consuming webservice java

consuming webservice java

hey everybody !
and this code:

  1. $.ajax({
  2. type: "POST",
  3. url: "http://www.safetrace.com.br/safefrigorifico/services/ServicoConsulta.jws/consultarDadosRequest",
  4. data: "{}",
  5. contentType: "application/json; charset=utf-8",
  6. dataType: "json",
  7. success: function(data) {
  8.   alert(data.d);
  9. },
  10. error: function(){
  11.   alert("erro");
  12. }
  13. });

but I just get "erro" .. this is the first time that I'm working with webservice .. I search a lot of tutorials .. but does not work! =/