XML response incorrect Spring REST - jaxb

Question

I have a problem when generating XML response of my bean
Controller's method :
#GetMapping(value = PING_URL, produces = MediaType.APPLICATION_XML_VALUE)
public ResponseEntity<Pong> getPingPage() {
ServicesType services = new ServicesType();
services.getService().add(this.commonService.getDBSservice());
final Pong pong = new Pong();
pong.setVersion(this.commonService.getVersion());
pong.setServices(services);
pong.setStatus(this.commonService.getGlobalStatus(pong).name());
return ResponseEntity.ok(pong);
}
Bean :
#XmlAccessorType(XmlAccessType.FIELD)
#XmlType(name = "", propOrder = {
"status",
"version",
"services"
})
#XmlRootElement(name = "pong")
public class Pong {
#XmlElement(required = true)
protected String status;
#XmlElement(required = true)
protected String version;
#XmlElement(required = true)
protected ServicesType services;
// GETTER / SETTER
Response :
<Pong>
<status>OK</status>
<version/>
<services>
<service>
<service>
<status>OK</status>
<log/>
<name>BDD</name>
</service>
</service>
</services>
</Pong>
As you can see, xmlRootElement is "Pong" instead of "pong" but it was ignored.
Have you any idea how to resolve the issue please ?
I'm using Spring (5.3.14) with Jackson (2.13.1).

Answer 1

I was able to solve it by registering an XML Configuration that tells Jackson to use a Mapper that has the JaxbAnnotationModule registered.
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import com.fasterxml.jackson.module.jaxb.JaxbAnnotationModule;
#Configuration
public class MySpringRestServiceXmlConfiguration {
/**
* The converter must be declared for #XMLRootElement and #XmlElement annotations to work properly.
*/
#Bean
MappingJackson2XmlHttpMessageConverter getMappingJackson2XmlHttpMessageConverter() {
var jaxbAnnotationModule = new JaxbAnnotationModule();
var mappingJackson2XmlHttpMessageConverter = new MappingJackson2XmlHttpMessageConverter();
mappingJackson2XmlHttpMessageConverter.getObjectMapper().registerModule(jaxbAnnotationModule);
return mappingJackson2XmlHttpMessageConverter;
}
}
Don't forget to put this in a package that is scanned by your Spring Rest Service Application.