Hibernate：如何用其中一个没有ID的两个表联接？

我的两个表（在SQL Server中）：

create table cluster (
    id bigint primary key identity(1,1),
    name varchar(100)
)

create table cluster_member (
    cluster_id bigint,
    member_name varchar(100)
)

表cluster_member没有ID。列cluster_id类似于外键，引用了群集表中的id列。

我使用了Hiberate Tools来生成2个@Entity类和一个@Embeddable类。我添加了一些类变量以及@OneToMany和@ManyToOne批注，试图将两个表连接在一起。但我收到一个错误消息：

org.hibernate.MappingException: Foreign key (FK_hk6sas3oycvcljwbjar7p9ky3:cluster_member [cluster_id,member_name])) must have same number of columns as the referenced primary key (cluster [id])

错误消息很清楚。但是我不知道如何解决它。请帮忙。

这是我的代码：

Cluster.java：

@Entity
@Table(name = "cluster" )
public class Cluster implements java.io.Serializable {

    private long id;
    private String name;
    private Set<ClusterMember> members;

    @Id
    @Column(name = "id", unique = true, nullable = false)
    public long getId() {
            return this.id;
    }

    @Column(name = "name", length = 100)
    public String getName() {
            return this.name;
    }

    @OneToMany(mappedBy = "id")
    public Set<ClusterMember> getMembers() {
            return members;
    }
}

ClusterMember.java：

@Entity
@Table(name = "cluster_member" )
public class ClusterMember implements java.io.Serializable {

    private ClusterMemberId id;
    private Cluster cluster;

    @EmbeddedId
    @AttributeOverrides({ @AttributeOverride(name = "clusterId", column = @Column(name = "cluster_id")),
                    @AttributeOverride(name = "memberName", column = @Column(name = "member_name", length = 100)) })
    public ClusterMemberId getId() {
            return this.id;
    }

    @ManyToOne
    @JoinColumn(name = "cluster_id")
    public Cluster getCluster() {
            return cluster;
    }
}

ClusterMemberId.java：

@Embeddable
public class ClusterMemberId implements java.io.Serializable {

    private Long clusterId;
    private String memberName;

    @Column(name = "cluster_id")
    public Long getClusterId() {
            return this.clusterId;
    }

    @Column(name = "member_name", length = 100)
    public String getMemberName() {
            return this.memberName;
    }
}

主要功能：

    @SuppressWarnings("deprecation")
    public static void main(String[] args) {
            sessionFactory = new Configuration().configure().buildSessionFactory();
            Session session = sessionFactory.getCurrentSession();
            Transaction tx = session.beginTransaction();
            Criteria criteria = session.createCriteria("my.hibernate.table.Cluster");
            criteria.add(Restrictions.like("name", "%ABC%"));
            @SuppressWarnings("unchecked")
            List<Cluster> clusters = criteria.list();
            for (Cluster cluster: clusters) {
                    System.out.println(cluster.toString());
            }
            tx.commit();
            sessionFactory.close();
    }

hibernate.cfg.xml

             <mapping class="my.hibernate.table.Cluster" />
             <mapping class="my.hibernate.table.ClusterMember" />