spring-boot-devtools从缓存中获取ClassCastException。

问题描述

从缓存中获取值时我遇到问题。

I am facing issue while getting value from cache.

java.lang.RuntimeException: java.lang.ClassCastException: com.mycom.admin.domain.User cannot be cast to com.mycom.admin.domain.User

缓存配置

@Configuration
@EnableCaching
@AutoConfigureAfter(value = { MetricsConfiguration.class, DatabaseConfiguration.class })
@Profile("!" + Constants.SPRING_PROFILE_FAST)
public class MemcachedCacheConfiguration extends CachingConfigurerSupport {

    private final Logger log = LoggerFactory.getLogger(MemcachedCacheConfiguration.class);

    @Override
    @Bean
    public CacheManager cacheManager() {
        ExtendedSSMCacheManager cacheManager = new ExtendedSSMCacheManager();
        try {
            List<SSMCache> list = new ArrayList<>();
            list.add(new SSMCache(defaultCache("apiCache"), 86400, false));
            cacheManager.setCaches(list);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return cacheManager;
    }


    @Override
    public CacheResolver cacheResolver() {
        return null;
    }

    @Override
    public CacheErrorHandler errorHandler() {
        return null;
    }

    private Cache defaultCache(String cacheName) throws Exception {
        CacheFactory cacheFactory = new CacheFactory();
        cacheFactory.setCacheName(cacheName);
        cacheFactory.setCacheClientFactory(new MemcacheClientFactoryImpl());
        String serverHost = "127.0.0.1:11211";
        cacheFactory.setAddressProvider(new DefaultAddressProvider(serverHost));
        cacheFactory.setConfiguration(cacheConfiguration());
        return cacheFactory.getObject();
    }

    @Bean
    public CacheConfiguration cacheConfiguration() {
        CacheConfiguration cacheConfiguration = new CacheConfiguration();
        cacheConfiguration.setConsistentHashing(true);
        return cacheConfiguration;
    }

}

并附注

@Cacheable(value = "apiCache#86400", key = "'User-'.concat(#login)")

我正在使用com.google.code.simple-spring-memcached 3.5.0

I am using com.google.code.simple-spring-memcached 3.5.0

值正在缓存但是在获取应用程序时会抛出类强制转换错误。什么是可能的问题。

Value is getting cached but while getting application throws class cast error. What would be the possible issues.

推荐答案

这是。反序列化缓存条目时，该对象未附加到正确的类加载器。

This is a known limitation of Devtools. When the cache entry is deserialized, the object is not attached to the proper classloader.

有多种方法可以解决此问题：

There are various ways you can fix this issue:

1. 在开发中运行应用程序时禁用缓存


2. 使用其他缓存管理器（如果您使用的是Spring Boot 1.3） ，您可以使用应用程序中的 spring.cache.type 属性强制使用简单缓存管理器-dev.properties 并在IDE中启用dev配置文件）


3. 将memcached（以及缓存的内容）配置为。我不推荐这个选项，因为上面的两个更容易实现

1. Disable cache when you're running your application in development
2. Use a different cache manager (if you're using Spring Boot 1.3, you could force a simple cache manager using the spring.cache.type property in application-dev.properties and enable the dev profile in your IDE)
3. Configure memcached (and things that are cached) to run in the application classloader. I wouldn't recommend that option since the two first above are much easier to implement

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