hi this might just be your typo but isnt url: "/AddNewClient" suppose to be url: "/AddNewClient.do" or .action?
first of all, since your using ajax and it shouldnt have anything to do with form, so just to be on the save side i would change your button from type="submit" to type="button" since you dont really want to submit the form after all. one thing i noticed is that the "data" attribute. isnt it suppose to be a javascript Object? and not a string? you can simply do var data = {'loginClient' : loginClient, 'passwordClientError' : passwordClientError,'passwordClient2' :passwordClient2 } $.ajax({ type: "POST", url: "AddNewClient.do", data: data, success: function() { $('#Great').html('Great It\'s Done'); } }); // alert (dataString); return false; }); }); try these changes and see if you get anything