[FIXED] Jackson is ignoring spring.jackson.properties in my spring boot application

Issue

Jackson is ignoring spring.jackson.property-naming-strategy=SNAKE_CASE. I am using springBootVersion 1.4.2.RELEASE. In my application.properties file, I have added

spring.jackson.property-naming-strategy=SNAKE_CASE

But Jackson is not honoring this property, and my REST response is still camelCase. Interestingly, this annotation works just fine

@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)

With this annotation, I am getting snake_case response. But I don't want to annotate each response class, it's a bit annoying.

Edit

I tried using fully qualified class name as well,

spring.jackson.property-naming-strategy=com.fasterxml.jackson.databind.PropertyNamingStrategy.SnakeCaseStrategy

that did not work either

Solution

I had @EnableWebMvc annotation in one of the classes (ExceptionHandler) in my Application (face-palm!).

But, as per this issue,

If you have @EnableWebMvc annotation, that disables the auto-configuration of Spring MVC, including the configuring of its message converters to customize Jackson's serialization.

It's expected behavior when you use @EnableWebMvc as, by doing so, you're telling Spring Boot that you want to take control of Spring MVC's configuration. That includes configuring its HTTP message converters to (de)serialize JSON in the manner that meets your needs.

If you want to override the Jackson configuration, you can either use the spring.jackson.* properties or, if you want more control, declare your own Jackson2ObjectMapperBuilder bean.

Once I removed @EnableWebMvc annotation, this property works as expected.

Answered By - so-random-dude