The path I put in the FileReader to read the file would be correct, since it does not stop going to the FileNotFoundException with the method in the logical package and the document in Files all within the src.
BufferedReader fichero = new BufferedReader(new FileReader("Files/clientes.dat"));
while (fichero.ready()) {
linea = fichero.readLine();
String[] trozos = linea.split("@");
if(trozos[0] == usuarioCliente) { //El Cliente ya esta Registrado
return true;
}
Greetings and thank you very much.