SpringBoot集成Redis引起的序列化问题

想必大家对SpringBoot可能已经很熟悉了，包括集成Redis这种常用的技术，之前一直用一贯的写法去集成Redis，写配置类没发现过任何问题，但是上周在给Redis配置类加了一个Bean之后就出现了很难发现的问题。

配置类代码 `@Configuration public class RedisConfig extends CachingConfigurerSupport {

[@Bean](https://my.oschina.net/bean)
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
    RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
    redisTemplate.setConnectionFactory(redisConnectionFactory);

    // 使用Jackson2JsonRedisSerialize 替换默认序列化
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

    jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

    // 设置value的序列化规则和 key的序列化规则
    redisTemplate.setKeySerializer(new StringRedisSerializer());
    redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
    redisTemplate.setHashKeySerializer(new StringRedisSerializer());
    redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
    redisTemplate.afterPropertiesSet();
    return redisTemplate;
}


[@Bean](https://my.oschina.net/bean)
public CacheManager cacheManager(RedisConnectionFactory factory) {
    RedisSerializer<String> redisSerializer = new StringRedisSerializer();
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

    //解决查询缓存转换异常的问题
    ObjectMapper om = new ObjectMapper();
    om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    jackson2JsonRedisSerializer.setObjectMapper(om);

    // 配置序列化（解决乱码的问题）,过期时间30秒
    RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
            .entryTtl(Duration.ofSeconds(1800000))
            .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
            .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
            .disableCachingNullValues();

    RedisCacheManager cacheManager = RedisCacheManager.builder(factory)
            .cacheDefaults(config)
            .build();
    return cacheManager;
}

}` 也就是增加了cacheManager()这个方法之后，数据量小的时候是没有任何问题的，但是一旦放到线上，数据量一上来，那么整个Redis就导致内存溢出，整个服务都会挂掉。

错误日志： org.springframework.data.redis.serializer.SerializationException: Cannot deserialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to deserialize payload. Is the byte array a result of corresponding serialization for DefaultDeserializer?; nested exception is java.lang.OutOfMemoryError: Java heap space at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.deserialize(JdkSerializationRedisSerializer.java:84) ~[spring-data-redis-2.1.6.RELEASE.jar!/:2.1.6.RELEASE] at org.springframework.session.data.redis.RedisOperationsSessionRepository.onMessage(RedisOperationsSessionRepository.java:538) ~[spring-session-data-redis-2.1.5.RELEASE.jar!/:2.1.5.RELEASE] at org.springframework.data.redis.listener.RedisMessageListenerContainer.executeListener(RedisMessageListenerContainer.java:250) [spring-data-redis-2.1.6.RELEASE.jar!/:2.1.6.RELEASE] at org.springframework.data.redis.listener.RedisMessageListenerContainer.processMessage(RedisMessageListenerContainer.java:240) [spring-data-redis-2.1.6.RELEASE.jar!/:2.1.6.RELEASE] at org.springframework.data.redis.listener.RedisMessageListenerContainer.lambda$dispatchMessage$0(RedisMessageListenerContainer.java:986) [spring-data-redis-2.1.6.RELEASE.jar!/:2.1.6.RELEASE] at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_191] Caused by: org.springframework.core.serializer.support.SerializationFailedException: Failed to deserialize payload. Is the byte array a result of corresponding serialization for DefaultDeserializer?; nested exception is java.lang.OutOfMemoryError: Java heap space at org.springframework.core.serializer.support.DeserializingConverter.convert(DeserializingConverter.java:78) ~[spring-core-5.1.6.RELEASE.jar!/:5.1.6.RELEASE] at org.springframework.core.serializer.support.DeserializingConverter.convert(DeserializingConverter.java:36) ~[spring-core-5.1.6.RELEASE.jar!/:5.1.6.RELEASE] at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.deserialize(JdkSerializationRedisSerializer.java:82) ~[spring-data-redis-2.1.6.RELEASE.jar!/:2.1.6.RELEASE] ... 5 common frames omitted Caused by: java.lang.OutOfMemoryError: Java heap space

至于为什么注入这个bean之后会出现这个问题，去了这个bean之后，不会再出现这个问题，目前我还没找到原因，分享出来大家一起参考，避免在网上找的配置应用在自己的代码中出现问题，也欢迎踩过坑的朋友来解答。