Hibernate Lazy loading not work in OneToOne relation

Question

In my company we migrated one old app from Hibernate 2 to Hibernate 4. My task was to move all xml entities to annotations. After moving it lazy loading in OneToOne relationship stop working.

entity a xml:

<id name="entityAid" type="integer" column="entityAid_id">
<one-to-one name="entityB" entity-name="EntityB"
        property-ref="entityA" />

entity b xml:

<property name="entityAid" type="integer" column="entityA_id" />
<many-to-one name="entityA" column="entityA_id" entity-name="EntityA" update="false" insert="false" />

I moved it with code:

entity a

 @OneToOne(fetch = FetchType.LAZY, mappedBy = "entityA")
 private EntityB storageRatecard;

entity b

@ManyToOne
@JoinColumn(name = "entityA_id", insertable = false, updatable = false)
private EntityA entityA;

Now when I run app lazy loading not work but worked on xml conf. I found:

Making a OneToOne-relation lazy

but nothing helps.(I cant use bytecode instrumentation)

What I am doing wrong? Why with xml everything is ok and with annotations no?

Krzysztof · Accepted Answer · 2015-06-09 11:02:47Z

2

What work for mi is Lazy one-to-one inverse relationships.

I read about this here (it is also a good tutorial how to use it). I hope it will help some one as it helps me.

answered Jun 9, 2015 at 11:02

Krzysztof

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Milkmaid · Accepted Answer · 2015-06-09 09:59:07Z

0

Change from:

@OneToOne(fetch = FetchType.LAZY, mappedBy = "entityA")
private EntityB storageRatecard;

to :

@OneTOMany(optional = false, fetch = FetchType.LAZY, mappedBy = "entityA")
private List<EntityB> storageRatecard;

Or if you want to make one to one bidirectional relationship than:

From:

@ManyToOne
@JoinColumn(name = "entityA_id", insertable = false, updatable = false)
private EntityA entityA;

to:

@OneToOne
@JoinColumn(name = "entityA_id", insertable = false, updatable = false)
private EntityA entityA;

edited Jun 9, 2015 at 9:59

answered Jun 9, 2015 at 5:42

Milkmaid

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4 Comments

Krzysztof Over a year ago

Thank you for answer.I need to have one to one bidirectional relationship. I try yours solution earlier but it not help.

Milkmaid Over a year ago

@ognistysztorm The main idea is to have @OneToOne annotations on both parameters or @OneToMany and @ManyToOne

Krzysztof Over a year ago

I tried use OneToOne instead ManyToOne but as I wrote lazy loading still not works. I cant understand why lazy loading work when I am using hbk.xml?

Milkmaid Over a year ago

It's because @OneToOne lazzy works little bit diferently look here

Community · Accepted Answer · 2017-05-23 12:08:48Z

0

JPA eager loads single ended association. Check the following link for more details: JPA default fetch type

edited May 23, 2017 at 12:08

CommunityBot

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answered Jun 9, 2015 at 21:44

codedabbler

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