HHH90001006：缺少缓存 [default-update-timestamps-region] 是即时创建的答案

【问题标题】：HHH90001006: Missing cache[default-update-timestamps-region] was created on-the-flyHHH90001006：缺少缓存 [default-update-timestamps-region] 是即时创建的
【发布时间】：2021-08-31 17:29:22
【问题描述】：

一个简单的Spring Boot 2.5 application，带有 EhCache 3 的 Spring Data JPA 和启用了查询和二级缓存的 Hibernate 5：

spring.jpa.properties.hibernate.cache.use_query_cache=true
spring.jpa.properties.hibernate.cache.use_second_level_cache=true

在启动时为每个缓存生成来自 Hibernate 的警告和来自 EhCache 的信息消息：

WARN org.hibernate.orm.cache          HHH90001006: Missing cache[default-update-timestamps-region] was created on-the-fly. The created cache will use a provider-specific default configuration: make sure you defined one. You can disable this warning by setting 'hibernate.javax.cache.missing_cache_strategy' to 'create'.
INFO org.ehcache.core.EhcacheManager  Cache 'default-update-timestamps-region' created in EhcacheManager.

和

WARN org.hibernate.orm.cache          HHH90001006: Missing cache[default-query-results-region] was created on-the-fly. The created cache will use a provider-specific default configuration: make sure you defined one. You can disable this warning by setting 'hibernate.javax.cache.missing_cache_strategy' to 'create'.
INFO org.ehcache.core.EhcacheManager  Cache 'default-query-results-region' created in EhcacheManager.

这些 Hibernate 缓存的正确 EhCache 配置是什么？

【问题讨论】：

标签： java spring hibernate caching ehcache

【解决方案1】：

这里有一个很好的解释：https://www.ehcache.org/documentation/2.8/integrations/hibernate.html#configure-

如果您希望这些警告消失，您可以在 ehcache.xml 中明确定义缓存，或者使用 create 配置值作为警告日志。

【讨论】：

我重写了这个问题，使其更加清晰/直接。问题是这些 Hibernate 缓存的正确 EhCache 配置是什么……所以首先是 Hibernate 需要什么，然后是如何使用 EhCache 3 实现的问题。
正确是什么意思？只需添加例如<cache name="default-update-timestamps-region"/> 和 <cache name="default-query-results-region"/> 到 ehcache.xml。如果您想知道要配置哪些值，请查看 wildfly 在其 standalone-ha.xml 中为 <cache-container name="hibernate"/> 配置的内容。
这里的关键是根据Hibernate禁用时间戳缓存的过期。

【解决方案2】：

Disable expiration on the default-update-timestamps-region cache as recommended by Hibernate:

@Configuration @EnableCaching
public class ApplicationConfiguration {
    @Bean
    public CacheManager ehCacheManager() {
        CacheManager cacheManager = Caching.getCachingProvider().getCacheManager();

        hibernateDefaultUpdateTimestampsRegionConfiguration(cacheManager);
        hibernateDefaultQueryResultsRegion(cacheManager);

        return cacheManager;
    }

    /**
     * Create Hibernate's default-update-timestamps-region cache. No expiration per Hibernate recommendation:
     * https://github.com/hibernate/hibernate-orm/blob/main/documentation/src/main/asciidoc/userguide/chapters/caching/Caching.adoc#query-cache-regions
     *
     * @param cacheManager
     */
    private void hibernateDefaultUpdateTimestampsRegionConfiguration(CacheManager cacheManager) {
        CacheConfigurationBuilder<Object, Object> builder = CacheConfigurationBuilder
                .newCacheConfigurationBuilder(Object.class, Object.class,
                        ResourcePoolsBuilder.newResourcePoolsBuilder().offheap(1, MemoryUnit.MB));

        javax.cache.configuration.Configuration<Object, Object> cache = Eh107Configuration.fromEhcacheCacheConfiguration(builder);

        cacheManager.createCache("default-update-timestamps-region", cache);

        //cacheManager.createCache("default-update-timestamps-region", new MutableConfiguration<>());
    }

    /**
     * Create Hibernate's default-query-results-region cache.
     * https://github.com/hibernate/hibernate-orm/blob/main/documentation/src/main/asciidoc/userguide/chapters/caching/Caching.adoc#query-cache-regions
     *
     * @param cacheManager
     */
    private void hibernateDefaultQueryResultsRegion(CacheManager cacheManager) {
        CacheConfigurationBuilder<Object, Object> builder = CacheConfigurationBuilder
                .newCacheConfigurationBuilder(Object.class, Object.class,
                        ResourcePoolsBuilder.newResourcePoolsBuilder().offheap(1, MemoryUnit.MB));

        javax.cache.configuration.Configuration<Object, Object> cache = Eh107Configuration.fromEhcacheCacheConfiguration(builder);

        cacheManager.createCache("default-query-results-region", cache);

        //cacheManager.createCache("default-query-results-region", new MutableConfiguration<>());
    }

}

【讨论】：