CODEWITHSUNDEEP
hibernatespring-mvc
user2172625
user2172625

Reputation: 483

Hibernate - could not initialize proxy - no Session

I'm using spring-mvc and hibernate session-factory. 

@Controller
    |
    ->  @Service (@Transactional)
            |
            -> @Repository

I have 2 entities, User and Address.

User has a List<Address> with FetchType=LAZY.

If I add an Addressobject via user, within a @Controller, I get failed to lazily initialize a collection of role - could not initialize proxy - no Session exception.

But If I do this inside the service layer which is wrapped with @Transactional, operation works nicely.

I found out about hibernate proxies,...etc.

My question is, why @Controller cannot change an entity object which is retried from @Service layer. Because @Controller has no idea whether it is a hibernate proxy or anything else. To the @Controller it is just an object. So why I'm getting an error, if I change an entity object inside the @Controller. This is only happening to entity properties which are marked as FetchType=LAZY.

Upvotes: 0

Views: 1809

Answers (1)

VGaur
VGaur

Reputation: 715

When you choose a property to be lazily loaded, hibernate wraps those around a proxy having the session object in which the parent was fetched.

If you try to access the property after the session scope you will get this error.

Looks like your session is getting created and closed in service layer.

Implement OpenSessionInView Filter provided by spring, it will close the session after response being send.

Upvotes: 2

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