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问题描述

首先发布到stackoverflow,所以请原谅,如果我没有正确发布。我在旧线索上发布了带有代码的后续问题的联结表中的值,因为我无法获得推荐的解决方案以正常运行。我正在使用OpenXava并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的反射设置器设置字段值。任何帮助表示赞赏。我的代码:

用户类:

  @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)
私人收藏< CourseAssignment> courseAssignments;

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

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

}

课程分类:

  @Entity 
@Table(name =courses)
public class Course {

@Id
@Column(name =pk1)
私有长ID;

public Long getid(){
return id;
}

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

@Column(name =course_name)
私人字符串名称;

public String getname(){
return name;
}

public void setname(String name){
this.name = name;
}

@OneToMany(mappedBy =course)
私人收藏< CourseAssignment> courseAssignments;

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

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


}

CourseAssignment类:

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

@Id
@ManyToOne
@JoinColumn(name =user_pk1)
私人用户用户;

public User getuser(){
return user;
}

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


@Id
@ManyToOne
@JoinColumn(name =crsmain_pk1)
私人课程;

公开课程getcourse(){
return course;
}

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


@Column(name =role)
私人字符串角色;

public String getrole(){
return role;
}

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


CourseAssignmentId类:

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

private static final long serialVersionUID = 1L;


@Column(name =user_pk1)
私人长用户;

public long getuser(){
return user;
}

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

@Column(name =crsmain_pk1)
私人长课程;

public Long getcourse(){
return course;
}

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


解决方案

事情要尝试:


  • 从 @Embeddable 注释> CourseAssignmentId (我不认为这适用于这种情况)

  • 删除 @Column 来自 CourseAssignmentId
  • 的注释
  • 实现 equals() code> CourseAssignmentId


中的hashCode()

First post to stackoverflow, so please excuse if I did not post correctly. I posted a follow-up question with code on an old thread Mapping value in junction table to Entity as I am not able to get the recommended solution to function properly. I am using OpenXava and receive error "Impossible to execute Save action: org.hibernate.PropertyAccessException: could not set a field value by reflection setter of org.openxava.invoicing.model.CourseAssignmentId.course". Any help is appreciated. My code:

User Class:

@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;
    }

}

Course Class:

@Entity
@Table(name="courses")
public class Course {

    @Id
    @Column(name="pk1")
    private Long id;

    public Long getid() {
        return id;
    }

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

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

    public String getname() {
        return name;
    }

    public void setname(String name) {
        this.name = name;
    }   

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

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

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


}

CourseAssignment Class:

@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;
    }
}

CourseAssignmentId Class:

@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;
    }   
}
解决方案

Some things to try:

  • Removing the @Embeddable annotation from CourseAssignmentId (I don't think it is appropriate in this context)
  • Removing the @Column annotations from CourseAssignmentId
  • Implementing equals() and hashCode() in CourseAssignmentId

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10-28 07:31