[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)

[Denys Kurylenko (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35703#action_35703 ] 

Denys Kurylenko commented on HHH-3826:
--------------------------------------

However I have another solution. Instead of adding hibernate/javassist packages to the Import-Packages of the domain class bundle we can just configure JavaAssist ClassLoader properly.


JavaAssist ClassLoader should be exactly the same as bundle ClassLoader that tries to instantiate LocalSessionFactoryBean.


So assume we have two modules : domain and persistence-mgr. Originally JavaAssist tries to instantiate Proxy class using domain module ClassLoader. But as [~vanwijngaarden] mentioned we won't have access to the hibernate/javaassist classes in the domain ClassLoader.

  

Utility class that sets proper classloader to the JavaAssis :

{code:title=JavaAssistHelper.java|borderStyle=solid}


import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyFactory.ClassLoaderProvider;

public class JavaAssistHelper
{
  public static ClassLoaderProvider createJavaAssistClassLoader()
  {
    ProxyFactory.classLoaderProvider = new ProxyFactory.ClassLoaderProvider()
    {
      public ClassLoader get(ProxyFactory pf)
      {
        return Thread.currentThread().getContextClassLoader();
      }
    };
    return ProxyFactory.classLoaderProvider;
  }
}

{code}

Spring configuration :

{code:xml} 
  <bean id="sessionFactory" depends-on="javaAssistClassLoader" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="datasource"/>
    <property name="configLocation" value="hibernate_cfg/hibernate.cfg.xml"/>
  </bean>

  <bean id="javaAssistClassLoader"
        class="com.*.*.JavaAssistHelper"
        factory-method="createJavaAssistClassLoader"/> 
{code}

We don't need to have any fix for this bug. It's not Hibernate bug, or bug at all.


> 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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