Erro ao usar JavaComm

public class Main {
    Enumeration listaDePortas;
    listaDePortas = CommPortIdentifier.getPortIdentifiers();
    
    int i = 0;
    portas = new String[10];
    while (listaDePortas.hasMoreElements()) {
    CommPortIdentifier ips =
    (CommPortIdentifier)listaDePortas.nextElement();
    portas[i] = ips.getName();
    i++;
    }
}