code: public Map<String, Object> determineHibernateProperties(
  			Map<String, String> jpaProperties, HibernateSettings settings) {
  		Assert.notNull(jpaProperties, "JpaProperties must not be null");
  		Assert.notNull(settings, "Settings must not be null");
  		return getAdditionalProperties(jpaProperties, settings);
  	}
docs: Determine the configuration properties for the initialization of the main Hibernate
  EntityManagerFactory based on standard JPA properties and
  {@link HibernateSettings}.
  @param jpaProperties standard JPA properties
  @param settings the settings to apply when determining the configuration properties
  @return the Hibernate properties to use