hibernate报错：Use of @OneToMany or @ManyToMany targeting an unmapped class:

报错如下：

org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: 
pp.entity.Employee.departments[pp.entity.Department]
           

1.hibernate.cfg.xml忘记了：

<session-factory>
	<mapping class="pp.entity.Department"/>
</session-factory>      

 2.忘记了注解：

@Entity
@Table
public class Department {
//...
}