在JBoss 4.2上使用JPA启用Hibernate二级缓存 [英] Enabling Hibernate second-level cache with JPA on JBoss 4.2

问题描述

在使用Java持久性API（注释实体）时，启用Hibernate的二级缓存所需的步骤是什么？我如何检查它的工作？我使用JBoss 4.2.2.GA。

从Hibernate文档看来，我需要启用缓存并在持久性中指定缓存提供程序.xml ，如：

 < property name =hibernate.cache.use_second_level_cache
 value =true/> 
< property name =hibernate.cache.provider_class
 value =org.hibernate.cache.HashtableCacheProvider/> 
  

还需要什么？我需要将 @Cache 注释添加到我的JPA实体吗？

如何判断缓存是否正常工作？我曾尝试在运行查询后访问缓存统计信息，但是 Statistics.getSecondLevelCacheStatistics 返回null，可能是因为我不知道要使用哪个'region'名称。

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.

From the Hibernate documentation, it seems that I need to enable the cache and specify a cache provider in persistence.xml, like:

<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 @Cache annotations to my JPA entities?

How can I tell if the cache is working? I have tried accessing cache statistics after running a Query, but Statistics.getSecondLevelCacheStatistics returns null, perhaps because I don't know what 'region' name to use.

解决方案

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.

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