myeclipse hibernate多对多时候 关系表不能加入数据

测试类：public static void main(String[] args) {
Configuration conf = new Configuration().configure();//1、读取配置文件
SessionFactory sf = conf.buildSessionFactory();// 2、创建SessionFactory
Session session = sf.openSession();// 3、打开Session
Transaction tx = null;
try{
tx = session.beginTransaction();// 4、开始一个事务
// 5、持久化操作
Work w1=new Work();
w1.setWorkKind("jingli");
session.save(w1);

Work w2=new Work();
w2.setWorkKind("xiaoshou");
session.save(w2);

Work w3=new Work();
w3.setWorkKind("houqin");
session.save(w3);

People p1=new People();
p1.setName("songqi");
Set s1=new HashSet();
s1.add(w1);
s1.add(w2);
s1.add(w3);
p1.setWorks(s1);

People p2=new People();
p2.setName("yangdong");
Set s2=

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