NamedEntityGraph：Hibernate投擲不能同時獲取多個袋子異常嵌套收集

Question

我得到「不能同時獲取多個袋子」的嵌套收集。 以下是實體和實體圖定義的外觀。 Hibernate的版本：4.3.7 彈簧數據的JPA：1.8.1 '

@Entity 
@Table(name = "ORGANISATION_GROUP") 
@Where(clause = "IS_DELETED <> 1") 
@NamedEntityGraphs(value = { @NamedEntityGraph(name = "onlyOrganisations", attributeNodes = { @NamedAttributeNode(value = "organisations", subgraph = "lightOrganisation") }, 
     subgraphs = { @NamedSubgraph(name = "lightOrganisation", attributeNodes = { @NamedAttributeNode(value = "locations") }) }) }) 
public class OrganisationGroup implements Serializable{ 

    private static final long serialVersionUID = 1L; 

    @Id 
    private Long id; 

    @ManyToMany() 
    @AuditJoinTable(name = "ORGANISATION_GROUP_MEMBER_AUD") 
    @JoinTable(name = "ORGANISATION_GROUP_MEMBER", joinColumns = @JoinColumn(name = "ORGANISATION_GROUP_ID", referencedColumnName = "ID"), inverseJoinColumns = @JoinColumn(
      name = "ORGANISATION_ID", referencedColumnName = "ID")) 
    private List<Organisation> organisations = new ArrayList<>(0); 

} 

@Entity 
@Table(name = "ORGANISATION") 
public class Organisation implements Serializable { 

    private static final long serialVersionUID = 1L; 
    @Id 
    private Long id; 

    @Column(name = "name", length = 255, nullable = false) 
    private String name; 

    @OneToMany(mappedBy = "organisationId", cascade = CascadeType.ALL, orphanRemoval = true) 
    @OrderBy(value = "location ASC") 
    private List<OrganisationLocation> locations; 

} 

@Entity 
@Table(name = "ORGANISATION_LOCATIONS") 
public class OrganisationLocation implements Serializable { 
    private static final long serialVersionUID = 1L; 

    @Id 
    private Long id; 

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

} 

` 我試圖用@LazyCollection上的位置屬性，但仍然得到同樣的異常。然而，同樣的事情沒有實體圖並且將位置設置爲獲取渴望類型。如何使用實體圖解決這個錯誤？

Answer 1

除非您有充分的理由不這樣做，否則請嘗試更改您的收藏集以使用Set而不是List。