java 在 JBoss 4.2 上使用 JPA 启用 Hibernate 二级缓存
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Enabling Hibernate second-level cache with JPA on JBoss 4.2
提问by Peter Hilton
What are the steps required to enable Hibernate's second-level cache, when using the Java Persistence API (annotated entities)? How do I check that it's working? I'm using JBoss 4.2.2.GA.
使用Java Persistence API（注解实体）时，启用Hibernate的二级缓存需要哪些步骤？我如何检查它是否有效？我正在使用 JBoss 4.2.2.GA。
From the Hibernate documentation, it seems that I need to enable the cache and specify a cache provider in persistence.xml, like:
从 Hibernate 文档来看，我似乎需要启用缓存并在persistence.xml 中指定一个缓存提供程序，例如：
<property name="hibernate.cache.use_second_level_cache"
value="true" />
<property name="hibernate.cache.provider_class"
value="org.hibernate.cache.HashtableCacheProvider" />
What else is required? Do I need to add @Cacheannotations to my JPA entities?
还需要什么？我需要在JPA 实体中添加@Cache注释吗？
How can I tell if the cache is working? I have tried accessing cache statistics after running a Query, but Statistics.getSecondLevelCacheStatisticsreturns null, perhaps because I don't know what 'region' name to use.
如何判断缓存是否正常工作？我尝试在运行查询后访问缓存统计信息，但Statistics.getSecondLevelCacheStatistics返回 null，可能是因为我不知道要使用什么“区域”名称。
采纳答案by Tim Howland
I believe you need to add the cache annotations to tell hibernate how to use the second-level cache (read-only, read-write, etc). This was the case in my app (using spring / traditional hibernate and ehcache, so your mileage may vary). Once the caches were indicated, I started seeing messages that they were in use from hibernate.
我相信您需要添加缓存注释来告诉 hibernate 如何使用二级缓存（只读、读写等）。我的应用程序就是这种情况（使用 spring / 传统的休眠和 ehcache，所以你的里程可能会有所不同）。一旦显示缓存，我就开始看到它们正在从休眠状态使用的消息。
回答by Peter Hilton
Follow-up: in the end, after adding annotations, I have it working with EhCache, i.e.
后续：最后，添加注释后，我让它与EhCache一起工作，即
<property name="hibernate.cache.provider_class"
value="net.sf.ehcache.hibernate.EhCacheProvider" />
