常见问题集

1、懒加载问题

 

session关闭后，再从数据库里面拿信息。

 

2、提交事务出错-->不能进行更新操作-->表或视图不存在

javax.persistence.RollbackException: Error while commiting the transaction

Caused by: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update

    ... 21 more   

Caused by: java.sql.BatchUpdateException: ORA-00942: table or view does not exist

    ... 36 more

 

3、一对多问题，找不到维护对象，即维护对象名弄错了或不存在

javax.persistence.PersistenceException: [PersistenceUnit: itcast] Unable to configure EntityManagerFactory

   Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: cn.itcast.bean.OrderItem.order in cn.itcast.bean.Orders.items

        ... 24 more