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Posted to users@tomee.apache.org by potgieterdl <de...@gmail.com> on 2012/10/15 22:18:08 UTC

Rest and lazy loaded JPA 2.0 hibernate entities

Hi All,

I`m running tomee rest 1.5.0 and have swapped openjpa to hibernate.
I`m having a issue is my rest service on returning a List<Customer> which is
throwing a lazy load exception :

org.hibernate.LazyInitializationException: could not initialize proxy - no
Session
        at
org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:180


This happens because the jpa session closes before the object conversion to
xml/json happens. so it cant load the mapped entities.

I`m looking for suggestions here around possible solutions. The only 1 i can
think of is creating DTO`s and mapping the values to them, but creates alot
of duplicaiton. Issue is i do need to know the primary key for the mapped
entity to send through.

Is there any other way that this can be achieved?

Thanks
Derick



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Re: Rest and lazy loaded JPA 2.0 hibernate entities

Posted by Romain Manni-Bucau <rm...@gmail.com>.

Hi,

Call e.getRelationship().size() before the end of the tx
Le 15 oct. 2012 22:18, "potgieterdl" <de...@gmail.com> a écrit :

> Hi All,
>
> I`m running tomee rest 1.5.0 and have swapped openjpa to hibernate.
> I`m having a issue is my rest service on returning a List<Customer> which
> is
> throwing a lazy load exception :
>
> org.hibernate.LazyInitializationException: could not initialize proxy - no
> Session
>         at
>
> org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:180
>
>
> This happens because the jpa session closes before the object conversion to
> xml/json happens. so it cant load the mapped entities.
>
> I`m looking for suggestions here around possible solutions. The only 1 i
> can
> think of is creating DTO`s and mapping the values to them, but creates alot
> of duplicaiton. Issue is i do need to know the primary key for the mapped
> entity to send through.
>
> Is there any other way that this can be achieved?
>
> Thanks
> Derick
>
>
>
> --
> View this message in context:
> http://openejb.979440.n4.nabble.com/Rest-and-lazy-loaded-JPA-2-0-hibernate-entities-tp4658042.html
> Sent from the OpenEJB User mailing list archive at Nabble.com.
>