Looking at this code and the error message, I believe that the error message has nothing to do with the code, but rather that the junit task within ant is incorrect. As a guess, I suspect that the Client.class file is in the wrong location relative to the classpath - the error seems to say that it found Client.class in a base directory rather than within the com/ip6networks/calling_card_registration/test/ directory. If the above does not help you, please post the full target that include the junit task. When posting that, please enclose it within 'code' tags - select the XML text and click the Code button above the editor window. Also, use the Preview button to ensure proper formatting before clicking Submit. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4243844#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...