问使用Spring integration DSL在我的errorChannel中出现任何错误时发送电子邮件

EN

@Transformer(inputChannel="errorChannel", outputChannel="suspendChannel")
public Message<?> errorChannelHandler(ErrorMessage errorMessage) throws RuntimeException, MessagingException, InterruptedException {

Exception exception = (Exception) errorMessage.getPayload();
    String errorMsg = errorMessage.toString();
    String subject = "API issue";
    if (exception instanceof RuntimeException) {
        errorMsg = "Run time exception";
        subject = "Critical Alert";
    }
    if (exception instanceof JsonParseException) {
        errorMsg = ....;
        subject = .....;
    }

    MimeMessage message = sender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(message);
    helper.setFrom(senderEmail);
    helper.setTo(receiverEmail);
    helper.setText(errorMsg);
    helper.setSubject(subject);
    sender.send(message);
    kafkaProducerSwitch.isKafkaDown());
    return MessageBuilder.withPayload(exception.getMessage())

            .build();
}