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https://issues.apache.org/jira/browse/ARIES-1966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17024499#comment-17024499
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Markus Rathgeb commented on ARIES-1966:
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I worked around the problem already by using only one component that handles
all the different message types.
I don't fully understand your comment: Is my understanding of the specification
wrong?
Assume there are two services for message body reader + writer, the one is
marked as an JAX-RS extension for the media type plain text, the other is
marked as an JAX-RS extension for the media type JSON. The services are marked
by annotation in the code base that are reflected by OSGi service properties at
runtime (at build time the XML files for the services are generated by taken
the annotations into account). My understanding of the JAX-RS Whiteboard
specification has been that the service / extension for media type plain text
will be used to handle read / write of media type plain text and the service /
extension for media type JSON will be used to handle read / write of media type
JSON.
Is this wrong?
What is the use case for this annotations / service properties if not this one?
> JAX-RS MediaType annotation is not correctly evaluated
> ------------------------------------------------------
>
> Key: ARIES-1966
> URL: https://issues.apache.org/jira/browse/ARIES-1966
> Project: Aries
> Issue Type: Bug
> Components: jax-rs-whiteboard
> Affects Versions: jax-rs-whiteboard-1.0.5, jax-rs-whiteboard-1.0.6
> Reporter: Markus Rathgeb
> Assignee: Carlos Sierra Andrés
> Priority: Major
>
> I realized that my _JaxrsExtension_ for _JaxrsMediaType_ _APPLICATION_JSON_
> is not only used for endpoints that produces JSON (marked by annotation) but
> also for endpoints that produces plain text (marked by annotation)
>
> For testing purposed I used a message body reader and writer implementation
> for the JSON media type that is using GSON.
>
> The annotations and class declaration looks like:
>
> {code:java}
> @Component(scope = PROTOTYPE)
> @JaxrsApplicationSelect("(osgi.jaxrs.name=*)")
> @JaxrsExtension
> @JaxrsMediaType(APPLICATION_JSON)
> public class GsonMessageBodyReaderWriter<T> implements MessageBodyReader<T>,
> MessageBodyWriter<T> { ... }{code}
>
> I see that this class is used for media type JSON and PLAIN_TEXT.
>
> So I created another message body reader for media type plain text and a
> higher service ranking (just for testing).
>
> {code:java}
> @Component(scope = PROTOTYPE)
> @ServiceRanking(100)
> @JaxrsApplicationSelect("(" + JaxrsWhiteboardConstants.JAX_RS_NAME + "=*)")
> @JaxrsExtension
> @JaxrsMediaType(MediaType.TEXT_PLAIN)
> public class PlainTextMediaTypeExtension<T> implements MessageBodyReader<T>,
> MessageBodyWriter<T> { ... }{code}
>
> If both components are available I would assume the
> PlainTextMediaTypeExtension is used for the media type plain text and the
> GsonMessageBodyReaderWriter is used for media type json (because of the
> JaxrsMediaType annotation.
>
> But now PlainTextMediaTypeExtension is used for plain text AND JSON.
>
> I would expect that the message body writer provided by
> {code:java}
> @JaxrsExtension
> @JaxrsMediaType(MediaType.TEXT_PLAIN){code}
> is used for
> {code:java}
> @Produces(MediaType.TEXT_PLAIN){code}
> and the message body writer provided by
> {code:java}
> @JaxrsExtension
> @JaxrsMediaType(APPLICATION_JSON){code}
> is used for
> {code:java}
> @Produces(MediaType.APPLICATION_JSON){code}
>
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