Symfony2 Redis Validator，字符串而不是ClassMetadata

Question

我已经从Memcached迁移到了Redis。起初我使用的是PECL Redis 3.1.3，一切正常。更新到3.1.5后，我开始收到错误：

未捕获的php异常Symfony Component Debug Exception FatalThrowableError：“类型错误：传递给Symfony Component Validator Mapping Factory LazyLoadingMetadataFactory :: mergeConstraints（）的参数1必须是Symfony Component Validator Mapping 的实例ClassMetadata，给定的字符串，在/ var / www / acme / www上的/var/www/acme/www/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php中调用/vendor/symfony/symfony/src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php第120行

我看了，并且redis更改日志，并没有找到任何线索，两个版本更新后可能出错。

我的config.yml（只有缓存/ redis的东西）：

framework:
    validation:
        cache: validator.mapping.cache.redis
    serializer:
        cache: serializer.mapping.cache.redis
    session:
        handler_id: session.handler.redis

doctrine:
    orm:
        auto_mapping: true
        metadata_cache_driver:
            type: redis
            host: "%redis.ip%"
            port: "%redis.port%"
            instance_class: Redis
            class: RedisCache
        query_cache_driver:
            type: redis
            host: "%redis.ip%"
            port: "%redis.port%"
            instance_class: Redis
            class: RedisCache
        result_cache_driver:
            type: redis
            host: "%redis.ip%"
            port: "%redis.port%"
            instance_class: Redis
            class: RedisCache

services:
    serializer.mapping.cache.redis:
        class: DoctrineCommonCacheRedisCache

    validator.mapping.cache.redis:
        class: SymfonyComponentValidatorMappingCacheDoctrineCache
        arguments: ['@doctrine.cache.redis']

    redis:
        class: Redis
        calls:
            - [ connect, [ '%redis.ip%', '%redis.port%' ]]

    doctrine.cache.redis:
        class: DoctrineCommonCacheRedisCache
        calls:
            - [setRedis, ["@redis"]]

    session.handler.redis:
        class: SymfonyComponentHttpFoundationSessionStorageHandlerNativeSessionHandler

    serializer.mapping.cache.memcached:
        class: DoctrineCommonCacheMemcachedCache


doctrine_cache:
    providers:
        redis_cache:
            redis:
                connection_id: redis

我的symfony版本是2.8.31。有什么建议？