Spring data rest POST dosen't work for foreign keys

[William Weiss]

Please I created a REST api using Spring data rest JPA but I have a real big problem :
when I try to post to my REST api everything works except that the foreign key value doesn't get updated ...
I tried to send the value more than once but it doesn't work at all

import javax.persistence.*;
import java.sql.Date;
import java.util.Collection;

@Entity
@Table(name = "users", schema = "", catalog = "scout")
public class UsersEntity {
    private Integer userid;
    private Integer profilphotoid;
    private String firstName;
    private String familyName;
    private String username;
    private String email;
    private String password;
    private Date createdAt;
    private Integer photoCount;
    private Integer musicCount;
    private Integer videoCount;
    private Collection<CommentsEntity> commentsesByUserid;
    private Collection<FriendRequestEntity> friendRequestsByUserid;
    private Collection<FriendsEntity> friendsesByUserid;
    private Collection<PostsEntity> postsesByUserid;
    private ProfilePhotosEntity profilePhotosByProfilphotoid;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name = "USERID", nullable = false, insertable = true, updatable = true)
    public Integer getUserid() {
        return userid;
    }

    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    @Basic
    @Column(name = "PROFILPHOTOID", nullable = true, insertable = false, updatable = false)
    public Integer getProfilphotoid() {
        return profilphotoid;
    }

    public void setProfilphotoid(Integer profilphotoid) {
        this.profilphotoid = profilphotoid;
    }

    @Basic
    @Column(name = "FIRST_NAME", nullable = true, insertable = true, updatable = true, length = 30)
    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    @Basic
    @Column(name = "FAMILY_NAME", nullable = true, insertable = true, updatable = true, length = 30)
    public String getFamilyName() {
        return familyName;
    }

    public void setFamilyName(String familyName) {
        this.familyName = familyName;
    }

    @Basic
    @Column(name = "USERNAME", nullable = true, insertable = true, updatable = true, length = 20)
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Basic
    @Column(name = "EMAIL", nullable = true, insertable = true, updatable = true, length = 100)
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Basic
    @Column(name = "PASSWORD", nullable = true, insertable = true, updatable = true, length = 100)
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Basic
    @Column(name = "CREATED_AT", nullable = true, insertable = true, updatable = true)
    public Date getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(Date createdAt) {
        this.createdAt = createdAt;
    }

    @Basic
    @Column(name = "PHOTO_COUNT", nullable = true, insertable = true, updatable = true)
    public Integer getPhotoCount() {
        return photoCount;
    }

    public void setPhotoCount(Integer photoCount) {
        this.photoCount = photoCount;
    }

    @Basic
    @Column(name = "MUSIC_COUNT", nullable = true, insertable = true, updatable = true)
    public Integer getMusicCount() {
        return musicCount;
    }

    public void setMusicCount(Integer musicCount) {
        this.musicCount = musicCount;
    }

    @Basic
    @Column(name = "VIDEO_COUNT", nullable = true, insertable = true, updatable = true)
    public Integer getVideoCount() {
        return videoCount;
    }

    public void setVideoCount(Integer videoCount) {
        this.videoCount = videoCount;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        UsersEntity that = (UsersEntity) o;

        if (createdAt != null ? !createdAt.equals(that.createdAt) : that.createdAt != null) return false;
        if (email != null ? !email.equals(that.email) : that.email != null) return false;
        if (familyName != null ? !familyName.equals(that.familyName) : that.familyName != null) return false;
        if (firstName != null ? !firstName.equals(that.firstName) : that.firstName != null) return false;
        if (musicCount != null ? !musicCount.equals(that.musicCount) : that.musicCount != null) return false;
        if (password != null ? !password.equals(that.password) : that.password != null) return false;
        if (photoCount != null ? !photoCount.equals(that.photoCount) : that.photoCount != null) return false;
        if (profilphotoid != null ? !profilphotoid.equals(that.profilphotoid) : that.profilphotoid != null)
            return false;
        if (userid != null ? !userid.equals(that.userid) : that.userid != null) return false;
        if (username != null ? !username.equals(that.username) : that.username != null) return false;
        if (videoCount != null ? !videoCount.equals(that.videoCount) : that.videoCount != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = userid != null ? userid.hashCode() : 0;
        result = 31 * result + (profilphotoid != null ? profilphotoid.hashCode() : 0);
        result = 31 * result + (firstName != null ? firstName.hashCode() : 0);
        result = 31 * result + (familyName != null ? familyName.hashCode() : 0);
        result = 31 * result + (username != null ? username.hashCode() : 0);
        result = 31 * result + (email != null ? email.hashCode() : 0);
        result = 31 * result + (password != null ? password.hashCode() : 0);
        result = 31 * result + (createdAt != null ? createdAt.hashCode() : 0);
        result = 31 * result + (photoCount != null ? photoCount.hashCode() : 0);
        result = 31 * result + (musicCount != null ? musicCount.hashCode() : 0);
        result = 31 * result + (videoCount != null ? videoCount.hashCode() : 0);
        return result;
    }

    @OneToMany(mappedBy = "usersByUserid")
    public Collection<CommentsEntity> getCommentsesByUserid() {
        return commentsesByUserid;
    }

    public void setCommentsesByUserid(Collection<CommentsEntity> commentsesByUserid) {
        this.commentsesByUserid = commentsesByUserid;
    }

    @OneToMany(mappedBy = "usersByUserid")
    public Collection<FriendRequestEntity> getFriendRequestsByUserid() {
        return friendRequestsByUserid;
    }

    public void setFriendRequestsByUserid(Collection<FriendRequestEntity> friendRequestsByUserid) {
        this.friendRequestsByUserid = friendRequestsByUserid;
    }


    @OneToMany(mappedBy = "usersByFriendwithid")
    public Collection<FriendsEntity> getFriendsesByUserid() {
        return friendsesByUserid;
    }

    public void setFriendsesByUserid(Collection<FriendsEntity> friendsesByUserid) {
        this.friendsesByUserid = friendsesByUserid;
    }

    @OneToMany(mappedBy = "usersByUserid")
    public Collection<PostsEntity> getPostsesByUserid() {
        return postsesByUserid;
    }

    public void setPostsesByUserid(Collection<PostsEntity> postsesByUserid) {
        this.postsesByUserid = postsesByUserid;
    }

    @ManyToOne
    @JoinColumn(name = "PROFILPHOTOID", referencedColumnName = "PROFILPHOTOID")
    public ProfilePhotosEntity getProfilePhotosByProfilphotoid() {
        return profilePhotosByProfilphotoid;
    }

    public void setProfilePhotosByProfilphotoid(ProfilePhotosEntity profilePhotosByProfilphotoid) {
        this.profilePhotosByProfilphotoid = profilePhotosByProfilphotoid;
    }
}

The value that don't get updated is : "photoprofilid" it's a foreign key from another table
what I tried is :

curl -i -X POST -H "Content-Type:application/json" -d "{\"profilphotoid\" : \"http://localhost:8080/profilephotos/1\" }" http://localhost:8080/users