Java 如何在 Hibernate 4.3 中配置二级缓存
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How to configure second level cache in Hibernate 4.3
提问by Prashant Shilimkar
I have read post related with this but not get any answer working for me.
I am configuring second level cachein Hibernate v4.3.And I have used MySQL 5.0
我已阅读与此相关的帖子，但没有得到任何对我有用的答案。我配置second level cache的Hibernate v4.3.，我已经使用MySQL 5.0
I have written following elements in hibernate.cfg.xml
我写了以下元素 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>
I have annotated my Entity class for cache as follows
我已经为缓存注释了我的实体类，如下所示
@Entity
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
public class Employee { ....}
Following exception is shown when run
运行时显示以下异常
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
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
I have seen than there are different cache providers for Hibernate v3like EhCacheProvoider. All are in org.hibernate.cachepackage.
But for Hibernate 4.3there are only 3 classes as RegionFactory.classand other two are of exception.
我已经看到有不同的缓存提供程序Hibernate v3like EhCacheProvoider。全部都在org.hibernate.cache包装中。但是因为Hibernate 4.3只有 3 个类，RegionFactory.class而其他两个类是exception.
1. What is wrong with above code?
1. 上面的代码有什么问题？
2. What are major changes made for Second level cache configuration in Hibernate 4.3?
2. Hibernate 4.3 的二级缓存配置有哪些主要变化？
回答by namiya
I got the same problem before. I added slf4j-api-1.6.1.jar to the project and fixed this problem. I was using Hibernate 4.3.5.
我之前也遇到过同样的问题。我在项目中添加了 slf4j-api-1.6.1.jar 并解决了这个问题。我使用的是 Hibernate 4.3.5。
回答by cmorris
I solved this for my configuration. Viewing the "effective pom" for my project had shown:
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>
along with most of my other dependencies.
以及我的大多数其他依赖项。
Copying that hibernate-ehcache dependency into my actual project pom file added a second entry for it outside of the <dependencyManagement/>tag and that solved my problem. I had thought that because it was already included in the effective pom I didn't need to add it but apparently that is not the case for hibernate-ehcache as it seems to be for other packages.
将 hibernate-ehcache 依赖项复制到我的实际项目 pom 文件中，在<dependencyManagement/>标签之外为其添加了第二个条目，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 并非如此，因为它似乎适用于其他软件包。
回答by Surabhi Mutha
Refer this - http://architects.dzone.com/articles/hibernate-4-and-ehcache-higher
参考这个 - http://architects.dzone.com/articles/hibernate-4-and-ehcache-higher
add hibernate-ehcache jar to your project, that will solve the problem.
将 hibernate-ehcache jar 添加到您的项目中，这将解决问题。
回答by Swapnil
Your pom.xml file should look like below
您的 pom.xml 文件应如下所示
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>4.3.7.Final</version>
<exclusions>
<exclusion>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.7.1</version>
</dependency>
and Your hibernate.cfg.xml should contain the following configuration
并且您的 hibernate.cfg.xml 应包含以下配置
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
