Hibernate Persistence

In Hibernate we can create a file under META-INF called persistence.xml, to define settings and persistence entities.

Sample persistence.xml file:

<persistence>
	<persistence-unit name="CosmicLearn">
		<jta-data-source>CosmicDB</jta-data-source>
	</persistence-unit>

	<class>com.cosmiclearn.model.Planet</class>
	<class>com.cosmiclearn.model.Galaxy</class>

</persistence>

We need to define atleast one persistence unit. Here we created a persistence unit named CosmicLearn.

<persistence-unit name="CosmicLearn">

We need to define a data source for our project to connect to. We can do that by providing a JNDI data source as shown below.

<jta-data-source>CosmicDB</jta-data-source>

We can list our mapped classes for the domain as shown below. Hibernate will read these classes and use them as persistent entities.

<class>com.cosmiclearn.model.Planet</class>
<class>com.cosmiclearn.model.Galaxy</class>