@Entity
@Table(name="Teacher")

public class Teacher implements Serializable {

    @EmbeddedId
    private PK pk = new PK();

    @OneToMany(cascade = {CascadeType.ALL})
    @JoinColumn(name="teacher_id")   
    private List<Student> student;

    public List<Student> getStudent() {
        return student;
    }

    public void setStudent(List<Student> student) {
        this.student = student;
    }   
}


/////////////////////
@Entity
@Table(name="Student")

public class Student implements Serializable {

    @Id
    @Column(name="id")   
    private int id;

    @ManyToOne
    @JoinColumns ( {@JoinColumn(nullable=false, name="id"),
                    @JoinColumn(nullable=false, name="name")})
    private Teacher teacher;
}

///////////////////////////
@Embeddable
public class PK implements Serializable
{
      private int id;
      private String name;
}