Configure MappingJackson2MessageConverter's ObjectMapper

Mel — Mon, 07 Sep 2020 16:40:58 +0000

In our service, we are expecting a ZonedDateTime data type from a queue (AWS SQS) message (that is subscribed to a AWS SNS) to be mapped in our POJO.

I kept getting this error

Caused by: org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot construct instance of `java.time.ZonedDateTime` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('2020-09-07T18:02:51.099+0000')

I thought that the solution was to override the ObjectMapper to be able to register the module JavaTimeModule so the message could be deserialized.
The solution was right but it still didn't solve the error.
I came to a realization (by the help of my coworker) that since we're using Spring Cloud to receive the message from the queue, messages that are received are handled by MappingJackson2MessageConverter.
https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/jms/support/converter/MappingJackson2MessageConverter.html

The solution was to configure the MappingJackson2MessageConverter's object mapper (see to it that your ObjectMapper has a JavaTimeModule), and set other configurations as well.

@Bean
public MappingJackson2MessageConverter mappingJackson2MessageConverter(ObjectMapper objectMapper) {
    MappingJackson2MessageConverter jacksonMessageConverter = new MappingJackson2MessageConverter();
    jacksonMessageConverter.setObjectMapper(objectMapper);
    jacksonMessageConverter.setSerializedPayloadClass(String.class);
    jacksonMessageConverter.setStrictContentTypeMatch(true);
    return jacksonMessageConverter;
}

Hope this post helped you in any way!

Blog for a back-end developer's portfolio?

Mel — Mon, 07 Sep 2020 12:13:36 +0000

Recently, I've noticed that most job postings require portfolios even if they're looking for back-end developers.
So I thought... maybe I should start creating a public GitHub account to use it as my portfolio as a Software Engineer.

But for me, it still doesn't make sense. I still need to make a front-end side for my back-end code and honestly, I'm not that good in front-end (no offense, Angular). I know a little Angular but I'm more interested on what happens on the back-end of every click of a user.

I saw a post somewhere (or was it a discord message? :think:) that maybe a blog will be a great portfolio for a back-end developer.

I'm no writer, and I'm not an expert at any language. This account is just made to document any random experience that I think would help other people in this community.

Thank you!

DEV Community: Mel

Configure MappingJackson2MessageConverter's ObjectMapper

Blog for a back-end developer's portfolio?