Hibernate exception with @MapsId, @EmbeddedId

Question

I\'ve got a problem with @MapsId annotation and @EmbeddedId. When running a code in Hibernate I get:

Caused by: org.hibernate.Pr

Answer 1

I had the same problem and fixed it by doing the following, when Hibernate attempts to set the values for Employee.id, employee.id is null, just instantiate employee.id and you'll be set.

@Entity
public class Employee implements Serializable {

    @EmbeddedId
    private EmployeeId id = new EmployeeId();

    private String firstName;

    @ManyToOne
    @MapsId("serverId")
    private Server server;

    @OneToOne
    @MapsId("websiteId")
    private Website website;

    public Employee() {}

    public Employee(String firstName, Server server, Website website) {
        this.firstName = firstName;
        this.server = server;
        this.website = website;
    }
}