如何在Hibernate 4.3中配置二级缓存

Question

我已阅读与此相关的帖子,但没有得到任何答案为我工作.我配置second level cache的Hibernate v4.3.,我已经使用MySQL 5.0

我写过以下内容 hibernate.cfg.xml

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

我已经为缓存注释了我的Entity类,如下所示

@Entity 

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

运行时会显示以下异常

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

我见过比有不同的缓存提供了Hibernate v3像EhCacheProvoider.一切都在org.hibernate.cache包装中.但因为Hibernate 4.3只有3个类,RegionFactory.class而其他两个类exception.

1.上述代码有什么问题？

2. Hibernate 4.3中二级缓存配置的主要变化是什么？

Answer 1

我为我的配置解决了这个问题.查看我项目的"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>

以及我的大多数其他依赖项.

将hibernate-ehcache依赖项复制到我的实际项目pom文件中,在<dependencyManagement/>标记之外添加了第二个条目,这解决了我的问题.我曾经想过,因为它已经包含在有效的pom中,我不需要添加它,但显然不是hibernate-ehcache的情况,因为它似乎适用于其他包.

Answer 2

我之前也遇到过同样的问题。我将 slf4j-api-1.6.1.jar 添加到项目中并修复了此问题。我使用的是 Hibernate 4.3.5。