Item properties

ItemEntities

@Entity
public class Item implements Serializable {

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

  private String name;

  @MapKeyJoinColumn
  @ManyToMany(cascade = CascadeType.ALL)
  private Map<ItemProperty, ItemPropertyValues> properties;

}

@Entity
public class ItemProperty implements Serializable {

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

  private String name;

}

@Entity
public class ItemPropertyValues implements Serializable {

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

    @ElementCollection(fetch = FetchType.EAGER, targetClass = String.class)
    private List<String> propertyValues;

}