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Integrating BTM with Hibernate

Hibernate can be integrated straight with any JTA transaction manager.

The biggest added value (omitting the fact that you can use Hibernate and two databases) is Hibernate's Current Session context management. You do not have to take care about opening nor closing Session as Hibernate will automatically bind them to the JTA transaction's lifecycle. You just have to make sure JTA transactions are properly started and ended.

JTA datasources

Hibernate cannot directly create a BTM PoolingDataSource. You will have to create them yourself (either via the API or the Resource Loader) then bind them to a JNDI server.

Creating the datasources

As you can expect, you will need to create one PoolingDataSource per database.

Binding the datasources to JNDI

You have to bind the datasources to some JNDI server. You can use any one you wish, including the one embedded in your application server.

In the case you want to run Hibernate in a standalone application, you can use Tomcat's JNDI server as it is very easy to use it in a standalone J2SE application.

Just create a jndi.properties file at the root of your classpath. It should only contain this line:

Then add these two jar files to your classpath:

They come from Tomcat 5.5.23 distribution, look into the TOMCAT_HOME/common/lib folder.

Finally, here is the code to bind the datasources:

Hibernate Session factories

You need to configure exactly one SessionFactory per datasource.

You have to tell Hibernate where to get the BTM datasource via JNDI.

You have to set current_session_context_class to jta. (see http://www.hibernate.org/hib_docs/reference/en/html/session-configuration.html#configuration-misc-properties)

You have to set transaction.factory_class to org.hibernate.transaction.JTATransactionFactory (see http://www.hibernate.org/hib_docs/reference/en/html/session-configuration.html#configuration-transaction-properties)

You have to set transaction.manager_lookup_class to an implementation of TransactionManagerLookup that you have to create yourself. Here is an example implementation if this interface:

Here is what the hibernate.cfg.xml file will look like:

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