在尝试将StudentID保存到Student_ID表时，我遇到了下面的异常。我不知道如何保存具有复合主键的实体本身。
Org.hibernate.TypeMismatchException：为类StudentIdEntity提供了错误类型的ID。应为：StudentIdEntity，获取类java.lang.Long|ConsoleCatcherOutputStream:write
下面是我的代码：

@Entity
@Table(name = "STUDENT_ID")
@IdClass(StudentIdEntity.class)
public class StudentIdEntity implements Serializable {
    @Id
    @Column(name = "ID_1")
    private Long id1;
    @Id
    @Column(name = "ID_2", nullable = false)
    private Long id2;

    public StudentIdEntity() {
    }

    public Long getId1() {
        return id1;
    }

    public void setId1(Long id1) {
        this.id = id1;
    }

    public Long getLocationId2() {
        return id2;
    }

    public void setLocationId2(Long id2) {
        this.id2 = id2;
    }
}

StudentIdEntity studentIdEntity = new StudentIdEntity();
studentIdEntity.setId1(id1);
studentIdEntity.setId2(id2);
studentImplement.save(studentIdEntity);