Question

hibernate一对多、多对一关系（注解）

写了一个新闻模型，一个新闻类型模型，模型如下：
新闻模型：
@Id
@AccessType(value = "property")
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;

@AccessType(value="property")
@Column(name="title")
private String title;

@AccessType(value="property")
@Column(name="content")
private String content;

@AccessType(value="property")
@Column(name="write_date")
private Date write_date;

@ManyToOne
@JoinColumn(name="news_type", nullable=true, insertable = true, updatable = true)
private NewsType newsType;

新闻类型模型：
@Id
@AccessType(value = "property")
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;

@AccessType(value="property")
@Column(name="type_name")
private String typeName;

@OneToMany(mappedBy = "news_type", cascade = CascadeType.ALL,fetch = FetchType.LAZY)
private List<NewsInfo> nif;
报错如下：
Error creating bean with name 'menuDAO' defined in file [E:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\fykj\WEB-INF\classes\base\system\dao\MenuDAO.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.hibernate.SessionFactory]: : Error creating bean with name 'sessionFactory' defined in file [E:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\fykj\WEB-INF\classes\applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: news.model.NewsInfo.news_type in news.model.NewsType.nif; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in file [E:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\fykj\WEB-INF\classes\applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: news.model.NewsInfo.news_type in news.model.NewsType.nif
如果我去掉新闻类型这边的一对多关系，就不会报错，大家帮我看看，估计是哪里的问题？
居然没有人回答~自己摸索了一下，让我来告诉大家，
@OneToMany(mappedBy = "news_type", cascade = CascadeType.ALL,fetch = FetchType.LAZY) 这里的mappedBy 要对应
@ManyToOne
@JoinColumn(name="news_type", nullable=true, insertable = true, updatable = true)
private NewsType newsType;的NewsType对象名，也就是newsType而不是字段名news_type。
就说这么多，希望大家能看懂，祝大家学习进步，工作顺利！

Answer 1

lz你的问题也太难了吧，不过占个位置可以学习一下，有了答案在回来看看，学习一下哈，站位啦