How get original message after get an errorHandler and write a file - email

Question

I've been building a Spring integration Service Email using Java DSL.
This service must have a recovery policy in order to retry sending the emails but I'm not getting success.
A brief story: The application recieve a Payload and Header and try to send to email server. It tries 3 times and in case of failure, it creates a new file with Header and Body of message.
How could I get the original Message(Header and Payload) and put the information pair in a json file, in case of failure to send the email?
Thanks.
This is my beans and the service:
/**
* #################
* MESSAGE ENDPOINTS
* #################
*/
#Bean(name = PollerMetadata.DEFAULT_POLLER)
public PollerMetadata poller() {
return Pollers
.fixedRate(NumberUtils.createLong(QUEUE_RATE))
.maxMessagesPerPoll(NumberUtils.createLong(QUEUE_CAPACITY))
.errorHandler(e -> LOG.error("Exception : " + e.getMessage()))
.get();
}
#Bean
public MessageChannel recoveryChannel() {
return MessageChannels.direct().get();
}
#MessagingGateway
public static interface MailService {
#Gateway(requestChannel = "mail.input")
void sendMail(String body, #Headers Map<String,String> headers);
}
#Bean
public RetryPolicy retryPolicy() {
final Map<Class<? extends Throwable>, Boolean> map =
new HashMap<Class<? extends Throwable>, Boolean>() {
{
put(MailSendException.class,true);
put(RuntimeException.class, true);
}
private static final long serialVersionUID = -1L;
};
final RetryPolicy ret = new SimpleRetryPolicy(3, map, true);
return ret;
}
#Bean
public RetryTemplate retryTemplate() {
final RetryTemplate ret = new RetryTemplate();
ret.setRetryPolicy(retryPolicy());
ret.setThrowLastExceptionOnExhausted(false);
return ret;
}
#Bean
public Advice retryAdvice() {
final RequestHandlerRetryAdvice advice = new RequestHandlerRetryAdvice();
advice.setRetryTemplate(retryTemplate());
RecoveryCallback<Object> recoveryCallBack = new ErrorMessageSendingRecoverer(recoveryChannel());
advice.setRecoveryCallback(recoveryCallBack);
return advice;
}
private MailSendingMessageHandlerSpec mailOutboundAdapter(){
MailSendingMessageHandlerSpec msmhs =
Mail.outboundAdapter(emailServerHost())
.port(serverPort())
.credentials(MAIL_USER_NAME, MAIL_PASSWORD)
.protocol(emailProtocol())
.javaMailProperties(p -> p
.put("mail.debug", "true")
.put("mail.smtp.ssl.enable",enableSSL())
.put("mail.smtp.connectiontimeout", 5000)
.put("mail.smtp.timeout", 5000));
return msmhs;
}
#Bean
public FileWritingMessageHandler fileOutboundAdapter(){
FileWritingMessageHandler fwmhs = Files
.outboundAdapter(new File("logs/errors/"))
.autoCreateDirectory(true)
.get();
return fwmhs;
}
/**
* ################
* FLOWS
* ################
*/
#Bean
public IntegrationFlow smtp(){
return IntegrationFlows.from("mail.input")
.channel(MessageChannels.queue())
.handle(this.mailOutboundAdapter(),
e -> e.id("smtpOut")
.advice(retryAdvice())
)
.get();
}
#Bean
public IntegrationFlow errorFlow(){
return IntegrationFlows.from(recoveryChannel())
.transform(Transformers.toJson())
.enrichHeaders(c -> c.header(FileHeaders.FILENAME, "emailErrors"))
.handle(this.fileOutboundAdapter())
.get();
}
}

Answer 1

The error message has a payload MessagingException. It has two properties cause and failedMessage.
The failed message is the message at the point of failure, with headers and payload.