Bulk Data Loading with Hibernate

The most efficient way of loading large amounts of data into Hibernate is using a StatelessSession (provided of course you don't want to keep the objects being loaded in the Persistent Context). The StatelessSession essentially works like a plain JDBC connection with the added bonus of being able to use your mapped persistent classes. You should be able to copy/paste the following into your code:

public void bulkCreate(Collection<?> entities) {
  // Open a Stateless Session (this doesn't have a persistence context cache and
  // doesn't interact with any other second-level or query cache).  Everything
  // executed with a Stateless session results in an immediate SQL operation.
  StatelessSession session = HibernateUtil.getSessionFactory().openStatelessSession();
  session.beginTransaction();
  Iterator<?> it = entities.iterator();
  while (it.hasNext()) {
    session.insert(it.next());
  }
  session.getTransaction().commit();
  session.close();
}