Spring hibernate error about lazy loading

Question

I'm just a spring + hibernate beginner. I'm doing a simple project and I set up eveything for transactions, a simple service, a simple dao and all the annotated beans.

Using list works, I can list the objects and their properties, using a Criteria query. But if I try to load an object with:

Session sess = sessionFactory.getCurrentSession();
Ordine res = (Ordine) sess.load(Ordine.class, id);
return res;

the query seems to work fine, but I get a nasty exception when the View tries to read a property (a string):

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

I even noticed this is the startup logs:

INFO: Bean 'mySessionFactory' of type [class org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

What does all this mean?

Johan Sjöberg · Accepted Answer · 2011-01-31 21:51:42Z

4

You have a few choises the way I see it

Force your object to not be loaded lazily (e.g., set fetch=FetchType.EAGER on your persistence annotations).
OpenSessionInViewFilter
Invoke the methods of your routine in data layer (to load the values) before invoking them in your view.

[Edit] This does not at all seem to work as I initially suggested.

Add transactions. Annotate your controller routine using @Transactional.

edited Jan 31, 2011 at 21:51

answered Jan 31, 2011 at 17:48

Johan Sjöberg

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5 Comments

Sean Patrick Floyd Over a year ago

Annotate your controller routine using @Transactional Does that work? The view is beyond the controller's scope, isn't it?

Johan Sjöberg Over a year ago

I tried it out once, and if I remember correctly it behaved well (my memory might be hazy though). This of course assumes you have all spring-configuration needed for transaction scanning.

sourcedelica Over a year ago

This answer is right, minus the @Transactional per Sean's comment.

gotch4 Over a year ago

I tried to put FetchType.Eager, no success. I put the OpenSessionInViewIntercepto.... nothing.

Johan Sjöberg Over a year ago

I tried both and can verify that they work. Can you illustrate with more code what you're doing? E.g., @OneToMany(..., fetch=...) ? Also, when using OSIV you should place it in the same appcontext as your controller definitions, see e.g. this.

Sean Patrick Floyd · Accepted Answer · 2011-01-31 17:36:20Z

0

You probably need to use the OpenSessionInViewFilter

answered Jan 31, 2011 at 17:36

Sean Patrick Floyd

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Comments

Sam Heymann · Accepted Answer · 2011-01-31 18:35:42Z

0

Sean,

Johan's suggestion about setting fetch=FetType.EAGER is your simplest solution. You should be careful using this solution, though. Sometimes you can solve your problem by modifying your dao query to do a left join fetch on the related entity that you're interested in. eg:

Query q = this.em.createQuery("select x from PrimaryEntity x \n"
+ "left join fetch x.secondaryEntityField \n "
+ "where x.selectionProperty = :selection");

answered Jan 31, 2011 at 18:35

Sam Heymann

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1 Comment

Sean Patrick Floyd Over a year ago

Uhm, Sean did not ask the question :-)

esaj · Accepted Answer · 2011-01-31 20:19:10Z

0

org.hibernate.Hibernate -class has some handy static utility methods, for example see Hibernate.initialize. You still need an open session for it though. The easiest ways are probably using OpenSessionInViewFilter, setting fetch-types to eager or modifying the query to load the lazy-relations, as suggested in the other answers.

answered Jan 31, 2011 at 20:19

esaj

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