CODEWITHSUNDEEP
javaspring-bootjacksongson
Zeph
Zeph

Reputation: 3

Springboot 1.5.1 migrate to 2.0.1 Instance format

I want to migrate my springboot project from 1.5.1 to 2.0.1.

But the Instant format are different when I return the model in RestController.

Return object:

public class Message {
     private Instant instant;

}

In 1.5.1: 

{
    "instant": {
         "epochSecond": 1537263091,
         "nano": 557000000
    }
}

In 2.0.1:

{
     "instant": "2018-09-18T09:46:02.646Z"
}

How can I get this one { "instant": { "epochSecond": 1537263091, "nano": 557000000 } } when I use 2.0.1?

Upvotes: 0

Views: 163

Answers (1)

Brother
Brother

Reputation: 2220

You could probably set this operation on your application.properties:

spring.jackson.serialization.write_dates_as_timestamps=false

On the migration, if you added any of the following dependencies, try removing it:

jackson-modules-java8
jackson-datatype-jsr310

[UPDATED]

Another way, you could write a serializer for Instant:

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.time.Instant;

public class CustomInstantSerializer extends JsonSerializer<Instant> {

    @Override
    public void serialize(Instant o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeObject(new EpochInstant(o));
    }

    public static class EpochInstant {

        private final long epochSecond;
        private final int nano;

        EpochInstant(Instant instant) {
            this.epochSecond = instant.getEpochSecond();
            this.nano = instant.getNano();
        }
    }
}

And have a Configuration class, setting the Instant to use your serializer:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import java.time.Instant;

@Configuration
public class JacksonConfiguration {

    @Bean
    @Primary
    public ObjectMapper objectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(Instant.class, new CustomInstantSerializer());

        return objectMapper;
    }
}

Upvotes: 2

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