public static Session currentSession()throws HibernateException{
             Session session=(Session)threadLocal.get();
              if(session==null){
                  
                  if(sessionFactory==null){
                      try{
                      cfg.configure(CONFIG_FILE_LOCATION);
                      sessionFactory=cfg.configure().buildSessionFactory();
                      }catch(Exception e){
                      System.err.println("%%%% Error Creating SessionFatory %%%%");
                  }
                      }
                  session=sessionFactory.openSession();//提示这里出错，mian函数报空指针异常，不知道怎么办，程序检查正确，但一运行就出错。
                  threadLocal.set(session);
              }
              return session;
          }

            

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE Hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate. <session-factory>
        <property name="myeclipse.connection.profile">JDBC for MySQL</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/demo</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <mapping resource="com/demo/hibernate/beans/po/User.hbm.xml" /></session-factory></Hibernate-configuration>

这是hibernate.cfg.xml

//HibernateSessionfactory代码

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateSessionFactory {
          private static String CONFIG_FILE_LOCATION="/hibernate.cfg.xml";
          private static final ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();
          private static final Configuration cfg=new Configuration();
          private static SessionFactory sessionFactory;
          
          public static Session currentSession()throws HibernateException{
             Session session=(Session)threadLocal.get();
              if(session==null){
                  
                  if(sessionFactory==null){
                      try{
                      cfg.configure(CONFIG_FILE_LOCATION);
                      sessionFactory=cfg.configure().buildSessionFactory();
                      }catch(Exception e){
                      System.err.println("%%%% Error Creating SessionFatory %%%%");
                  }
                      }
                  session=sessionFactory.openSession();
                  threadLocal.set(session);
              }
              return session;
          }
          
          public static void closeSession(){
              Session session=(Session)threadLocal.get();
              threadLocal.set(null);
              if(session!=null){
                  session.close();
              }
          }
}

//User.hbm.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE Hibernate-maping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate. package="com.demo.hibernate.beans.po">
    <class name="User" table="user">
        <id name="id" column="id" type="integer">
            <generator class="native"></generator>
        </id>
        <property name="username" column="username" type="string"></property>
        <property name="password" column="password" type="string"></property>
        <property name="email" column="email" type="string"></property></class></Hibernate-maping>

请大神给指点一下。初学hibernate。

还是不行啊

谢谢回帖，但即使复制粘贴过去，即使还是有些异常。