hibernate获取SessionFactory失败 咋办？
如题 代码：

package com.test.tree.client;

import org.hibernate.cfg.Configuration;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import com.test.pojo.Book;

public class HibernateTest
{
public static void main(String[] args)
{
Configuration cfg = new Configuration().configure();

SessionFactory factory = cfg.buildSessionFactory();

Session session = factory.openSession();;

session.beginTransaction();

Book book  = new Book();
book.setBook_name("轻量级JavaEE企业应用实战");
book.setBook_editor("李刚");
book.setBook_pub("电子工业出版社");
book.setBook_price((float) 99.00);

session.save(book);
session.getTransaction().commit();

}

}

错误代码：
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:169)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2833)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2829)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1840)
at com.test.tree.client.HibernateTest.main(HibernateTest.java:15)


为啥获取不到sessionfactory呢？
[解决办法]
很有可能跟你的JAR包有关，看一下
[解决办法]
很有可能是你的hibernate配置文件里面有错误
[解决办法]
Configuration cfg = new Configuration();
SessionFactory sf =cfg.configure().buildSessionFactory();

这样试试看