How to Serialize ZonedDateTime in ISO Format with Spring Data JPA and Jackson?

Spring Data JPA - Serializing ZonedDateTime as ISO Format

When working with ZonedDateTime in Spring Data JPA, its JSON serialization can lead to excessive data transfer. To mitigate this issue, let's explore how to format ZonedDateTime to ISO format for efficient serialization.

Solution Using Jackson Module for Java 8 Date Time API

To effectively handle ZonedDateTime serialization, install the Jackson module for Java 8 Date Time API.

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.6.0</version>
</dependency>

Utilize the module as follows:

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JavaTimeModule());

Within your Entity class:

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSZ")
public ZonedDateTime getTime() {
    return time;
}

This will format the ZonedDateTime to ISO format during JSON serialization.

Note for Jackson Version 2.4.x

If you're using Jackson 2.4.x, replace the registration line with:

objectMapper.registerModule(new JSR310Module());

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