Jackson: Explicit Properties

ExplicitPropertiesFilter.java

public class ExplicitPropertiesFilter extends SimpleBeanPropertyFilter {

	@Override
	protected boolean include(BeanPropertyWriter writer) {
		JsonProperty anno = writer.getAnnotation(JsonProperty.class);
		return anno != null;
	}

	@Override
	protected boolean include(PropertyWriter writer) {
		if (writer instanceof BeanPropertyWriter) {
			return include((BeanPropertyWriter) writer);
		}
		return true;
	}
}

ExplicitPropertiesMixin.java

@JsonFilter("explicitProperties")
public abstract class ExplicitPropertiesMixin {}

JacksonConfig.java

@Configuration
public class JacksonConfig extends WebMvcConfigurerAdapter {
	@Bean
	public ObjectMapper jacksonObjectMapper() {
		ObjectMapper objectMapper = new ObjectMapper();
		
		objectMapper.addMixInAnnotations(Object.class, ExplicitPropertiesMixin.class);
		
		objectMapper.setFilters(
				new SimpleFilterProvider()
					.addFilter("explicitProperties", new ExplicitPropertiesFilter())
			);
		
		return objectMapper;
	}
}