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为什么我调试的代码出错提示 Session session = MyHibernateSessionFactory.getSessionFactory().getCurrentSession();出错

package db;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class MyHibernateSessionFactory {
/**
* 会话工厂属性
*/
private static SessionFactory sessionFactory;
/**
* 构造方法私有化,保证单例模式
*/
private MyHibernateSessionFactory(){

}

/**
* 公有的方法,获取会话工厂对象
* @author huangguoce
* @return sessionFactory
*/
public static SessionFactory getSessionFactory(){
if (sessionFactory == null) {
Configuration configuration = new Configuration().configure();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
.applySettings(configuration.getProperties())
.buildServiceRegistry();
sessionFactory =configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
}else {
return sessionFactory;
}
}
}

package service;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import db.MyHibernateSessionFactory;
import entity.User;

public class UserDaoImpl implements UserDao{

@Override
public boolean userLogin(User user) {
/**
* 事务对象
*/
Transaction tx = null;
String sql = "";

try {
Session session = MyHibernateSessionFactory.getSessionFactory().getCurrentSession();
//开启事务
tx = session.beginTransaction();
sql = "from user where username=? and password=?";
Query query = session.createQuery(sql);
query.setParameter(0, user.getUsername());
query.setParameter(1, user.getPassword());
List userList = query.list();
System.out.println(userList.toString());
tx.commit();
if (userList.size()>0) {
return true;
}else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}finally{
if (tx != null) {
tx = null;
}
}
}

}

五月 09, 2016 8:39:13 下午 org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.2.Final}

五月 09, 2016 8:39:13 下午 org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.2.2.Final}

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Configuration configure

INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Configuration getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Configuration addResource

INFO: HHH000221: Reading mappings from resource: entity/Student.hbm.xml

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Configuration addResource

INFO: HHH000221: Reading mappings from resource: entity/User.hbm.xml

五月 09, 2016 8:39:13 下午 org.hibernate.cfg.Configuration doConfigure

INFO: HHH000041: Configured SessionFactory: null

五月 09, 2016 8:39:13 下午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)

五月 09, 2016 8:39:13 下午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000115: Hibernate connection pool size: 20

五月 09, 2016 8:39:13 下午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000006: Autocommit mode: false

五月 09, 2016 8:39:13 下午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql:///test]

五月 09, 2016 8:39:13 下午 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000046: Connection properties: {user=root, password=****}

五月 09, 2016 8:39:13 下午 org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect

五月 09, 2016 8:39:14 下午 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService

INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)

五月 09, 2016 8:39:14 下午 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>

INFO: HHH000397: Using ASTQueryTranslatorFactory

五月 09, 2016 8:39:14 下午 org.hibernate.tuple.PojoInstantiator <init>

INFO: HHH000182: No default (no-argument) constructor for class: entity.Student (class must be instantiated by Interceptor)

五月 09, 2016 8:39:14 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000228: Running hbm2ddl schema update

五月 09, 2016 8:39:14 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000102: Fetching database metadata

五月 09, 2016 8:39:14 下午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000396: Updating schema