Hol?a por -> Hol a

private String escapaCaracter(String valor) {

String valorOk = " ";
try {
      valorOk = valor
                .replaceAll("/", "-")
                .replaceAll("\\", " ")
                .replaceAll("¿", " ")
                .replaceAll("?", " ")
                .replaceAll("#", " ")
                .replaceAll("<", " ")
                .replaceAll(">", " ")
                .replaceAll("[", " ")
                .replaceAll("]", " ")
                .replaceAll("{", " ")
                .replaceAll("}", " ");
} catch (Exception e) {
    if (s_log.isLoggable(Level.FINEST)) {
        s_log.log(Level.FINEST, "Ha fallado el escapaCaracter para el valor: " + valor);
    }
}

    return valorOk;
}

java.util.regex.PatternSyntaxException: Dangling meta character '?' near index 0
?
^