Create an EntityManager programatically in JPA1

JPAUtils.java

/**
 * @return an in-memory HSQL entityManager
 * @author Timoteo Ponce
 */
public static EntityManager createEntityManager() {
	Properties properties = new Properties();
	properties.put("javax.persistence.provider", "org.hibernate.ejb.HibernatePersistence");
	properties.put("javax.persistence.transactionType", "RESOURCE_LOCAL");
	properties.put("hibernate.connection.username", "sa");
	properties.put("hibernate.connection.password" ,"");
	properties.put("hibernate.connection.driver_class","org.hsqldb.jdbcDriver");			
	properties.put("hibernate.connection.url", "jdbc:hsqldb:." );
	properties.put("hibernate.dialect" ,"org.hibernate.dialect.HSQLDialect");
	properties.put("hibernate.hbm2ddl.auto","create-drop");
	properties.put("hibernate.show_sql","true");
	properties.put("hibernate.format_sql" ,"true");	
	//
	Ejb3Configuration cfg = new Ejb3Configuration();
	cfg.addProperties(properties);
	cfg.addAnnotatedClass(City.class);
	cfg.addAnnotatedClass(LocalCustomer.class);
	//
	EntityManagerFactory factory = cfg.buildEntityManagerFactory();
	return factory.createEntityManager();
}