hibernate保存对象的一点问题，搞得我好郁闷啊

Question

测试代码如下：
                session.getTransaction().begin();

  Address address=(Address)session.load(Address.class, 1);;
         Userinfo userinfo=new Userinfo();
userinfo.setAddress(address);
userinfo.setUser(user);
        session.getTransaction().commit();

Answer 1

测试代码应该这样，刚才弄错了： 
         session.getTransaction().begin(); 
        Address address=(Address)session.load(Address.class, 1);; 
        Userinfo userinfo=new Userinfo(); 
        userinfo.setAddress(address); 
session.save(userinfo);
        session.getTransaction().commit();

Answer 2

异常如下
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:202)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:139)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at com.test.Client.main(Client.java:77)
Caused by: java.sql.BatchUpdateException: Duplicate key or integrity constraint violation message from server: "Cannot add or update a child row: a foreign key constraint fails (`cityu`.`userinfo`, CONSTRAINT `FKF02772F95CA635D4` FOREIGN KEY (`addressid`) REFERENCES `address` (`id`))"
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1540)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)
... 8 more