[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3529) ConnectionWrapper is not visible from class loader

[hugo lassiège (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33671#action_33671 ] 

hugo lassiège commented on HHH-3529:
------------------------------------

You have to build hibernate from svn source. However, unfornately you will have to maintain this fork of hibernate in your enterprise repository until it is fixed by hibernate itself. 

Otherwise you can try an AOP solution and change the class loader before the call to the service, this is not an elegant solution but you don't have to maintain a hibernate patch. 



> ConnectionWrapper is not visible from class loader 
> ---------------------------------------------------
>
>                 Key: HHH-3529
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3529
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.6, 3.3.1
>         Environment: SpringFramework 2.5.5, Hibernate 3.2.6 / 3.3.1, Tomcat 5.5, CommonJ Timer ( http://www.myfoo.de/commonj/ )
>            Reporter: Vladimir Kralik
>         Attachments: hibernate-3.2.6_p2.patch
>
>
> Hibernate/Spring libraries are in app.war/WEB-INF/lib.
> Timer is configured as resources in Tomcat and his libraries are in $CATALINA_HOME/common/lib/.
> Function call from GUI works, but the same function called by timers gives this exception :
> org.springframework.transaction.CannotCreateTransactionException: Could not openHibernate Session for transaction; nested exception is java.lang.IllegalArgumentException:
>   interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
>         at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:599)
> ....
> Caused by: java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
>         at java.lang.reflect.Proxy.getProxyClass(Proxy.java:353)
>         at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581)
>         at org.hibernate.jdbc.BorrowedConnectionProxy.generateProxy(BorrowedConnectionProxy.java:67)
>         at org.hibernate.jdbc.ConnectionManager.borrowConnection(ConnectionManager.java:163)
>         at org.hibernate.jdbc.JDBCContext.borrowConnection(JDBCContext.java:111)
>         at org.hibernate.impl.SessionImpl.connection(SessionImpl.java:359)
>         at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:510)
> It's the same bug as was in HHH-2215, but this is not resolved.
> I think, that the problem is extracting classloader from currentThread(). This is always not null, so the next test in method getProxyClassLoader() is always false.  
> I my case, timer thread lives in top class loader, but hibernate libraries are inside application class loader.
> Attached patch removes classloader extracting  from currentThread(). It works for my case.

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