Entity Repository Spring Error with Relationships

Question

I have a project using Spring Boot to serve JSON on a Webservice. An error occurred when adding the Repository class. If you remove it the program starts normally (no errors in the console, I don’t mean features).

The mistake is: http://www.cjoint.com/c/FGir7xhZgvR (I put it on Cjoint because it’s too big).

Classes are:

@RepositoryRestResource
public interface Sells extends PagingAndSortingRepository<Long, Sell> {

}

@Entity
public class Sell implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private Date sellDate;
    @OneToMany(mappedBy = "sell", targetEntity = SellItem.class,
        fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    private List<SellItem> sellItems;
    private Double total;
    // Getters e setter omitidos
}

@Entity
public class SellItem implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @ManyToOne
    private Product product;
    private Integer quantity;
    @ManyToOne
    @JoinColumn(name = "sell_id")
    private Sell sell;
    //Getters e setter omitidos
}

If necessary, ask for more information in the comments.

Answer 1

Hello, I don’t know if you have already identified your problem. I took a look at the error and saw that you declared your Restpository as follows:

public interface Sells extends PagingAndSortingRepository<Long, Sell> {
}

Since the correct way is:

public interface Sells extends PagingAndSortingRepository<Sell, Long> {
}

It seems to me you just reversed the order of the generic arguments of the interface Pagingandsortingrepository.