Hiberante中的SessionFactory代码未执行/继续

Question

以下是我的java课程。我正在使用Hibernate 5.2.11和jdk1.8。即使我尝试过其他5.2.x版本，但我的程序仍然只是从第一行代码中退出（在课堂上提到）。

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

public class HibernateCfg {

// private static final Logger logger =
// LogManager.getLogger(HibernateCfg.class.getName());

private static HibernateCfg hc = null;
private static final Object object = new Object();
private SessionFactory sessionFactory;
private StandardServiceRegistry registry;
private Session session;

private HibernateCfg() {

    sessionFactory = getSessionFactory();
    // Create registry

}

private SessionFactory getSessionFactory() {

    try {
//code stops here at below line
        StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
                .configure("/hibernate.cfg.xml").build();
        Metadata metadata = new MetadataSources(standardRegistry).getMetadataBuilder().build();
        sessionFactory = metadata.getSessionFactoryBuilder().build();
        return sessionFactory;
    } catch (Exception e) {

    }
    return null;

}

public static HibernateCfg getObject() {
    if (hc == null) {
        synchronized (object) {
            if (hc == null) {
                hc = new HibernateCfg();
            }
        }

    }
    return hc;
}

什么似乎是问题？