How to use

getCause

method

in

java.security.InvalidKeyException

public Hmac(String algorithm, SecretKey secretKey) {
  try {
    this.hmac = Mac.getInstance(algorithm);
    this.hmac.init(secretKey);
  } catch (NoSuchAlgorithmException e) {
    throw new RuntimeException("Algorithm not supported: " + algorithm);
  } catch (InvalidKeyException e) {
    throw new RuntimeException("Invalid key: " + e.getCause());
  }
}

     + " Cause: %s", e.getCause().toString());
 LOG.error(errString);
} catch (StorageException e) {