MultipleBagFetchException, когда я пытаюсь загрузить сущность с 2 коллекциями, используйте JPA EntityGraph - PullRequest
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MultipleBagFetchException, когда я пытаюсь загрузить сущность с 2 коллекциями, используйте JPA EntityGraph

0 голосов
/ 26 февраля 2019

У меня есть пользовательский объект: 

@ToString
@Data
@Entity
@Table(name = "users")
@NamedEntityGraph(name = "UserWithItems",
        attributeNodes = {
                @NamedAttributeNode("items"),
                @NamedAttributeNode("roles")
        })
public class User {

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

    @Column(name = "name")
    private String name;

    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
    private List<Item> items;

    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
    private List<Role> roles;
}

элемент: 

@ToString(exclude = "user")
@Data
@Entity
@Table(name = "items")
public class Item {

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

    @Column(name = "name")
    private String name;

    @ManyToOne
    @JoinColumn(name = "user_id", referencedColumnName = "id", nullable = false)
    private User user;

}

роль: 

@ToString
@Data
@Entity
@Table(name = "roles")
public class Role {

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

    @Column(name = "name")
    private String name;

    @ManyToOne
    @JoinColumn(name = "user_id", referencedColumnName = "id", nullable = false)
    private User user;
}

Я хочу загрузить пользователя с элементами и ролями.Я использую @NamedEntityGraph.Это мой репозиторий: 

@EntityGraph(value = "UserWithItems", type = EntityGraph.EntityGraphType.LOAD)
@Query("select u from User u where u.id = ?1 and u.name =?2")
User getOneById(Long id, String name);

Но я получаю ошибку: 

Caused by: org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags: [com.example.egerload.entity.User.roles, com.example.egerload.entity.User.items]
    at org.hibernate.loader.BasicLoader.postInstantiate(BasicLoader.java:75) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.loader.hql.QueryLoader.<init>(QueryLoader.java:108) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:212) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:143) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:119) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:85) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.makeQueryParametersForExecution(AbstractProducedQuery.java:1350) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1539) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1505) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
    ... 41 common frames omitted
...