It maybe related to https://issues.apache.org/jira/browse/OPENJPA-542:

            return EMPTY_CLOB = (Clob) Class.forName("oracle.sql.CLOB",true, 
                    AccessController.doPrivileged(J2DoPrivHelper
                            .getContextClassLoaderAction())).
                getMethod("empty_lob", new Class[0]).
                invoke(null, new Object[0]);



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