timestamp in SQS message can't be converted in spring boot - spring-boot

Question

I created a DTO to map message came from AWS SES to SQS through SNS but the timestamp converter didn't work properly with objectMapper created by spring boot. I tried to map the timestamp with (ZonedDateTime/ LocalDateTime / Instant) and I always get an error
I used these versions
spring-boot version is 2.2.5
spring-cloud version is Hoxton.SR3
I explicitly specify Jackson version to be 2.9
here is the message
{
"notificationType": "Bounce",
"bounce": {
"bounceType": "Permanent",
"bounceSubType": "Suppressed",
"bouncedRecipients": [
{
"emailAddress": "blacklist#simulator.amazonses.com",
"action": "failed",
"status": "5.1.1",
"diagnosticCode": "Amazon SES has suppressed sending to this address because it has a recent history of bouncing as an invalid address. For more information about how to remove an address from the suppression list, see the Amazon SES Developer Guide: http://docs.aws.amazon.com/ses/latest/DeveloperGuide/remove-from-suppressionlist.html "
}
],
"timestamp": "2020-03-20T21:00:42.217Z",
"feedbackId": "01070170f9bf8131-9cbe20b1-7997-4d33-8e02-7e828eb01edc-000000",
"reportingMTA": "dns; amazonses.com"
},
"mail": {
"timestamp": "2020-03-20T21:00:42.217Z",
"source": "tester#####.com",
"sourceArn": "arn:aws:ses:eu-central-1:425905684163:identity/####",
"sourceIp": "54.239.6.46",
"sendingAccountId": "425905684163",
"messageId": "01070170f9bf8091-79e59712-3c2d-424c-9eba-3e221ef336ff-000000",
"destination": [
"blacklist#simulator.amazonses.com"
],
"headersTruncated": false,
"headers": [
{
"name": "From",
"value": "tester#####.com"
},
{
"name": "To",
"value": "blacklist#simulator.amazonses.com"
},
{
"name": "Subject",
"value": "lkasnlkaslknaslkn"
},
{
"name": "MIME-Version",
"value": "1.0"
},
{
"name": "Content-Type",
"value": "text/plain; charset=UTF-8"
},
{
"name": "Content-Transfer-Encoding",
"value": "7bit"
}
],
"commonHeaders": {
"from": [
"*****"
],
"to": [
"blacklist#simulator.amazonses.com"
],
"subject": "lkasnlkaslknaslkn"
}
}
}
The mapping for the bounce object is
#Data
#AllArgsConstructor
#NoArgsConstructor
#Builder
#JsonInclude(JsonInclude.Include.NON_EMPTY)
public class Bounce {
private BounceType bounceType;
private BounceSubType bounceSubType;
private List<Recipient> bouncedRecipients;
private ZonedDateTime timestamp;
private String feedbackId;
private String remoteMtaIp;
private String reportingMTA;
public static enum BounceType {
Permanent, Transient
}
public static enum BounceSubType {
General, Suppressed
}
}

Answer 1

jackson-modules-java8 can do that. This works for me:
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JavaTimeModule());
String message = "{ \"timestamp\": \"2020-03-20T21:00:42.217Z\" }";
Dto obj = mapper.readValue(message, Dto.class);
System.out.println(obj.getTimestamp());
Output is (as you may have expected):
2020-03-20T21:00:42.217Z
Note that I am explicitly registering the Jackson java.time module on the mapper. If you were to use the mapper for serialization too, you would additionally need:
mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
For the sake of a complete example, The Dto class I was using is very simple, just a field with getter and setter:
public class Dto {
    private Instant timestamp;
    public Instant getTimestamp() {
        return timestamp;
    }
    public void setTimestamp(Instant timestamp) {
        this.timestamp = timestamp;
    }
}
I did not try with a field of type ZonedDateTime nor OffsetDateTime, but I’d be very surprised if they didn’t work too. In any case, if your timestamp is always in UTC and always has the trailing Z for UTC, then I would consider Instant the most correct type for it in Java.
Link
jackson-modules-java8