Default configuration of AbstractMessageChannelMessagingSendingTemplate leads to Jackson error: "Could not write JSON: Java 8 date/time type java.time.Instant not supported by default"

[zachzientek]

Type: Bug

Component: SNS

Describe the bug
Using Spring Cloud AWS 2.4.1, Spring Cloud 2021.0.2, and Spring Boot 2.7.0.
This issue is similar to a previous issue with SQS (#217) but occurs when trying to send SNS messages (NotificationMessagingTemplate.convertAndSend) that contains fields of Java date/time types. It leads to the following Jackson error:
"Could not write JSON: Java 8 date/time type java.time.Instant not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling". Adding JSR310 dependency to the classpath does not resolve this issue.

[maciejwalkowiak]

When creating NotificationMessagingTemplate, you can pass custom MessageConverter which can be an instance of MappingJackson2MessageConverter configured with ObjectMapper supporting JSR 310 modules.

[zachzientek]

Thanks for the feedback. Yeah, I figured out the workaround as you mentioned. I wasn't sure if it was intentional that the Spring configured ObjectMapper wasn't being used and especially that Java 8 time support isn't included by default.

[maciejwalkowiak]

Thanks for coming back.

In 3.0 SNS auto-configuration creates SnsTemplate with provided ObjectMapper (https://github.com/awspring/spring-cloud-aws/blob/main/spring-cloud-aws-autoconfigure/src/main/java/io/awspring/cloud/autoconfigure/sns/SnsAutoConfiguration.java#L71). We do not have plans to change that for 2.4.x.