AW: [hibernate-dev] clone a lazy-init Object

[Tobias Meyer]

I just wanted to make the hibernate team aware of this bug, so that the javassist library shipping with hibernate can be updated on occasion if there are no objections to that change.

I was also wondering, if there is a reason one should not use clones of Hibernate-instantiated objects, because I was puzzled this has not hit too many others before.


-----Ursprüngliche Nachricht-----
Von: Steve Ebersole [mailto:steven.ebersole at gmail.com] Im Auftrag von Steve Ebersole
Gesendet: Dienstag, 23. Juni 2009 16:20
An: Tobias Meyer
Cc: hibernate-dev at lists.jboss.org
Betreff: Re: [hibernate-dev] clone a lazy-init Object

Note sure what you are actually asking.  

Sure it seems like incorrect behavior from javassist...


On Tue, 2009-06-23 at 15:36 +0200, Tobias Meyer wrote:
> Hello List,
> 
>  
> 
> we ran into a problem with javassist when recently upgrading to
> hibernate 3.3.1.GA, whid did not occur with the previous cglib
> implementation. 
> 
> We sometimes make use of the cloneable interface and therefore have
> declared a public clone() on some objects.
> 
> If those objects are initially loaded lazily, even if they are fully
> initialized later on, a call to the clone() method will result in a
> java.lang.IllegalAccessError at runtime.
> 
> This is caused by the Javassist proxy, which exposes the protected
> clone() of java.lang.Object instead of the public definition from the
> interface, which I believe to be a bug.
> 
>  
> 
> I submitted a proposed fix for this at
> https://jira.jboss.org/jira/browse/JASSIST-85
> 
> The result of the fix is, that the clone method of the target is
> called, which returns a cloned instance of the target object (not a
> clone of the proxy object), which is exactly what we need.
> 
>  
> 
> Maybe someone can give their 2 cent if this is actually desired
> behavior or if this could cause unwanted side-effects.
> 
>  
> 
> I believe it's in every case better than the current state (runtime
> errors), and others seem to have had similar issues as well
> 
> (see HHH-1726 and http://preview.tinyurl.com/mpnz9p)
> 
>  
> 
> Kind regards
> 
> Tobias Meyer
> 
>  
> 
> 
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-- 
Steve Ebersole <steve at hibernate.org>
Hibernate.org