How to use

addSuppressed

method

in

javax.mail.MessagingException

/**
 * Try to attach a suppressed exception to a MessagingException in any order
 * that is possible.
 * @param required the exception expected to see as a reported failure.
 * @param optional the suppressed exception.
 * @return either the required or the optional exception.
 */
private static MessagingException attach(
    MessagingException required, Exception optional) {
  if (optional != null && !required.setNextException(optional)) {
    if (optional instanceof MessagingException) {
      final MessagingException head = (MessagingException) optional;
      if (head.setNextException(required)) {
        return head;
      }
    }
    if (optional != required) {
      required.addSuppressed(optional);
    }
  }
  return required;
}

/**
 * Try to attach a suppressed exception to a MessagingException in any order
 * that is possible.
 * @param required the exception expected to see as a reported failure.
 * @param optional the suppressed exception.
 * @return either the required or the optional exception.
 */
private static MessagingException attach(
    MessagingException required, Exception optional) {
  if (optional != null && !required.setNextException(optional)) {
    if (optional instanceof MessagingException) {
      final MessagingException head = (MessagingException) optional;
      if (head.setNextException(required)) {
        return head;
      }
    }
    if (optional != required) {
      required.addSuppressed(optional);
    }
  }
  return required;
}

/**
 * Try to attach a suppressed exception to a MessagingException in any order
 * that is possible.
 * @param required the exception expected to see as a reported failure.
 * @param optional the suppressed exception.
 * @return either the required or the optional exception.
 */
private static MessagingException attach(
    MessagingException required, Exception optional) {
  if (optional != null && !required.setNextException(optional)) {
    if (optional instanceof MessagingException) {
      final MessagingException head = (MessagingException) optional;
      if (head.setNextException(required)) {
        return head;
      }
    }
    if (optional != required) {
      required.addSuppressed(optional);
    }
  }
  return required;
}

/**
 * Try to attach a suppressed exception to a MessagingException in any order
 * that is possible.
 * @param required the exception expected to see as a reported failure.
 * @param optional the suppressed exception.
 * @return either the required or the optional exception.
 */
private static MessagingException attach(
    MessagingException required, Exception optional) {
  if (optional != null && !required.setNextException(optional)) {
    if (optional instanceof MessagingException) {
      final MessagingException head = (MessagingException) optional;
      if (head.setNextException(required)) {
        return head;
      }
    }
    if (optional != required) {
      required.addSuppressed(optional);
    }
  }
  return required;
}

/**
 * Try to attach a suppressed exception to a MessagingException in any order
 * that is possible.
 * @param required the exception expected to see as a reported failure.
 * @param optional the suppressed exception.
 * @return either the required or the optional exception.
 */
private static MessagingException attach(
    MessagingException required, Exception optional) {
  if (optional != null && !required.setNextException(optional)) {
    if (optional instanceof MessagingException) {
      final MessagingException head = (MessagingException) optional;
      if (head.setNextException(required)) {
        return head;
      }
    }
    if (optional != required) {
      required.addSuppressed(optional);
    }
  }
  return required;
}