[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3826) Hibernate 3.3.1.GA + Javassist issue 3.9.0.GA : java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy (OSGI Server)

[Arie van Wijngaarden (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33607#action_33607 ] 

Arie van Wijngaarden commented on HHH-3826:
-------------------------------------------

Well, I had the same problem and found the reason why:

Javassist uses for finding and constructing proxies the class loader that loaded the class to proxy. This is normally what you want, since you want to clean up the proxy when the proxied class is cleaned up as well. Very important in an OSGi environment since you want to keep your PermGen space clean.
However, in the case of hibernate, hibernate assigns an extra interface "HibernateProxy" to the proxy class. This interface must therefore also be visible to the class loader used by javassist, which is, as stated, the loader that loaded the original domain class.

If you linked up the bundles in OSGi as I did, this is probably not the situation you have: I made a separate bundle with my domain classes and the session factory that is used to store the objects in another. My domain class bundle is therefore not dependent on hibernate or javassist and therefore its class loader cannot see/find the hibernate/javassist classes needed.

A solution is of course to add the needed hibernate/javassist packages to the Import-Packages of the domain class bundle, but I do not really like that. 
Another options is to leave it as is and just ignore the failure of the proxy creation. In my situation it still works without the proxies. Maybe there is a hibernate option to just skip the whole proxy creation stuff out (don't know).

Regards,
Arie

> Hibernate 3.3.1.GA + Javassist issue 3.9.0.GA : java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy (OSGI Server)
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-3826
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3826
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.3.1
>            Reporter: Charles Moulliard
>
> Hi,
> I try to use Hibernate 3.3.1.GA in combination with Spring OSGI 1.2.0-rc1. Unfortunately, there is a classloading issue on OSGI :
> {code}
> Caused by: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy
> 	at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:174)
> 	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:162)
> 	... 58 more
> Caused by: javassist.CannotCompileException: by java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy
> 	at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:167)
> 	at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:170)
> 	... 59 more
> Caused by: java.lang.NoClassDefFoundError: org/hibernate/proxy/HibernateProxy
> 	at java.lang.ClassLoader.defineClass1(Native Method)
> 	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:159)
> 	... 60 more
> {code}
> remark : the package org.hibernate.proxy is defined in the MANIFEST file (section - Import-PAckage)

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