Java 给定的Json对象值无法转换为字符串

我尝试将Armor对象放入设备对象，并将其以JSONB格式存储在Hero实体的数据库中。 有一些实体：

@MappedSuperclass
@Data
@AllArgsConstructor
@JsonTypeInfo(
    use = JsonTypeInfo.Id.NAME,
    property = "type")
@JsonSubTypes({
    @Type(value = Armor.class, name = "armor"),
})
public abstract class Item {

  @Id
  private Integer id;

  private String name;

  private int count;

  public Item() {

  }
}

@Entity
@TypeDefs({
    @TypeDef(name = "pgsql_enum", typeClass = PostgreSQLEnumType.class)
})
@Getter
@Setter
public class Armor extends Item implements Serializable {

  private int armorStat;

  @Type(type = "pgsql_enum")
  @Enumerated(value = EnumType.STRING)
  private ArmorType armorType;

  private String description;

  public Armor() {

  }

  public Armor(Integer id, String name, int count, int armorStat,
      ArmorType armorType, String description) {
    super(id, name, count);
    this.armorStat = armorStat;
    this.armorType = armorType;
    this.description = description;
  }
}

@Entity
@Data
public class Hero {

  @Id
  @GeneratedValue
  private Long id;

  private String name = "";

  private int fame = 0;

  private int gold = 0;

  private int tiredness = 100;

  private int hp = 10;

  private int damage = 1;

  private int defense = 1;

  @Type(type = "jsonb")
  @Column(columnDefinition = "jsonb")
  private Equipment equipment;

  @Type(type = "jsonb")
  @Column(columnDefinition = "jsonb")
  private Inventory inventory;

  private String kingdom;

  @OneToOne(fetch = FetchType.LAZY)
  @PrimaryKeyJoinColumn
  private User user;

  public Hero() {
    this.equipment = new Equipment();
    this.inventory = new Inventory();
  }
}

@Data
public class Equipment implements Serializable {

  private Armor helmet;

  private Armor chestplate;

  private Armor gloves;

  private Armor boots;

}

当我试图设置设备并将其保存到数据库时，它会抛出如下异常：

Caused by java.lang.IllegalArgumentException: The given JSON object value: Equipment(helmet=Item(id=1, name=Leather helmet, count=1), chestplate=null, gloves=null, boots=null) cannot be transformed to a String

服务层代码：

Hero hero = user.getHero();
Equipment equipment = hero.getEquipment();
Armor armor = armorRepository.getOne(dataParser.getItemId(user.getAttributes().getExecutable()));
equipment.setHelmet(armor);
userService.save(user);

---

我不知道怎么解决这个问题。请给我一些解决问题的建议。

为什么设备没有

@实体

？因为我不想将其存储在数据库中。只需将其作为JSONB放入表中即可