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

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 Affects 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.