Patrick Casey wrote:
You're running into a collision between java's concept of object
identity and Hibernate's concept of object identity.
Two java objects are equal if they share the same memory address.
Two hibernate objects are equal if they have the same id.
So, if you do:
Session A = getSession();
Session B = getSession();
Object obA = A.load(foo.class, "id");
A.evict(obA);
Object obB = B.load(foo.class, "id");
obA and obB now both reference the same *database* object, but are
distinct *java* objects.
Now when you try to do:
B.lock(obA, LockMode.NONE);
You'll throw an error because session B already *has* the same
database object (obB) in memory and hence can't lock obA.
--- Pat
-----Original Message-----
From: Scott F. Walter [mailto:[EMAIL PROTECTED]
Sent: Sunday, May 29, 2005 10:37 PM
To: Tapestry users
Subject: Weird Tapestry/Spring/Hibernate Problem
For the record I am using Hibernate/Tapestry/Spring with the Spring
OpenViewInSession Filter.
I have an object that is stored in my Visit object that contains a lazy
collection. On a page inside the pageBeginRenderer, I attempt to access
the lazy collection and I get the standard "Failed to lazily initialize
a collection - no session or session was closed" exception. So right
before the code I access the collection I attempt to reattach the object
in the Visit with the Hibernate lock method. This time I get the
exception "NonUniqueObjectException: a different object with the same
identifier value was already associated with the session
I am in a catch 22. First Hibernate tells me I'm not in a session, but
when I try to bring the object into the session it tells me that I'm
already in the session?
Any clues or suggesions.
Scott F. Walter Scott F. Walter
Principal Consultant
Vivare, Inc.
E: [EMAIL PROTECTED]
E: [EMAIL PROTECTED]
Visit scottwalter.com <http://scottwalter.com> --Point. Click. Explore!
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I understand what you're saying, so is there any way to get around
this??? Here is the code that I am using in my pageBeginRender
Session session =
SessionFactoryUtils.getSession((SessionFactory)getGlobal().getSpringContext().getBean("sessionFactory"),
false);
try {
session.lock(website, LockMode.NONE); //throws exceptio
website = (Website) session.get(Website.class,
website.getId());
} catch(HibernateException he) {
he.printStackTrace();
}
--
Scott F. Walter Scott F. Walter
Principal Consultant
Vivare, Inc.
E: [EMAIL PROTECTED]
E: [EMAIL PROTECTED]
Visit scottwalter.com <http://scottwalter.com> --Point. Click. Explore!
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