Atomikos Forum

I spent quite a bit of time struggling with getting Atomikos to integrate with Hibernate as a JPA provider in a simple environment, such as tomcat.  Since there are a few posts that deal with this issue and none that I saw provide a complete solution, I figured I would let people know how I got it working.  I am by no means an expert, so there could definitely be some problems with what I've done (let me know if there are), but it appears to be working well.

Much of what I did is actually based on this post:
http://it-essence.xs4all.nl/roller/technology/entry/transactions_over_multiple_jpa_persistence

Persistence Unit from persistence.xml:
<persistence-unit name="jta" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9iDialect" />
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
<property name="hibernate.transaction.manager_lookup_class" value="com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup" />
</properties>
</persistence-unit>

Applicable bean definitions of applicationContext.xml
<bean id="xaDataSource"class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close">
<qualifier value="atomikosDataSource" />
<property name="uniqueResourceName" value="xaDataSource" />
<property name="xaDataSourceClassName" value="${database.datasource.class}" />
<property name="xaProperties">
<props>
<prop key="URL">${database.url}</prop>
<prop key="user">${database.username}</prop>
<prop key="password">${database.password}</prop>
</props>
</property>
<property name="poolSize" value="20" />
</bean>

<bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="jtaEntityManagerFactory">
<property name="dataSource" ref="xaDataSource" />
<property name="persistenceUnitName" value="jta" />
</bean>

<tx:annotation-driven mode="aspectj" />

<bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="transactionManager" ref="atomikosTransactionManager" />
<property name="userTransaction" ref="atomikosUserTransaction" />
<qualifier value="jta" />
</bean>

<bean id="userTransactionService" class="com.atomikos.icatch.config.UserTransactionServiceImp" init-method="init" destroy-method="shutdownForce" />

<bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" depends-on="userTransactionService" />

<bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp" depends-on="userTransactionService">
<property name="transactionTimeout" value="300" />
</bean>

I also got a JMS resource in the mix, and if I turn up spring/atomikos logging I can see transactions committing/rolling back appropriately.

Thanks very much, John!

What version(s) of each product did you use?

Thanks

Hibernate: 3.5.0-Final
Spring: 3.0.2.RELEASE
Atomikos: 3.6.4

Thanks again,

This was one of the main complaints we had so far - lack of JPA samples. I am sure this will make good stuff for our wiki and docs!

Cheers