[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2281) CLONE -Calling Session.connection() generates java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader

[Sergey Polzunov (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2281?page=comments#action_25553 ] 

Sergey Polzunov commented on HHH-2281:
--------------------------------------

I've got such problem trying to manage application via JMX methods.

Calling "Connection con = session.connection();" in HibernateTransactionManager generates  "java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader " as above.

i trying to invoke method that communicate with my database using simple method in JMX-bean

> CLONE -Calling Session.connection() generates java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>          Key: HHH-2281
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2281
>      Project: Hibernate3
>         Type: Bug

>     Versions: 3.2.1
>  Environment: Hibernate checked out from trunk; revision 10717
>     Reporter: Sergey Polzunov

>
>
> Calling Session.connection() always generates an exception. Here is the stacktrace I get from the attached test case:
> Exception in thread "main" 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:56)
> 	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 TestSession.main(TestSession.java:16)
> Changing the Connection.class.getClassLoader() to BorrowedConnectionProxy.class.getClassLoader() on line 57 in the generateProxy() method solves the problem. I am not very familiar with class loaders so I don't know if this is likeley to cause other problems elsewhere. Removing the ConnectionWrapper.class from the PROXY_INTERFACES array in the org.hibernate.jdbc.BorrowedConnectionProxy also solves the problem, but I guess it was added for a reason.

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