Java 连接表中的映射值&；hibernate.PropertyAccessException:无法通过反射设置器设置字段值

第一次张贴到stackoverflow，所以请原谅我没有正确张贴。我在一个旧线程上发布了一个带有代码的后续问题，因为我无法得到正确运行的推荐解决方案。我正在使用OpenXava，收到错误“无法执行保存操作：org.hibernate.PropertyAccessException:无法通过org.OpenXava.invoicing.model.CourseAssignmentId.course的反射设置程序设置字段值”。感谢您的帮助。我的代码：

用户类别：

@Entity
@Table(name="users")
public class User {
    @Id
    @Column(name="pk1")
    private Long id;

    public Long getid() {
        return id;
    }

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

    @Column(name="user_id")
    private String userID;

    public String getuserID(){
        return userID;
    }

    public void setuserID(String userID) {
        this.userID = userID;
    }

    @OneToMany(mappedBy="user")
    private Collection<CourseAssignment> courseAssignments;

    public Collection<CourseAssignment> getcourseAssignments() {
        return courseAssignments;
    }

    public void setcourseAssignments(Collection<CourseAssignment> courseAssignments) {
        this.courseAssignments = courseAssignments;
    }

}

CourseAssignmentId类：

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

    private static final long serialVersionUID = 1L;


    @Column(name="user_pk1")
    private Long user;

    public Long getuser() {
        return user;
    }

    public void setuser(Long user) {
        this.user = user;
    }

    @Column(name="crsmain_pk1")
    private Long course;

    public Long getcourse() {
        return course;
    }

    public void setcourse(Long course) {
        this.course = course;
    }   
}

有些事情可以尝试：

---

• 从

  CourseAssignmentId

  中删除

  @Embeddeble

  注释（我认为在这种情况下不合适）
• 从

  CourseAssignmentId

• 在

  CourseAssignmentId

---

感谢您指出这一点。然而，随着这一点的纠正，同样的问题。在这个问题上再多说一点…创建一个用户是可以的。开设一门课程很好。在保存CourseAssignment时，会抛出hibernate问题。从

CourseAssignmentId

中删除

@Embeddeble

和

@Column

注释解决了此问题。非常感谢！！你想干什么？

@Entity
@Table(name="course_users")
@IdClass(CourseAssignmentId.class)
public class CourseAssignment {

    @Id
    @ManyToOne
    @JoinColumn(name="user_pk1")
    private User user;

    public User getuser() {
        return user;
    }

    public void setuser(User user) {
        this.user = user;
    }

    @Id
    @ManyToOne
    @JoinColumn(name="crsmain_pk1")
    private Course course;

    public Course getcourse() {
        return course;
    }

    public void setcourse(Course course) {
        this.course = course;
    }

    @Column(name="role")
    private String role;

    public String getrole() {
        return role;
    }

    public void setrole(String role) {
        this.role = role;
    }
}

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

    private static final long serialVersionUID = 1L;


    @Column(name="user_pk1")
    private Long user;

    public Long getuser() {
        return user;
    }

    public void setuser(Long user) {
        this.user = user;
    }

    @Column(name="crsmain_pk1")
    private Long course;

    public Long getcourse() {
        return course;
    }

    public void setcourse(Long course) {
        this.course = course;
    }   
}