Redis 无法反序列化对象答案

【问题标题】：Redis unable to deserialize objectRedis 无法反序列化对象
【发布时间】：2021-02-08 17:25:17
【问题描述】：

我已将 Redis 缓存添加到我的项目中，并且缓存本身可以工作，但加载缓存的值失败，并出现以下异常：

java.lang.ClassCastException: class com.dto.FilterOptionsDto cannot be cast to class 
com.dto.FilterOptionsDto (com.dto.FilterOptionsDto is in unnamed module of loader 'app'; 
com.dto.FilterOptionsDto is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @3d0da857)
at ....

缓存配置

@Configuration
@EnableConfigurationProperties({CacheProperties.class})
public class RedisConfig {

    @Bean
    RedisCacheManagerBuilderCustomizer redisCacheManagerBuilderCustomizer(CacheProperties cacheProperties) {
        return builder -> {
            Map<String, RedisCacheConfiguration> configurationMap = new HashMap<>();
            configurationMap.put(CacheNames.IDP_USER_PROFILES, RedisCacheConfiguration.defaultCacheConfig()
                    .entryTtl(Duration.ofSeconds(cacheProperties.getIdpUserProfilesTtlSeconds())));
            configurationMap.put(CacheNames.STIBO_STORES_FILTER_OPTIONS, RedisCacheConfiguration.defaultCacheConfig()
                    .entryTtl(Duration.ofSeconds(cacheProperties.getIdpUserProfilesTtlSeconds())));
            builder.withInitialCacheConfigurations(configurationMap);
        };
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(new LettuceConnectionFactory());
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }

}

缓存使用

    @Override
    @Cacheable(value = CacheNames.STIBO_STORES_FILTER_OPTIONS)
    public FilterOptionsDto getStoresFilterOptions(CountryEnum country, boolean includeClosedStores, boolean includeSingleOptions) {

注意：FilterOptionsDto 实现可序列化。我发现序列化的值被保存到redis db中，但是每当spring试图反序列化它时，它就会失败。

类似问题：Problem in deserialize redis-cache to objects in Spring-boot

【问题讨论】：

标签： spring-boot caching redis

【解决方案1】：

解决方案很奇怪，但很简单——删除devtools 依赖。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
</dependency>

【讨论】：