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JPA + Jboss Second Level Cache

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hoba_fci

Post subject: JPA + Jboss Second Level Cache

Posted: Wed Jan 20, 2010 2:45 am

Newbie

Joined: Mon Jan 11, 2010 9:46 am
Posts: 2

i'm facing a problem while i's trying to configure JPA second level cache with JBoss cache

i'm using hibernate 3.2.5.ga and Jboss cache 1.4.1
persistence.xml

Code:

<persistence-unit name="JPAJbossCachePU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>model.Item</class>
    <shared-cache-mode>ALL</shared-cache-mode>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
      <property name="hibernate.connection.username" value="root"/>
      <property name="hibernate.connection.password" value="admin"/>
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/ehabt"/>
      <property name="hibernate.show_sql" value="true"/>
      <property name="hibernate.generate_statistics" value="true"/>
      <property name="hibernate.cache.use_second_level_cache" value="true"/>
      <property name="hibernate.cache.use_query_cache" value="true"/>


      <property name="cache.provider_class" value="org.hibernate.cache.OptimisticTreeCacheProvider"/>
      <property name="transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTSTransactionManagerLookup"/>
      <property name="net.sf.ehcache.configurationResourceName" value="jboss-cache.xml"/>

    </properties>
  </persistence-unit>

the error

Code:

[color=#FF0000]Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: JPAJbossCachePU] Unable to build EntityManagerFactory
        at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
        at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
        at client.Main.main(Main.java:25)
Caused by: org.hibernate.HibernateException: Could not instantiate cache implementation
        at org.hibernate.cache.CacheFactory.createCache(CacheFactory.java:64)
        at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:214)
        at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
        at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)
        at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
        ... 4 more
Caused by: org.hibernate.cache.NoCachingEnabledException: Second-level cache is not enabled for usage [hibernate.cache.use_second_level_cache | hibernate.cache.use_query_cache]
        at org.hibernate.cache.NoCacheProvider.buildCache(NoCacheProvider.java:21)
        at org.hibernate.cache.CacheFactory.createCache(CacheFactory.java:61)
        ... 8 more
Java Result: 1[/color]

but if i replaced the Jboss cache with ehcache every thing works fine

Code:

<property name="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/>
      <property name="net.sf.ehcache.configurationResourceName" value="ehcache.xml"/>

      <!--
      <property name="cache.provider_class" value="org.hibernate.cache.OptimisticTreeCacheProvider"/>
      <property name="transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTSTransactionManagerLookup"/>
      <property name="net.sf.ehcache.configurationResourceName" value="jboss-cache.xml"/>

and these configuration works fine with me in a simple hibernate application so why it doesn't work in JPA?

thank's in advance

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pb00067

Post subject: Re: JPA + Jboss Second Level Cache

Posted: Wed Jan 20, 2010 4:27 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

1. Why not try to use the latest official releases, such as Hiberante 3.3.2 GA and JBossCache 3.2.1.GA ?

2. Beside the problem you mention, there's another thing to consider:
In your example you are using transaction-type="RESOURCE_LOCAL", but with JBossCache you need "JTA"
JBoss Cache used as 2Lcache implementation for Hiberante requires integration with a JTA in order to meet the requirements of the second level caching use case. Please see
http://www.jboss.org/file-access/default/members/jbossclustering/freezone/docs/hibernate-caching/3.3/en-US/html/introduction-requirements.html
section 1.2.2

Why is JTA required in this environment?
Without JTA integration it easily will happen that 2LC remains in an inconsistent state:
Here's a concrete example:

1. load an existent instance from db and modify it
2. flush
3. rollback

After flushing, without JTA-integration the 2L cache returns the cached instance in it's modified state, although it was never commited! This even in further transactions and other sessions, until the instance is evicted from 2L cache!

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