Java Process.getInputStream () is not reading accented characters

I want to run a python script using the Process class and display its output. However Java is printing the characters accented like a diamond with a question mark inside.

ProcessBuilder processBuilder = new ProcessBuilder(command.split(" "));
processBuilder.directory(workingDirectory);
Process process = processBuilder.start();
try {
    BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    String output;
    while ((output = reader.readLine()) != null) System.out.println(output);
    reader.close();
} catch (IOException e) {
    e.printStackTrace();
}

How do I solve this problem? If possible platform-independent.