问答详情
源自：1-11 通过Hibernate API编写访问数据库的代码

hibernate创建session报空指针异常版本 hibernate5.1.0 jboss4.3

package com.imooc.entity;




import java.util.Date;


import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.cfg.Configuration;

import org.hibernate.service.ServiceRegistry;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

public class StudentsTest {

private SessionFactory sessionFactory;

private Session session;

private Transaction transaction;

@Test

public void testSaveStudents() {

Students s = new Students();//创建学生对象

s.setSid(1);

s.setSname("张三丰");

s.setGender("男");

s.setBirthday(new Date());

s.setAddress("武当山");

session.save(s);//将学生对象写入数据库

}

@Before

public void init(){

//创建配置对象并读取classpath下的配置文件hibernate.cfg.xml

Configuration config = new Configuration();

//创建serviceRegistry对象,hibernate中的任何配置和服务都必须在此对象中注册

StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(config.getProperties());

ServiceRegistry serviceRegistry = ssrb.build();

//创建会话工厂对象

sessionFactory = config.configure().buildSessionFactory(serviceRegistry);

//开启会话对象

session = sessionFactory.openSession();

//开启事务

transaction = session.beginTransaction();

}

@After

public void destroy(){

if(transaction!=null){

transaction.commit();//提交事务

if(session!=null){

session.close();//关闭会话

if(sessionFactory!=null){

sessionFactory.close();//关闭会话工厂

}

}

}

}

}


提问者：慕哥7786388 2016-03-01 15:45

个回答

  • 如果我是DJ我是DJ我是DJ我是DJ
    2018-08-06 20:29:25

    我的问题是没有通过spring 的bean 直接调用了dao层的实体类 所以空指针

    0
  • doramoon
    2016-03-28 17:21:52

    package hibernate_test1;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class HibernateTest {

	private SessionFactory sessionFactory;
	private Session session;
	private Transaction transaction;

	@Before
	public void init() {
		// 创建配置对象
		Configuration configuration = new Configuration().configure();
		// 创建服务注册对象
		ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties())
				.buildServiceRegistry();
		//创建会话工厂对象
		sessionFactory = configuration.buildSessionFactory(serviceRegistry);
		//创建会话对象
		session = sessionFactory.openSession();
		//开启事务
		transaction = session.beginTransaction();
	}

	@Test
	public void test() {
		User user = new User("A1","张三",20,new Date());
		session.save(user);
	}

	@After
	public void destroy() {
		//提交事务
		transaction.commit();
		//关闭资源
		session.close();
		sessionFactory.close();
	}

}


    0
  • 梁XX
    2016-03-10 22:33:33

    @Before
public void init(){

//创建配置对象并读取classpath下的配置文件hibernate.cfg.xml
Configuration config = new Configuration();
//创建serviceRegistry对象,hibernate中的任何配置和服务都必须在此对象中注册
StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(config.getProperties());

//这里这里看这里！！
ServiceRegistry serviceRegistry = ssrb.buildServiceRegistry();


    0
  • Z0R0
    2016-03-02 14:44:08

    注册对象不对，应该用buildServiceRegistery()方法,而不是用build()方法

    0