CODEWITHSUNDEEP
javaspring-bootrestjackson
Remo
Remo

Reputation: 604

How Jackson taking module beans automatically?

I am having below class

@SpringBootApplication
public class TestApplication {

    public static void main(final String[] args) {

        SpringApplication.run(TestApplication.class, args);
    }

    @Bean
    public Module jdk8Module() {
        return new Jdk8Module();
    }

    @Bean
    public Module guavaModule() {
        return new GuavaModule();
    }
}

Here these two beans automatically registered in jackson ObjectMapper. How it's registered this modules automatically?

Upvotes: 2

Views: 1150

Answers (2)

Andreas
Andreas

Reputation: 159185

This is done by the Spring Boot JacksonAutoConfiguration class.

As the javadoc says:

Auto configuration for Jackson. The following auto-configuration will get applied:

  • an ObjectMapper in case none is already configured.
  • a Jackson2ObjectMapperBuilder in case none is already configured.
  • auto-registration for all Module beans with all ObjectMapper beans (including the defaulted ones).

Upvotes: 3

anish sharma
anish sharma

Reputation: 590

Any beans of type com.fasterxml.jackson.databind.Module are automatically registered with the auto-configured Jackson2ObjectMapperBuilder and are applied to any ObjectMapper instances that it creates. This provides a global mechanism for contributing custom modules when you add new features to your application. so it should be enough to define a bean and it will be automatically registered in jackson ObjectMapper.

Upvotes: 2

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