Jackson PrettyPrint for Spring 4

Question

The goal is to make Jackson format response from controllers with PrettyPrint. Thats my configuration for it:

@EnableWebMvc
@Configuration
public class JacksonConfig extends WebMvcConfigurerAdapter {
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        for (HttpMessageConverter<?> converter : converters) {
            if (converter instanceof MappingJackson2HttpMessageConverter) {
                MappingJackson2HttpMessageConverter jsonMessageConverter = (MappingJackson2HttpMessageConverter) converter;
                ObjectMapper objectMapper = jsonMessageConverter.getObjectMapper();
                objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
                objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
            }
        }
    }
}

Thats how a controller looks like:

@RequestMapping(value = "/facebook", method = RequestMethod.POST, produces = "application/json")
public @ResponseBody Map<String, Object> authorizeViaFacebook(
        @RequestParam(value = "token") String token) throws DefaultException{

    Facebook facebook = this.facebookUtility.getFacebook(token);
    org.springframework.social.facebook.api.User facebookUserProfile = facebook.userOperations().getUserProfile("me");

    User loggedInUser = User.signInWithFacebookProfile(facebookUserProfile);

    return ImmutableMap.of("token", loggedInUser.tokenForAuthentication(), "user", loggedInUser);
}

But no matter what I do it still prints it straight. I tried different configurations but still no success.

Here is a POM file for Jackson:

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.6.0</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.6.0</version>
    </dependency>

Spring version is 4.2.4.RELEASE.

How do I make Jackson use PrettyPrint format?

Did you make sure your browser understands application/json right? — Stefan, Jan 21 '16 at 12:59
@Stefan I use a terminal mostly. But its a good idea to check a response look in a browser. — Mehdzor, Jan 21 '16 at 13:08
@Stefan browser understand application/json correctly and still prints it in a single line. — Mehdzor, Jan 21 '16 at 13:17
Try to use objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true) instead enable — user2669657, Jan 21 '16 at 13:23
@user2669657 tried. No luck. Maybe its something with a method that I use to configure a mapper? — Mehdzor, Jan 21 '16 at 13:31
Are you sure the if instanceof returns true? I use it with overriding the method configureMessageConverters and works — user2669657, Jan 21 '16 at 14:13
@user2669657 it does for a jackson message converter. Tried to call configureMessageConverters method and creating a converter with an object mapper from scratch but still nothing. — Mehdzor, Jan 21 '16 at 14:54

score 3 · Accepted Answer · answered Jan 25 '16 at 09:04

I’ve faced a similar problem once when trying to config a Jackson’s object mapper in a Roo generated project. You need to put those snippet into webmvc-config to replace the default objectmapper with your custom one:

<mvc:annotation-driven>
   <mvc:message-converters register-defaults="false">
       <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
           <property name="objectMapper">
               <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                   <property name="objectMapper">
                       <array>
                           <bean class="com.yourproject.example.CustomObjectMapper"/>
                       </array>
                   </property>
               </bean>
           </property>
       </bean>
   </mvc:message-converters>
</mvc:annotation-driven>

Hope it helps. To be able to configure Jackson with a code based config you need setup WebApplicationInitializer You can find more info by link:http://docs.spring.io/spring/docs/4.2.x/javadoc-api/org/springframework/web/WebApplicationInitializer.html

rsinha · Answer 2 · 2018-08-18T20:10:26.233

spring-boot allows jackson configuration through spring.jackson.* properties in .properties files.

spring.jackson.serialization.indent-output=true

We can also @Autowire this configured ObjectMapper in @Components. If global configuration is not intended then objectMapper.writerWithDefaultPrettyPrinter() turns on the default indentation.

Tested with spring-boot 1.5.8.RELEASE which uses jackson-databind-2.6.5.jar.

score 1 · Answer 3 · answered Apr 29 '16 at 22:21

To add to @Jenky answer, here is example how to configure Jackson's mapper for pretty print using code approach. I'm using spring-boot-starter-1.3.3.RELEASE in this example. Simply have this class on your classpath and Spring Boot will pick it up auto-magically.

@Configuration
public class CustomWebMvcConfiguration extends WebMvcConfigurationSupport {

    @Override
    protected void extendMessageConverters( List<HttpMessageConverter<?>> converters ) {

        for ( HttpMessageConverter<?> converter : converters ) {

            if ( converter instanceof MappingJackson2HttpMessageConverter ) {

                MappingJackson2HttpMessageConverter jacksonConverter = (MappingJackson2HttpMessageConverter) converter;

                jacksonConverter.setPrettyPrint( true );

            }

        }

    }

}

Jackson PrettyPrint for Spring 4

3 Answers3

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