How to configure second level cache in Hibernate 4.3

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

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 2

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 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.