How to retrieve the datasource used by a persistence unit programmatically

Question

...without actually reading and parsing the persistence.xml

I can retrieve the name of the persistence unit of an EntityManager using the p

Answer 1

In a Spring environment you can use this:

import org.springframework.orm.jpa.EntityManagerFactoryInfo;
...

@PersistenceContext
EntityManager entityManager;

public DataSource getDataSourceFromHibernateEntityManager() {
   EntityManagerFactoryInfo info = (EntityManagerFactoryInfo) entityManager.getEntityManagerFactory();
   return info.getDataSource();
}