spring data jpa - nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property

Question

Based on this tutorial I'm trying to create Many-to-Many Relationship Using a Composite Key Eventually I get the following error

The composite key itself have the following structure:

@Embeddable
@Data
public class MovieRatingsKey implements Serializable {

@Column(name = "movieid")
private Movies movieid;

@Column(name = "userid")
private Usrs userid;
}

Class Movies:

@Entity
@Data
public class Movies {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer movieid;

/*not related to the question*/

@OneToMany(mappedBy = "movieid", fetch = FetchType.LAZY)
private Set<Ratings> rates = new HashSet<>();
}

User:

@Entity
@Data
public class Usrs {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer userid;

@OneToMany(mappedBy = "userid", fetch = FetchType.LAZY)
private Set<Ratings> rates = new HashSet<>();
}

Associative table:

@Entity
@Data
public class Ratings {
@EmbeddedId
private MovieRatingsKey id;

/*not related to the question*/

@ManyToOne
@MapsId("movieid")
@JoinColumn(name = "movieid")
Movies movie;

@ManyToOne
@MapsId("userid")
@JoinColumn(name = "userid")
Usrs user;
}

question from:https://stackoverflow.com/questions/66051765/nested-exception-is-org-hibernate-annotationexception-mappedby-reference-an-unk

Answer 1

In your Usrs you have used userid in mappedBy is should be user as shown below.

@Entity
@Data
public class Usrs {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer userid;

@OneToMany(mappedBy = "user", fetch = FetchType.LAZY)
private Set<Ratings> rates = new HashSet<>();
}