我已阅读与此相关的帖子，但没有得到任何适合我的答案。 我正在配置 second level cache在 Hibernate v4.3.我用过MySQL 5.0

我在 hibernate.cfg.xml 中写了以下元素

<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>

我已经为我的缓存实体类注释如下

@Entity 

@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
public class Employee { ....}

运行时出现如下异常

INFO: HHH000397: Using ASTQueryTranslatorFactory
Exception in thread "main" org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.cache.spi.RegionFactory]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:233)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:197)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:295)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2442)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2438)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1855)
    at com.example.hibernate.Hibernate4Main.main(Hibernate4Main.java:32)
Caused by: org.hibernate.HibernateException: could not instantiate RegionFactory [org.hibernate.cache.ehcache.EhCacheRegionFactory]
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:101)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:46)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:83)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:223)
    ... 7 more
Caused by: org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable to resolve name [org.hibernate.cache.ehcache.EhCacheRegionFactory] as strategy [org.hibernate.cache.spi.RegionFactory]
    at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:128)
    at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:87)
    ... 10 more

我见过 Hibernate v3 有不同的缓存提供程序喜欢EhCacheProvoider .都在org.hibernate.cache包裹。 但是对于 Hibernate 4.3只有 3 个类 RegionFactory.class和其他两个是exception .

<强>1。上面的代码有什么问题？

<强>2。 Hibernate 4.3 中二级缓存配置有哪些重大变化？

最佳答案

我为我的配置解决了这个问题。查看我的项目的“有效 pom”显示:

<dependencyManagement>
  <dependencies>        
    ...
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-ehcache</artifactId>
      <version>4.3.7.Final</version>
    </dependency>
    ...
  </dependencies>
</dependencyManagement>

以及我的大部分其他依赖项。

将 hibernate-ehcache 依赖项复制到我的实际项目 pom 文件中，在 <dependencyManagement/> 之外为其添加了第二个条目标签，这解决了我的问题。我原以为因为它已经包含在有效的 pom 中，所以我不需要添加它，但显然 hibernate-ehcache 不是这种情况，因为它似乎是其他包的情况。

关于java - Hibernate 4.3如何配置二级缓存，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20719590/