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

[Sergey Polzunov (JIRA)]

CLONE -Calling Session.connection() generates java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not visible from class loader
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         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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