getBytes() 在 Windows (Java9) 下按预期工作，在 Linux 下也不工作

Question

Method getBytes() works as expected under Windows (Java9) and does nor works under Linux. Characterset() => UTF-8 on both systems. JVM Version => Java 9 (I tested open jvm and oracle jvm under Linux)
Code:

public static String createSign(String uri, String apiSecret) throws UnsupportedEncodingException{
    byte[] signBytes = calculateSignBytes(uri, apiSecret);
    return bytesToHexString(signBytes);
}

private static byte[] calculateSignBytes(String uri, String secret) throws UnsupportedEncodingException {

    try {
        Mac mac = Mac.getInstance(ALGORITHM);
        SecretKeySpec secretKeySpec = new SecretKeySpec(secret.getBytes(), ALGORITHM);
        mac.init(secretKeySpec);
        return mac.doFinal(uri.getBytes());
    } catch (NoSuchAlgorithmException | InvalidKeyException e) {
        throw new RuntimeException(e);
    }
}

private static String bytesToHexString(byte[] bytes){
    StringBuilder stringBuilder = new StringBuilder();
    for (byte b : bytes) {
        stringBuilder.append(String.format("%02x", b));
    }
    return stringBuilder.toString();
}

the same under Windows and Linux. I also tested compiling and export executable JAR under windows and rut it on Linux, all functionality works fine except code above.

Answer 1

Please remember always use the charset, this avoid unexpected results.

new SecretKeySpec(secret.getBytes ( Charsets.UTF_8 ), ALGORITHM)