How to use

findNamedEntityManagerFactory

method

in

org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor

/**
 * Find an EntityManagerFactory with the given name in the current Spring
 * application context, falling back to a single default EntityManagerFactory
 * (if any) in case of no unit name specified.
 * @param unitName the name of the persistence unit (may be {@code null} or empty)
 * @param requestingBeanName the name of the requesting bean
 * @return the EntityManagerFactory
 * @throws NoSuchBeanDefinitionException if there is no such EntityManagerFactory in the context
 */
protected EntityManagerFactory findEntityManagerFactory(@Nullable String unitName, @Nullable String requestingBeanName)
    throws NoSuchBeanDefinitionException {
  String unitNameForLookup = (unitName != null ? unitName : "");
  if (unitNameForLookup.isEmpty()) {
    unitNameForLookup = this.defaultPersistenceUnitName;
  }
  if (!unitNameForLookup.isEmpty()) {
    return findNamedEntityManagerFactory(unitNameForLookup, requestingBeanName);
  }
  else {
    return findDefaultEntityManagerFactory(requestingBeanName);
  }
}

/**
 * Find an EntityManagerFactory with the given name in the current Spring
 * application context, falling back to a single default EntityManagerFactory
 * (if any) in case of no unit name specified.
 * @param unitName the name of the persistence unit (may be {@code null} or empty)
 * @param requestingBeanName the name of the requesting bean
 * @return the EntityManagerFactory
 * @throws NoSuchBeanDefinitionException if there is no such EntityManagerFactory in the context
 */
protected EntityManagerFactory findEntityManagerFactory(@Nullable String unitName, @Nullable String requestingBeanName)
    throws NoSuchBeanDefinitionException {
  String unitNameForLookup = (unitName != null ? unitName : "");
  if (unitNameForLookup.isEmpty()) {
    unitNameForLookup = this.defaultPersistenceUnitName;
  }
  if (!unitNameForLookup.isEmpty()) {
    return findNamedEntityManagerFactory(unitNameForLookup, requestingBeanName);
  }
  else {
    return findDefaultEntityManagerFactory(requestingBeanName);
  }
}

/**
 * Find an EntityManagerFactory with the given name in the current Spring
 * application context, falling back to a single default EntityManagerFactory
 * (if any) in case of no unit name specified.
 * @param unitName the name of the persistence unit (may be {@code null} or empty)
 * @param requestingBeanName the name of the requesting bean
 * @return the EntityManagerFactory
 * @throws NoSuchBeanDefinitionException if there is no such EntityManagerFactory in the context
 */
protected EntityManagerFactory findEntityManagerFactory(@Nullable String unitName, @Nullable String requestingBeanName)
    throws NoSuchBeanDefinitionException {
  String unitNameForLookup = (unitName != null ? unitName : "");
  if (unitNameForLookup.isEmpty()) {
    unitNameForLookup = this.defaultPersistenceUnitName;
  }
  if (!unitNameForLookup.isEmpty()) {
    return findNamedEntityManagerFactory(unitNameForLookup, requestingBeanName);
  }
  else {
    return findDefaultEntityManagerFactory(requestingBeanName);
  }
}