class com.alibaba.fastjson.JSONObject cannot be cast to class cn.cai.domain.User (com.alibaba.fastjson.JSONObject and cn.cai.domain.User are in unnamed module of loader 'app')

[caishenao]

依赖:

<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>2.0.14</version>
  </dependency>

public class FastJsonRedisSerializer<T> implements RedisSerializer<T> {

    public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
    private final Class<T> clazz;

    public FastJsonRedisSerializer(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }
     // 序列化
    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (null == t) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }
    // 反序列化
    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (null == bytes || bytes.length <= 0) {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);
        return (T) JSON.parseObject(str, clazz);
    }
}

配置：

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        // 设置序列化
        //使用fastjson序列化
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<Object>(Object.class);
        // 配置redisTemplate
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        // 连接工厂
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        //
        RedisSerializer<?> stringSerializer = new StringRedisSerializer();
        // key序列化
        redisTemplate.setKeySerializer(stringSerializer);
        // value序列化
        redisTemplate.setValueSerializer(fastJsonRedisSerializer);
        // Hash key序列化
        redisTemplate.setHashKeySerializer(stringSerializer);
        // Hash value序列化
        redisTemplate.setHashValueSerializer(fastJsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
}

反序列化时错误，小白，百度、谷歌都未解决

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.19 请用新版本验证，如果问题仍然存在，请在这里( https://github.com/alibaba/fastjson2/issues )提issue

[DistChen]

https://github.com/alibaba/fastjson2/releases/tag/2.0.19 请用新版本验证，如果问题仍然存在，请在这里( https://github.com/alibaba/fastjson2/issues )提issue

FastJsonRedisSerializer

@wenshao 认真的么，这个里面都没有这个 FastJsonRedisSerializer 类：

<dependency>
	<groupId>com.alibaba.fastjson2</groupId>
	<artifactId>fastjson2</artifactId>
	<version>2.0.19</version>
</dependency>

[DistChen]

@caishenao 改用 GenericFastJsonRedisSerializer 应该就没问题了。

[mdddj]

同样的问题