Custom error is not rendered as hal in Spring Boot 1.3 and Spring hateoas 0.19 - rest

Question

Initially I used Spring Boot 1.2 and Spring hateoas in my project, and I need to customize error message. So I created our class instead of the native VndErrors and VndError.
I created a class extends VndErrors.VndError.
public class MyError extends VndErrors.VndError{
//add some my custom fields
}
And antoher class to wrap the MyError.
public class ErrorDetails{
int total;
#JsonProperty("_embedded")
Map<String, List<MyError>> errors;
public ErrorDetails(List<MyError> err){
this.total=err.size();
errors.put("errors", err);
}
}
All exception are hanleded in a #ContrllerAdvice class. I used a custom Jackson2ObjectMapperBuilder to configure ObjectMapper in our project.
When I used Spring 1.2, it was rendered as expected. As following.
{
"total": 1,
"_embedded":{
"errors":[
{
//feilds,
_links:{
"self":""
}
}
]
}
}
But when upgraded to Spring Boot 1.3, it does not work as excepted.
The _links rendered as links, and the content type is application/json in the debug info.
Stage 1:
I am trying to create a simple pojo with a List of Link, it does not work.
public class ErrorDetails{}//pojo includes fields
public class MyError{
//add some my custom fields
#JsonUnwrapped
ErrorDetails content;
List<link> links;
}
public class ErrorResources{
int total;
#JsonProperty("_embedded")
Map<String, List<MyError>> errors;
public ErrorResources(List<MyError> err){
this.total=err.size();
errors.put("errors", err);
}
}
I found some related issues on github of Spring Hateoas project.
https://github.com/spring-projects/spring-hateoas/issues/279
https://github.com/spring-projects/spring-hateoas/issues/324
https://github.com/spring-projects/spring-hateoas/issues/288
I tried one of the suggestions of the issues above, when added #JsonSerialze(using=Jackson2HalModule.HalLinkListSerializer) on links of MyError class.
Got message similar with can not find the correct HttpMessageConverter, the content type of result is application/ocect(binary).
I also tried set the default contentType or default viewResolver to MappingJackson2JsonView, all did not change the result.
Whend I added a custom MappingJackson2HttpMessageConverter in my config:
#Bean
#Order(1)
public MappingJackson2HttpMessageConverter jacksonMessageConverter() {
ObjectMapper halObjectMapper=ctx.getBean("_halObjectMapper", ObjectMapper.class);
MappingJackson2HttpMessageConverter jacksonMessageConverter =
new MappingJackson2HttpMessageConverter();
jacksonMessageConverter.setObjectMapper(halObjectMapper);
jacksonMessageConverter.setSupportedMediaTypes(
Arrays.asList(MediaTypes.HAL_JSON, MediaType.APPLICATION_JSON_UTF8, MediaType.ALL));
return jacksonMessageConverter;
}
The error result is rendered as expected. But I do not think it is the correct way, because I used MediaType.ALL here. And it caused another big problem.
I used TestRestTemplate to test my rest APIs. The restTemlate tried to treat the input data as XML. I saw in the exception it indicated it tried to invoke a XmlHttpMessageConverter to process the content(it is json), even I have set the accept header as application/json. Of course, before I upgraded to Spring Boot 1.3 stack, it worked.
Stage 2:
I tried to use Resources and Resource to wrap the error result.
public class ErrorDetails{}//pojo includes error description fields
public class ErrorResource extends Resource<ErrorDetails>{
}
public class ErrorResources extends Resources<ErrorResource>{
}
public class ErrorMessage {
int total;
ErrorResources errors;
}
Spring still can not render the error result as hal format, it is application/json. When I added
#JsonSerialze(using=Jackson2HalModule.HalResourcesSerializer) on ErrorResources class, it raised an exception which complained the HalResourcesSerializer does not has a default constructor.
In the #ControllerAdvice class, I have tried to set the method return type to ErrorMessage and a wrapper ResponseEntity , it does not work.
Finally, my question is how to render the response body in a #ControllerAdvice same as the one in a normal #RestController? Why it does not work in a #ControllerAdvice class?
Is there a simple workaroud for this issue?