如何在Hibernate 4.3中配置二级缓存

Question

I have read post related with this but not get any answer working for me. I am configuring second level cache in Hibernate v4.3. And I have used MySQL 5.0

I have written following elements in 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

@Entity 

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

Following exception is shown when run

 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 v3 like EhCacheProvoider . All are in org.hibernate.cache package. But for Hibernate 4.3 there are only 3 classes as RegionFactory.class and other two are of exception .

1. What is wrong with above code?

2. What are major changes made for Second level cache configuration in Hibernate 4.3?

Answer 1

I solved this for my configuration. Viewing the "effective pom" for my project had shown:

<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.

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.

Answer 2

Your pom.xml file should look like below

        <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

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

Answer 3

Refer this - http://architects.dzone.com/articles/hibernate-4-and-ehcache-higher

add hibernate-ehcache jar to your project, that will solve the problem.

Answer 4

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.