MessageBodyWriter not found for media type=application/xml

Question

I want to make a REST API Response in two formats depending on the HttpHeaders of the request :

@Context
HttpHeaders headers; 

public Response toResponse(MyValidationException exception) {
   if(headers.getMediaType().toString().equals(MediaType.APPLICATION_XML)){
     return Response.status(Status.BAD_REQUEST).entity(exception.getErrors()).type(MediaType.APPLICATION_XML).build();
  }else{
     return Response.status(Status.BAD_REQUEST).entity(exception.getErrors()).type(MediaType.APPLICATION_JSON).build();
}}

It's working for the MediaType.APPLICATION_JSON, but for MediaType.APPLICATION_XML I get the following Error :

org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo MessageBodyWriter not found for media type=application/xml, type=class java.util.HashMap$EntrySet, genericType=class java.util.HashMap$EntrySet.

Any Idea to solve this problem?

Solution 1

Do you have the jaxb dependency in your project?

<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>jersey-media-jaxb</artifactId>
  <version>x.x.x</version>
</dependency>

If yes, perhaps you could try to wrap the exception.getErrors() (which appears to be a Map?) into a GenericEntity and giving that entity to the response:

GenericEntity<Map<?, ?>> entity = new GenericEntity..

return Response.status(Status.X).entity(entity).type(MediaType.APPLICATION_XML).build();

Solution 2

Adding GenericEntity<>, as described by ialex, solved my problem. This is what I did:

GenericEntity<List<?>> genericEntity = new GenericEntity<List<?>> (exception.getErrors()) {};
Response.status(Status.BAD_REQUEST).entity(genericEntity).build();

Comments

[Brahim LAMJAGUAR]

To cast the exception I wrote : GenericEntity<Map<String,String>> entity = (GenericEntity<Map<String,String>>) exception.getErrors(); but I got an exception : java.lang.ClassCastException: java.util.HashMap cannot be cast to javax.ws.rs.core.GenericEntity

[ialex]

Don't cast the object directly, just create it anew: GenericEntity<Map<String,String>> entity = new GenericEntity<Map<String,String>>(exception.getErrors()){};

[Brahim LAMJAGUAR]

I tried but I have the same first problem of the post :/