Merging persistence units
Spring supports having multiple persistence units. Sometimes, however, you might want to modularize your application but still make sure that all these modules run inside a single persistence unit. To enable that behavior, Spring Data JPA offers a PersistenceUnitManager implementation that automatically merges persistence units based on their name, as shown in the following example:
<bean class="….LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitManager">
<bean class="….MergingPersistenceUnitManager" />
</property>
</bean>Classpath Scanning for @Entity Classes and JPA Mapping Files
A plain JPA setup requires all annotation-mapped entity classes to be listed in orm.xml. The same applies to XML mapping files. Spring Data JPA provides a ClasspathScanningPersistenceUnitPostProcessor that gets a base package configured and optionally takes a mapping filename pattern. It then scans the given package for classes annotated with @Entity or @MappedSuperclass, loads the configuration files that match the filename pattern, and hands them to the JPA configuration. The post-processor must be configured as follows:
<bean class="….LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitPostProcessors">
<list>
<bean class="org.springframework.data.jpa.support.ClasspathScanningPersistenceUnitPostProcessor">
<constructor-arg value="com.acme.domain" />
<property name="mappingFileNamePattern" value="**/*Mapping.xml" />
</bean>
</list>
</property>
</bean>
As of Spring 3.1, a package to scan can be configured on the LocalContainerEntityManagerFactoryBean directly to enable classpath scanning for entity classes. See the JavaDoc for details.
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