Servlet não encontrado

private URLConnection getConnection() throws IOException
  {
    String conexaoServlet = "http://localhost:8080/CilindroSecador/Acesso";
    URL u = new URL(conexaoServlet);
    URLConnection con = u.openConnection();
    con.setDoInput(true);
    con.setDoOutput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-type","application/octet-stream");
    con.setAllowUserInteraction(false);
    return con;

  }

private void sendObject (URLConnection con, Object obj) throws IOException
  {
    ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream());
    if (obj != null){
      out.writeObject(obj);
    }
      out.close();
    }

private Object receiveObject(URLConnection con) throws Exception
 {
   ObjectInputStream in = new ObjectInputStream (con.getInputStream());
   Object obj = in.readObject();
   return obj;
 }

void loginBotao_actionPerformed(ActionEvent e) {
      try {
          URLConnection con = getConnection();
          sendObject(con, Conect);
          String c = (String)receiveObject(con);
          }
       }
       catch ( Exception ex ) {
       System.err.println( "Não Foi Possível a Conexão" + ex );
         }
}

public class Acesso extends HttpServlet {
  private Connection connection;

  public String Conecta(String c) {
  String conecta = "";
    try{
       Class.forName("com.mysql.jdbc.Driver").newInstance();
       connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/cilindrosecador?user=angelo");
       c = "true";

     }
    catch ( SQLException sqlex ) {
       System.err.println( "Não Foi Possível a Conexão Servlet" );
       sqlex.printStackTrace();
          }
       catch (ClassNotFoundException ex) {
          //loginDisplay.setText("ClassNotFoundException");
       }
       catch (IllegalAccessException ex1) {
         // loginDisplay.setText("IllegalAccessException");
       }
       catch (InstantiationException ex1) {
         // loginDisplay.setText("InstantiationException");
       }

    return (c);
  }


  private Object receiveObject(HttpServletRequest req) throws Exception
  {
    ObjectInputStream in =new ObjectInputStream(req.getInputStream());
    Object obj = in.readObject();
    in.close();
    return obj;
 }

private void sendObject(HttpServletResponse resp, Object obj) throws
      IOException {
   ObjectOutputStream out = new ObjectOutputStream(resp.getOutputStream());
   out.writeObject(obj);
   out.close();
 }

  public void doPost(HttpServletRequest req, HttpServletResponse resp)
  {
  try{
    Object obj = receiveObject(req);
    String c = (String)obj;
    Conecta(c);
    sendObject(resp, c);
  }
  catch(Exception e){
   System.err.println( e );
  }
  }

}