LocalEntityManagerFactoryBean.java 文件源码

/**
 * Initialize the EntityManagerFactory for the given configuration.
 * @throws javax.persistence.PersistenceException in case of JPA initialization errors
 */
@Override
protected EntityManagerFactory createNativeEntityManagerFactory() throws PersistenceException {
    if (logger.isInfoEnabled()) {
        logger.info("Building JPA EntityManagerFactory for persistence unit '" + getPersistenceUnitName() + "'");
    }
    PersistenceProvider provider = getPersistenceProvider();
    if (provider != null) {
        // Create EntityManagerFactory directly through PersistenceProvider.
        EntityManagerFactory emf = provider.createEntityManagerFactory(getPersistenceUnitName(), getJpaPropertyMap());
        if (emf == null) {
            throw new IllegalStateException(
                    "PersistenceProvider [" + provider + "] did not return an EntityManagerFactory for name '" +
                    getPersistenceUnitName() + "'");
        }
        return emf;
    }
    else {
        // Let JPA perform its standard PersistenceProvider autodetection.
        return Persistence.createEntityManagerFactory(getPersistenceUnitName(), getJpaPropertyMap());
    }
}