RMI + Exception + Applet

Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
	at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
	at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
	at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
	at javax.naming.InitialContext.rebind(Unknown Source)
	at ProdutoServidor.main(ProdutoServidor.java:22)

import javax.naming.Context;
import javax.naming.InitialContext;

import java.net.MalformedURLException;
import java.rmi.RemoteException;
import javax.naming.NamingException;

/**
 * Classe servidora de métodos para objetos remotos.
 */
public class ProdutoServidor {
   public static void main(String[] args) throws RemoteException,
                                                 MalformedURLException,
                                                 NamingException {
      System.out.println("Criando objetos...");
      ProdutoImpl p1 = new ProdutoImpl("Pen Drive LG 256MB");
      ProdutoImpl p2 = new ProdutoImpl("HD Maxtor 60GB");

      System.out.println("Publicando objetos no Servico de Nomes...");
      InitialContext initialContext = new InitialContext();
      initialContext.rebind("pen_drive",p1);
      initialContext.rebind("hd_maxtor",p2);

      System.out.println("Aguardando pedidos de clientes...");
   } // public static void main(String[]) throws RemoteException, ...
} // public class ProdutoServidor