如何配置Spring Cache忽略缓存序列化错误?

Question

我使用Spring Cache与Redis/JDK序列化作为缓存后端。我有一个方法，其结果被缓存，缓存中填充了一些值。在对我的应用程序的更新中，我正在以一种破坏Java反序列化的方式改变缓存对象的类(将成员的类型从List更改为Set)。现在任何调用我的缓存方法失败与org.springframework.data.redis.serializer.SerializationException。

@Cacheable(cacheNames = "myCache", cacheManager = "myCacheManager)
public SomeObject myCachedMethod(String param) {
    return ...;
}

堆栈跟踪:

Caused by: 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.ClassCastException: cannot assign instance of java.util.ArrayList to field SomeObject.foo of type java.util.Set in instance of SomeObject
    at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.deserialize(JdkSerializationRedisSerializer.java:41) ~[spring-data-redis-1.6.4.RELEASE.jar:na]
    at org.springframework.data.redis.cache.RedisCache$CacheValueAccessor.deserializeIfNecessary(RedisCache.java:378) ~[spring-data-redis-1.6.4.RELEASE.jar:na]
    at org.springframework.data.redis.cache.RedisCache.get(RedisCache.java:144) ~[spring-data-redis-1.6.4.RELEASE.jar:na]
    at org.springframework.data.redis.cache.RedisCache.get(RedisCache.java:94) ~[spring-data-redis-1.6.4.RELEASE.jar:na]
    at org.springframework.cache.interceptor.AbstractCacheInvoker.doGet(AbstractCacheInvoker.java:68) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.cache.interceptor.CacheAspectSupport.findInCaches(CacheAspectSupport.java:466) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.cache.interceptor.CacheAspectSupport.findCachedItem(CacheAspectSupport.java:432) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:336) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:302) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61) ~[spring-context-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at com.sun.proxy.$Proxy175.myCachedMethod(Unknown Source) ~[na:na]

是否有一种方法可以配置Spring缓存以在反序列化对象时忽略错误并让方法调用通过?

Answer 1

在阅读了Spring的代码后找到了解决方案。

缓存层处理发生在org.springframework.cache.interceptor.CacheErrorHandler的一个实例中。默认情况下，Spring使用org.springframework.cache.interceptor.SimpleCacheErrorHandler，它会抛出所有异常。为了放松这一点，可以扩展该类并记录/忽略缓存获取异常(这会导致它们像缓存丢失一样被处理):

@Configuration
@EnableCaching
public class CacheConfiguration extends CachingConfigurerSupport {
    @Slf4j
    private static class RelaxedCacheErrorHandler extends SimpleCacheErrorHandler {
        @Override
        public void handleCacheGetError(RuntimeException exception, Cache cache, Object key) {
            log.error("Error getting from cache.", exception);
        }
    }
    @Override
    public CacheErrorHandler errorHandler() {
        return new RelaxedCacheErrorHandler();
    }
    // More config...
}