Spring mvc : Changing default Response format from xml to json

Question

I have gone through other similar asked questions but nothing worked for me.

All my API\'s return JSON as response by Default:

Answer 1

In general if you want to get json response you need an jackson-databind module:

 
    com.fasterxml.jackson.core 
    jackson-databind 
    ${json-jackson-version} 
 

and then you have to define a MappingJackson2HttpMessageConverter in your configuration:

@Configuration
@EnableWebMvc
public class WebAppMainConfiguration extends WebMvcConfigurerAdapter {

    @Override 
    public void configureMessageConverters(List> converters) { 
        converters.add(new MappingJackson2HttpMessageConverter());

        [..] 
        super.configureMessageConverters(converters); 
    }

    [...]
}

In your case, you can implement your own AbstractGenericHttpMessageConverter so you can switch in this converter between different concrete converters depending on media type.

Check the method AbstractGenericHttpMessageConverter#writeInternal(..)