How to obtain the Jackson ObjectMapper in use by Spring?

How to obtain the Jackson ObjectMapper in use by Spring?

In a Spring application, you can obtain the Jackson ObjectMapper instance that Spring is using for JSON serialization and deserialization by injecting it as a Spring bean or by using the Jackson2ObjectMapperBuilder. Here are two common approaches:

Approach 1: Injecting the ObjectMapper as a Bean

You can create an ObjectMapper bean in your Spring configuration and then inject it wherever you need it in your application.

  • Define the ObjectMapper bean in your Spring configuration, typically in a @Configuration class or XML configuration:
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class JacksonConfig { @Bean public ObjectMapper objectMapper() { return new ObjectMapper(); } }
  • Now, you can inject the ObjectMapper bean into any Spring-managed component or service:
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.stereotype.Service; @Service public class MyService { private final ObjectMapper objectMapper; public MyService(ObjectMapper objectMapper) { this.objectMapper = objectMapper; } // Use objectMapper for JSON serialization/deserialization }

Approach 2: Using Jackson2ObjectMapperBuilder

You can use the Jackson2ObjectMapperBuilder provided by Spring to configure and build an ObjectMapper instance with custom settings.

  • Autowire Jackson2ObjectMapperBuilder in your component or service:
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder; import org.springframework.stereotype.Service; @Service public class MyService { private final ObjectMapper objectMapper; public MyService(Jackson2ObjectMapperBuilder objectMapperBuilder) { this.objectMapper = objectMapperBuilder.build(); } // Use objectMapper for JSON serialization/deserialization }
  • You can also customize the ObjectMapper by chaining methods on the Jackson2ObjectMapperBuilder:
import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder; import org.springframework.stereotype.Service; @Service public class MyService { private final ObjectMapper objectMapper; public MyService(Jackson2ObjectMapperBuilder objectMapperBuilder) { this.objectMapper = objectMapperBuilder .indentOutput(true) // Customize ObjectMapper settings here .build(); } // Use objectMapper for JSON serialization/deserialization }

Using Jackson2ObjectMapperBuilder gives you the flexibility to configure the ObjectMapper with custom settings as needed.

Choose the approach that best fits your application's requirements and design.

More Tags

subplot catmull-rom-curve codesandbox textkit simd formclosing mongodb-oplog polygon kvm google-analytics

More Java Questions

More Entertainment Anecdotes Calculators

More Stoichiometry Calculators

More Internet Calculators

More Biology Calculators