Dear all,

version hibernate 3.3.1

annotation config:


I want to load the full Object Organization with its relations also loaded.

The problem is, for Relation having a Notary (sub class of Person) in their dependency I sometimes have the following WARN log:
10123 WARN org.hibernate.engine.StatefulPersistenceContext.ProxyWarnLog - Narrowing proxy to class be.fednot.bcn.domain.model.Notary - this operation breaks ==

What is strange is that it doesn't happen always, sometimes I get the Notary loaded. The SQL seems to load all the needed info.

This is a problem for me because I need to know if the Relation holds a Person or a Notary.

Any one knows how to fix this problem?

Bruno

Don't worry about his warning, just put the following in your log file and you shouldn't see it anymore:


Why it happens?
Suppose you have a Product with a many-to-one association to Address. Both are entities and Address has a ShippingAddress subclass.

Let's Session.get(..) a Product from the db that has ShippingAddress as association. Because the many-to-one is lazy, it will return a Address proxy. Note that this is a Address proxy and not a ShippingAddress proxy as the proxy will always match the type that is mentioned in Product (see the hibernate book for details).
This proxy is stored by Hibernate in his proxy cache.
Now we Session.get(...) the same ShippingAddress from the db, the one that is associated to the Product that we used fetched from the db.
Now Hibernate will see that it already contains a proxy for this ShippingAddress and will return this. However, it will notice that the types aren't the same so a "downcasting" must occur. Because this latter action isn't possible with "proxies" it will create new one and return it...

As you can see, nothing to worry about.
You could consider making the Address a value type...
In my case that's no option.

Hope this helps,
Ed Bras

Hey there, I got a similar issue, but your solution does not work for me.

I got a class Ressource and a subclass SystemRessource.
Everything is working nice, but I got always a warning if I load some of my SystemRessource.



I have made the following entry in my jboss standalone.xml



Any idea what I can do?

Regards
LStrike

Using JBoss AS 7.1.3 and hibernate 4.1.6.Final

@LStrike it seems that the ProxyWarnLog has gone away in Hibernate 4 (I'd be happy to be wrong on that!) which is a shame since Steve Ebersole added it for this:

https://hibernate.atlassian.net/browse/HHH-1367

The only way I've got this working is to use:



Which is simply removing the ".ProxyWarnLog" (Edit and it adds in "internal" to the path)

(By the way - you need ERROR instead of WARN. It's logging at WARN level already so you need to go to the level above that).

@ RedYeti

Thank you very much, the message is gone from the log.

@LStrike - no problem!

You might be interested in this posting I just made (assuming someone answers it with something useful that is!)

https://forum.hibernate.org/viewtopic.php?f=1&t=1030440

@ RedYeti

I have added this to my log4j2.xml but because it's not able to override the jboss logging, the warning still shows up. Any idea how to suppress this?

<Logger name="org.hibernate.engine.internal.StatefulPersistenceContext" level="error" additivity="false">
<AppenderRef ref="ASYNC"/>
</Logger>

I am using hibernate 4.2.0.Final and jetty 9.0.5

WARN: HHH000179: Narrowing proxy to class ... - this operation breaks ==

Sorry but without being able to change the JBosss logging I can't see how there's any way to suppress it.