CODEWITHSUNDEEP
javaperformancehibernatehibernate-criteria
Damien Gallagher
Damien Gallagher

Reputation: 991

HIbernate - dont load Lazy Entities in an Eager Association

If I have the following classes in my project

    @Entity
@Table(name = "application_home_screen")
public class ApplicationHomeScreenVO implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Integer id;

    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({ CascadeType.ALL })
    @JoinColumn(name="image1_id")
    private ApplicationImageVO image1;

    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({ CascadeType.ALL })
    @JoinColumn(name="image2_id")
    private ApplicationImageVO image2;  
}



@Entity
@Table(name = "application_image")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class ApplicationImageVO implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Integer id;


    @OneToOne(fetch = FetchType.LAZY, mappedBy = "image1")
    @Cascade({ CascadeType.ALL })
    private ApplicationHomeScreenVO homeScreenImage1;   

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "image2")
    @Cascade({ CascadeType.ALL })
    private ApplicationHomeScreenVO homeScreenImage2;

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity1")
    @Cascade({ CascadeType.ALL })
    private OtherEntity1 otherEntity1;

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity2")
    @Cascade({ CascadeType.ALL })
    private OtherEntity2 otherEntity2;

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity3")
    @Cascade({ CascadeType.ALL })
    private OtherEntity3 otherEntity3;

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity4")
    @Cascade({ CascadeType.ALL })
    private OtherEntity4 otherEntity3;
}

When I load the ApplicationHomeVO - id expect only image1 and image2 to be loaded from the ApplicationImageVO class but that is not the case

All the other objects in the ApplicationImageVO class are also loaded even though they are marked as LAZY. Id expect only the ApplicationHomeScreenVO objects to be loaded

Is there any way to stop these other entites from being loaded?

Thank you Damie

Upvotes: 0

Views: 189

Answers (1)

Pras
Pras

Reputation: 1098

@OneToOne declared this way is mapped by PK and it has to be eagerly fetched ...

you can :

  • make it a @ManyToOne(fetch=FetchType.LAZY)

OR

  • declare a foreign key column :

@OneToOne(fetch = FetchType.LAZY) @JoinColumn(name="fk") public T getT()

EDIT

@Entity
@Table(name = "application_home_screen")
public class ApplicationHomeScreenVO implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Integer id;

    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({ CascadeType.ALL })
    @JoinColumn(name="image1_id")
    private ApplicationImageVO image1;

    @OneToOne(fetch = FetchType.EAGER)
    @Cascade({ CascadeType.ALL })
    @JoinColumn(name="image2_id")
    private ApplicationImageVO image2;  
}



@Entity
@Table(name = "application_image")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class ApplicationImageVO implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Integer id;


    @OneToOne(fetch = FetchType.LAZY, mappedBy = "image1")
    @Cascade({ CascadeType.ALL })
    private ApplicationHomeScreenVO homeScreenImage1;   

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "image2")
    @Cascade({ CascadeType.ALL })
    private ApplicationHomeScreenVO homeScreenImage2;

    @ManyToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity1")
    @Cascade({ CascadeType.ALL })
    private OtherEntity1 otherEntity1;

    @ManyToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity2")
    @Cascade({ CascadeType.ALL })
    private OtherEntity2 otherEntity2;

    @ManyToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity3")
    @Cascade({ CascadeType.ALL })
    private OtherEntity3 otherEntity3;

    @ManyToOne(fetch = FetchType.LAZY, mappedBy = "otherEntity4")
    @Cascade({ CascadeType.ALL })
    private OtherEntity4 otherEntity3;
}

Upvotes: 1

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