Problem with Gilead Integration in GWT, Spring and JPA

hey,
I'm a newbie with these frameworks. Firstly i want to write a small
web app with gwt for the frontend, spring for backend and jpa for the
persistence operations. I use Hibernate as JPA implementation.

I started with a simple construction (2 simply entities, 2 DAO,1
remote service). I have no problems with this example. After i had
extended the entities with lists, i got some problems with the lazy
loading and serialization. Therefore i searched for solution and found
the Gilead Framework.

Now i have following problem:
org.hibernate.LazyInitializationException: failed to lazily initialize
a collection of role: <list attribute of my class>, no session or
session was closed
at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:
383)
at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:
375)

I don't understand the problem, because i marked the service method
with @Transactional(propagation=Propagation.NESTED, readOnly=true).
What is the cause of my problem?
thanks in advance

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