public enum Grade {
    _1("1"),
    _2("2"),
    _3("3"),
    _7bPLUS("7b+"),
    _7c("7c"),
    _7cPLUS("7c+"),
    _8a("8a"),
    _8aPLUS("8a+"),
    _8b("8b"),
    _8bPLUS("8b+"),
    _8c("8c"),
    _8cPLUS("8c+"),
    _9a("9a"),
    _9aPLUS("9a+"),
    _9b("9b"),
    _9bPLUS("9b+"),
    _9c("9c");

    private String name;

    Grade(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return name;
    }
}

import javax.persistence.*;

@Entity
public class Itinerary {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(length = 1000)
    private String description;

    private Integer length;

    @ManyToOne(fetch = FetchType.EAGER)
    private Sector sector;


    private Grade grade;
}