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https://issues.apache.org/jira/browse/ARIES-1966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17024527#comment-17024527
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Carlos Sierra Andrés commented on ARIES-1966:
---------------------------------------------
hey [~maggu2810] ,
I believe the expected usage of those OSGi properties on the extension service
is for application services to be able to require those extensions using
{{osgi.jaxrs.extension.select}} so the application would not be started without
having these extensions ready.
I am afraid those properties will not affect the registration of the extension
into the JAX-RS application. In order to instruct the JAX-RS runtime that your
reader or writer should only be registered for a specific media type you can
use {{@Provides}} / {{@Consumes}} annotation on the extension implementations
or via the {{isWritable/isReadable}} methods.
I hope this matches your expectations.
Carlos.
> 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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