Hibernate：外键的列数错误

为了解决referencedColumnName异常

在用户放置

@ManyToMany(cascade={CascadeType.PERSIST, cascadeType.MERGE})private Collection<Permission> permissions;

并在许可

@ManyToMany(mappedBy="permissions")@JoinTable(name="tblUserPermission", joinColumns={@JoinColumn(name="permissionId", referencedColumnName="permissionId")}, inverseJoinColumns={ @JoinColumn(name="username", referencedColumnName="username"),    @JoinColumn(name="countyId", referencedColumnName="countyId")})private Collection<User> users;

UserId类别

public class UserId implements Serializable {    private String username;    private Integer countyId;    // getter's and setter's    public boolean equals(Object o) {        if(o == null) return false;        if(!(o instanceof UserId)) return false;        UserId id = (UserId) o;        if(!(getUsername().equals(id.getUsername())) return false;        if(!(getCountyId().equals(id.getCountyId())) return false;        return true;    }    public int hachpre() {       // hashpre    }}

然后在User类中

@Entity@Table(name="tblUser")@IdClass(UserId.class)public class User ... {    @Id    private String username;    @Id    private Integer countyId;}

问候，