Hibernate使用out pers.xml创建JPA EntityManagerFactory

Question

您有没有人知道在Hibernate 4 +中以编程方式从Hibernate创建JPA EntityManagerFactory impl的首选方法是什么？

我使用hsql执行此操作，但是已将其删除;

Properties props = new Properties();
props.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLInnoDBDialect");
props.setProperty("hibernate.connection.driver_class", "org.hsqldb.jdbcDriver"); 
props.setProperty("hibernate.connection.url", "jdbc:hsqldb:mem:aname");
props.setProperty("hibernate.connection.username", "sa" );  
props.setProperty("hibernate.connection.password", "" );        

Ejb3Configuration config3 = new Ejb3Configuration();
config3.setProperties(props);
config3.addFile("src/org/adligo/i/storage/entities/keyValue.xml");
impl = config3.buildEntityManagerFactory();

这似乎是新的方式，但我一直在接受NPE;

impl = new EntityManagerFactoryImpl(transactionType, false, 
                    clazz, config, serviceRegistry, "i_storage_tests_persistence_unit");

TIA， 斯科特