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https://issues.apache.org/jira/browse/CXF-6412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550406#comment-14550406
 ] 

Sergey Beryozkin commented on CXF-6412:
---------------------------------------

This is the current code:

{code:java}
private static class MessageBodyReaderComparator 
        implements Comparator<ProviderInfo<MessageBodyReader<?>>> {
        
        public int compare(ProviderInfo<MessageBodyReader<?>> p1, 
                           ProviderInfo<MessageBodyReader<?>> p2) {
            MessageBodyReader<?> e1 = p1.getProvider();
            MessageBodyReader<?> e2 = p2.getProvider();
            
            List<MediaType> types1 = JAXRSUtils.getProviderConsumeTypes(e1);
            types1 = JAXRSUtils.sortMediaTypes(types1, null);
            List<MediaType> types2 = JAXRSUtils.getProviderConsumeTypes(e2);
            types2 = JAXRSUtils.sortMediaTypes(types2, null);
    
            int result = JAXRSUtils.compareSortedMediaTypes(types1, types2, 
null);
            if (result != 0) {
                return result;
            }
            return compareClasses(e1, e2);
        }
    }
{code}

> MessageBodyReader and MessageBodyWritter should follow different sorting rule
> -----------------------------------------------------------------------------
>
>                 Key: CXF-6412
>                 URL: https://issues.apache.org/jira/browse/CXF-6412
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>    Affects Versions: 3.0.4, 2.7.15, 3.0.5
>            Reporter: iris ding
>
> According to JSR-339 spec, section 4.2.1 and 4.2.2, we need follow different 
> sorting rule for MessageBodyReader and MessageBodyWritter:
> For MessageBodyReader, it is:
>   <h3> 2. Identify the Java type of the parameter whose value will be mapped 
> from the entity body. Section 3.7</h3>
> describes how the Java method is chosen.
>    <h3>3. Select the set of MessageBodyReader classes that support the media 
> type of the request, see Section  4.2.3. </h3>
> For MessageBodyWritter, it is:
>   <h3>4. Sort the selected MessageBodyWriter providers with a primary key of 
> generic type where providers whose generic type is the nearest superclass of 
> the object class are sorted first and a secondary key of media type (see 
> Section 4.2.3).</h3>
> But in our implementation, we use the same sorting rule:
>  1. compareClasses() ->compareSortedMediaTypes()
> This caused an issue in https://issues.apache.org/jira/browse/CXF-6380.
> Actually we need to adjust the MessageBodyReader sorting method.



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