Force Spring-Boot to use Gson instead of Jackson

F.e. 1) to add other json artifact, if using maven and google json named gson

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>${latestGsonVersion}</version>
</dependency>

2) to set

spring.http.converters.preferred-json-mapper=gson

3) to use it in code, for instance

@Autowired private Gson gson;

There are other ones as well: Jackson Library, Google-Gson Library, JSON-lib, Flexjson, json-io, genson, JSONiJ Library.

Well, WebMvcConfigurerAdapter is deprecated. As of Spring 5.0 do this:

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Bean
    public Gson gson() {
        GsonBuilder b = new GsonBuilder();
        b.registerTypeAdapterFactory(HibernateProxyTypeAdapter.FACTORY);
        b.registerTypeAdapterFactory(DateTypeAdapter.FACTORY);
        b.registerTypeAdapterFactory(TimestampTypeAdapter.FACTORY);
        b.registerTypeAdapterFactory(LocalDateTypeAdapter.FACTORY);
        b.registerTypeAdapterFactory(LocalDateTimeTypeAdapter.FACTORY);
        return b.create();
    }

    @Override
    public void configureMessageConverters(
        List<HttpMessageConverter<?>> converters) {
        StringHttpMessageConverter stringConverter = new StringHttpMessageConverter();
        stringConverter.setWriteAcceptCharset(false);
        stringConverter.setSupportedMediaTypes(Collections
            .singletonList(MediaType.TEXT_PLAIN));
        converters.add(stringConverter);
        converters.add(new ByteArrayHttpMessageConverter());
        converters.add(new SourceHttpMessageConverter<>());
        GsonHttpMessageConverter gsonHttpMessageConverter = new GsonHttpMessageConverter();
        gsonHttpMessageConverter.setGson(gson());
        gsonHttpMessageConverter.setSupportedMediaTypes(Arrays
            .asList(MediaType.APPLICATION_JSON));
        converters.add(gsonHttpMessageConverter);
    }
}