在连接表中映射值& hibernate.PropertyAccessException：无法通过反射设置器设置字段值

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（）和 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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