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EclipseLink 2.1.1 / Problem with @ManyToOne(fetch = FetchType.LAZY) [message #631242]

Wed, 06 October 2010 12:26

Martin Weiss
Messages: 6
Registered: October 2010

Junior Member

In my sample EntityManager.find() loads Person Entity although I set the fetch type to lazy:

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "PERSON_ID")
private Person person;

Why ? My expection is that EclipseLinks reads the db row during getPerson() invocation.
Many thanks,
Martin

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Re: EclipseLink 2.1.1 / Problem with @ManyToOne(fetch = FetchType.LAZY) [message #631295 is a reply to message #631242]

Wed, 06 October 2010 16:37

Tom Eugelink
Messages: 801
Registered: July 2009

Senior Member

Have you either specified the -javaagent option when starting Java (dynamic weaving) or postprocessed the classes (static weaving)? This puts in a decoupling layer on the variables which allows for lazy loading.

http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_ (ELUG)#How_to_Configure_Dynamic_Weaving_for_JPA_Entities_Usi ng_the_EclipseLink_Agent

Tom

On 6-10-2010 18:26, Martin Weiss wrote:
> In my sample EntityManager.find() loads Person Entity although I set the fetch type to lazy:
>
> @ManyToOne(fetch = FetchType.LAZY)
> @JoinColumn(name = "PERSON_ID")
> private Person person;
>
> Why ? My expection is that EclipseLinks reads the db row during getPerson() invocation.
> Many thanks,
> Martin

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Re: EclipseLink 2.1.1 / Problem with @ManyToOne(fetch = FetchType.LAZY) [message #631356 is a reply to message #631295]

Thu, 07 October 2010 04:37

Martin Weiss
Messages: 6
Registered: October 2010

Junior Member

Hi Tom,
many thanks for your answer. Lazy loading of JPA entities works perfectly for me when deploying to the JEE application server. However, when I am testing with JUnit in Eclipse, lazy loading is not enabled. I added -javaagent:eclipselink.jar to the JUnit configuration (program arguments). Any other ideas ?
Regards,
Martin

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