Spring boot jersey jackson

Question

I have a Jackson configuration related question in my Spring boot project

As described in the spring boot blog

I am trying to set up serialization of objects.

After adding a new bean configuration in my configuration

@Bean public Jackson2ObjectMapperBuilder jacksonBuilder() { Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder(); builder.propertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES); return builder; } 

When I try to infer an instance of my User class, the json result is not in CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES

 Class User { private String firstName = "Joe Blow"; public String getFirstName() { return firstName; } } 

Json output:

 { "firstName": "Joe Blow" } 

but not

 { "first_name": "Joe Blow" } 

Maybe I need to register something in my jersey configuration in order to activate my own obejctMapper configuration

 @Configuration public class JerseyConfig extends ResourceConfig { public JerseyConfig() { packages("my.package); } } 

thanks

Answer 1

The general way to configure ObjectMapper applications for JAX-RS / Jersey is ContextResolver . for instance

 @Provider public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> { private final ObjectMapper mapper; public ObjectMapperContextResolver() { mapper = new ObjectMapper(); mapper.setPropertyNamingStrategy( PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES ); } @Override public ObjectMapper getContext(Class<?> type) { return mapper; } } 

It must be raised by scanning the package, or you can explicitly register it if it is not in the package area.

 public JerseyConfig() { register(new ObjectMapperContextResolver()); // Or if there is an injection required // register it as a .class instead of instance } 

ContextResolver is called during marshalling and disassembly. The serial or deserialized class / type will be passed to the getContext method. Thus, you can even use more than one cartographer for different types or even more use cases.

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UPDATE

Starting with Spring Boot 1.4, you can simply create an ObjectMapper Spring bean, and Spring Boot will create a ContextResolver for you and use ObjectMapper

 // in your `@Configuration` file. @Bean public ObjectMapper mapper() {}