JPA + The Fish + Spring

In the app context
<context:annotation-config />
<tx:jta-transaction-manager />
<tx:annotation-driven transaction-manager="transactionManager" />
<jee:jndi-lookup id="entityManagerFactory" jndi-name="persistence/myPU"/>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>

In the web.xml

<persistence-unit-ref>
<persistence-unit-ref-name>persistence/myPU</persistence-unit-ref-name>
<persistence-unit-name>myPU</persistence-unit-name>
</persistence-unit-ref>

In the persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="myPU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>jdbc/myDatasource</jta-data-source>
<properties>
<property name="hibernate.bytecode.provider" value="cglib"/>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
</persistence>

Then to access in code:

@PersistenceContext
private EntityManager entityManager;