B4J Question send and data from B4j app to Java Servlet ?

    Dim j As HttpJob
    j.Initialize("send_data", Me) 

    Dim sData As String    =    "send data to server from client"
    LogError("lenght string = " & sData.Length)

    j.PostString("http://localhost:8080/devagonsit/servlet/ServletSynchro?name=pippo&city=milan", sData)
    
    Wait For (j) JobDone(j As HttpJob)
    
    If j.Success Then
        
        Log("chiamata avvenuta con successo x invio bytes")
        
        j.Release
        
    Else
        LogError("Chiamata servelet fallita")
    End If

  ServletInputStream is     = request.getInputStream();
          BufferedReader br         = null;
          StringBuilder stringBuilder = new StringBuilder(); 
          
          out.println("len buffer " + request.getContentLength());
          
          if (is != null) { 
              BufferedReader bufferedReader  = new BufferedReader(new InputStreamReader(is)); 

                char[] charBuffer = new char[128]; 
                int bytesRead = -1; 

                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) { 
                    stringBuilder.append(charBuffer, 0, bytesRead); 
                } 
          
                out.println("lettura dati dal client " + stringBuilder.toString());
          }
          
          out.println("fine della lettura dei dati....");