqualsAndHashCode(callSuper=false)
@Slf4j
@Table(name="user")
public class UserEntity extends BaseEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "user_id")
    @Type(type = "uuid-char")
    private UUID userId;//Binary in DB and UUID here

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "user", orphanRemoval = true, cascade= CascadeType.ALL)
    @JsonIgnore
    @ToStringExclude
    @Fetch(value = FetchMode.SUBSELECT)
    private List<EmailAddress> emailAddresses = new ArrayList<>();
   .
   .
   .
}

用户道实现

@Repository
public class UserDaoImpl implements UserDao {

    private UserRepository userRepository;
    private HashOperations hashOperations; //to access Redis cache
    private static final String KEY = "User";

    public UserDaoImpl(@Autowired RedisTemplate<String, Object> redisTemplate, @Autowired UserRepository userRepository) {
        this.userRepository = userRepository;
        hashOperations = redisTemplate.opsForHash();
    }

    @Override
    public Optional<UserEntity> fetchUserById(String userId) throws Exception {

// Getting Exception here (UserEntity) hashOperations.get(KEY,userId)
        UserEntity userEntity = (UserEntity) hashOperations.get(KEY,userId);
        Optional<UserEntity> userOptional = Optional.ofNullable(userEntity);
        if(!userOptional.isPresent()) {
            userOptional = userRepository.findByUserId(userId);
            if (userOptional.isPresent()) {
                System.out.println("Cache Miss User id:" + userOptional.get().getUserId());

                hashOperations.put(KEY, userOptional.get().getUserId().toString(), userOptional.get());
            } else {
                throw new Exception("User not present");
            }
        }
        return userOptional;
    }
}

我可以成功地将UserEntity该高速缓存中，但是在检索时，我遇到了上面提到的异常。最有可能的原因是Hibernate。当我们第一次缓存实体时，它会将Proxy/PersistentBag放在Collections的位置，所以下次（在其他会话中）当我们从缓存中检索对象时，我们无法将其转换为所需的实体。是否有人确认这是问题所在？如果是，如何解决？