StringRedisTemplate操作Redis时抛: Unexpected token (VALUE_STRING)

用spring的StringRedisTemplate操作Redis的list结构. 存入时正常, 取数时报了下面的异常,异常已经解决, 但是疑惑原理. 不知道有没有遇到过, 并且知道详细原因的?

异常报错

`Unexpected token (VALUE_STRING), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.util.Date`

解决方案
 

将配置类的 om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); 注释掉.

配置文件
 

@Bean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        // 注释这行配置, 解决 `Unexpected token (VALUE_STRING), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.util.Date`
//        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }