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

[tahura chaudhry (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30253 ] 

tahura chaudhry commented on HHH-2281:
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I'm using Spring 2.5.3 and Hibernate 3.2.1ga.jar

I'm using Spring JMX in my application and am running into the same issue.  I tried the workaround of setting "exposeManagedResourceClassLoader" property to "true" (which is the default value in 2.5.3) but that did not seem to help.

I'm wondering if there is anything else I need to do in order to get the workaround working.

thanks,

> 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
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.1
>         Environment: Hibernate checked out from trunk; revision 10717
>            Reporter: Sergey Polzunov
>            Assignee: Diego Plentz
>
> 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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