How to configure Spring without persistence.xml?

Question

I\'m trying to set up spring xml configuration without having to create a futher persistence.xml. But I\'m constantly getting the following exception, even thou

Answer 1

Assuming that you have a PersistenceProvider implementation (e.g. org.hibernate.jpa.HibernatePersistenceProvider), you can use the PersistenceProvider#createContainerEntityManagerFactory(PersistenceUnitInfo info, Map map) method to bootstrap an EntityManagerFactory without needing a persistence.xml.

However, it's annoying that you have to implement the PersistenceUnitInfo interface, so you are better off using Spring or Hibernate which both support bootstrapping JPA without a persistence.xml file:

this.nativeEntityManagerFactory = provider.createContainerEntityManagerFactory(
    this.persistenceUnitInfo, 
    getJpaPropertyMap()
);

Where the PersistenceUnitInfo is implemented by the Spring-specific MutablePersistenceUnitInfo class.

Check out this article for a nice demonstration of how you can achieve this goal with Hibernate.