I do not think it is possible to find the the best way for this stuff, but we expected hibernate (and cglib) classes will be in the same or in the parent classloader (asumption is based on j2ee container class loading stuff). It must be better to use this asumption, it has more chances to be maintained.
--- "Ivan S. Dubrov" <[EMAIL PROTECTED]> wrote: > > > >cant see your attachement (at netcafe ,), but im > quite sure this is not the right solution to this > *eclipse* problem ,) > > > >And I cant recall having this issue when installing > own classloader. > > > >you should go to eclipse and look for the bug > talking about buddy classloading which can handle > >this via eclipse classloader madness. > > > >max > > No. This is not bug. I understand all Eclipse > classloaders "madness". This is feature :) > > I'll try to describe it again. I do not want make my > entity classes "see" hibernate jar's (because I want > to support pluggable persistence layers, for example > via Hibernate or via JDBC, etc). Saying it another > way, classloader of mine entity classes do not see > hibernate classes - I just _want_ it to be this way. > But when Hibernate generates proxy factory, it uses > default Enhancer "create" method, look at the > snippet: > > return (Factory) Enhancer.create( > (interfaces.length==1) ? > persistentClass : null, > interfaces, > NULL_METHOD_INTERCEPTOR > ); > > If you look into the Enhancer source code, you'll > see that if classloader was not set explicitly it > uses superclass (the class that will be used as > superclass for generated proxy) classloader. And the > superclass in this case is mine entity class. So > CGLib tries to generate proxy using my entity > classloader. But interfaces array contains > HibernateProxy interface, and this is class from > Hibernate jar, so it is not seen from my entity > classloader (this is by desire). So CGLib fails to > generate proxy (with an exception of > ClassNotFoundException). > > That's the problem. I've solved it very simple - in > case of CodeGenerationException thrown from the > Enhancer.create(), I call Enhancer again, but with > classloader explicitly set to the > Thread.currentThread().getContextClassLoader(). I > think this is OK, since ReflectHelper already uses > thread context classloader to load entities (that's > why my entity is loaded by the Hibernate > successfully, despite the fact that it is in the > different classloader than Hibernate itself). > > I think the current behaviour of Hibernate is > inconsistent - it can load entity classes from > unrelated classloader (using the thread context > classloader), but it fails to generate proxies for > them (since it requires classloader of entity > classes to see HibernateProxy class). > > The better way, of course, will be the ability to > pass Hibernate classloader that will be used both > for loading entity and generating proxy for it. > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: NEC IT Guy Games. > How far can you shotput > a projector? How fast can you ride your desk chair > down the office luge track? > If you want to score the big prize, get to know the > little guy. > Play to win an NEC 61" plasma display: > http://www.necitguy.com/?r=20 > _______________________________________________ > hibernate-devel mailing list > hibernate-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/hibernate-devel > __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. http://promotions.yahoo.com/new_mail ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
