Oleg, Thanks for responding. The code is as follows where conn is a Connection returned from a call to getConnection() on a Datasource from a remote server to my client application using JNDI lookup: DatabaseMetaData dbMeta = conn.getMetaData(); ... try { tableRes = dbMeta.getTables(null, null, null, types); } catch (Exception e) { System.out.println(e); e.printStackTrace(System.err); } The types variable is an array of strings with values TABLE, VIEW, SYNONYM. As you can see I do not do any casting. It is the getTables(...) method that throws the exception. If you would like I can expose the datasource file here. It appears to me there is a problem with the proxy used to wrap the DatabaseMetaData and it is a problem when the datasource is to an Oracle database using the thin client driver. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960842#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...