richfaces - rich:autocomplete cachedAjax firing after prefix -

i´m trying use rich:autocomplete component cachedajax mode list server after short prefix , process remain autocomplete on client, keeps firing autocompletemethod after every character after minchars param.

anyone else had problem? or maybe i´m doing somethin wrong? i´m using richfaces 4.5.3.final , xhtml , function on bean listed bellow:

xhtml

<h:form>     <h3>test cached</h3>     <rich:autocomplete mode="cachedajax" minchars="3" autocompletemethod="#{beantestelogan.doautocomplete}"/> </h:form> 

function on bean

public list<string> doautocomplete(string pattern) throws sqlexception {      list<string> listasaida = new arraylist<string>();     ...     list<pessoa> pessoas = pessoadao.findbynomelike(connection, pattern);      (pessoa pessoa : pessoas) {         listasaida.add(pessoa.getnome());     }      return listasaida; }