Associations marked as mappedBy must not define database mappings like @JoinTable or @JoinColumn

异常：Associations marked as mappedBy must not define database mappings like @JoinTable or @JoinColumn

错误代码：@OneToMany(targetEntity = User.class, cascade = { CascadeType.REMOVE, CascadeType.PERSIST }, mappedBy = "department")
@JoinColumn(name = "department_id")
public Set<User> getUsers() {
return users;
}

查出结果发现：在4.2版本中@JoinColumn与mappingBy是互斥的，之前在hibernate.3.3.2中都是正确无误的,也就是hibernate.3.3.2允许这两个互相存在。现在版本升级到了hibernate4.2，在4.2新的版本中是不允许这两个共存的，把mappBy="parent"去掉就Ok了。

改成正确代码：

@OneToMany(targetEntity = User.class, cascade = { CascadeType.REMOVE, CascadeType.PERSIST })
@JoinColumn(name = "department_id")
public Set<User> getUsers() {
return users;
}