I tested the usage of the Aries JAX-RS Whiteboard reference implementation a little bit. It works for me using v1.0.1, v1.0.2 and v1.0.3. It stopped working for me using v1.0.4 and v1.0.5.
I added a small example to explain what's not working anymore: I created an application: ```java @Component(service = Application.class) @JaxrsApplicationBase("foo") @JaxrsName(FooApplication.APP_NAME) public class FooApplication extends Application { public static final String APP_NAME = "my-foo-app"; } ``` I created a REST endpoint that produces text: ```java @Component(service = BarText.class, scope = ServiceScope.PROTOTYPE) @JaxrsResource @JaxrsApplicationSelect("(osgi.jaxrs.name=" + FooApplication.APP_NAME + ")") @Path("text") @Produces(MediaType.TEXT_PLAIN) public class BarText { @GET public String get() { return "hello world"; } } ``` I created a REST endpoint that produces JSON: ```java @Component(service = BarJson.class, scope = ServiceScope.PROTOTYPE) @JaxrsResource @JaxrsApplicationSelect("(osgi.jaxrs.name=" + FooApplication.APP_NAME + ")") @Path("json") @Produces(MediaType.APPLICATION_JSON) public class BarJson { @GET public String get() { return "hello world"; } } ``` Using the v1.0.3 I can call "http://127.0.0.1:8080/foo/text" and "http://127.0.0.1:8080/foo/json". Then I added `@JSONRequired` to the BarJson class. A call to "http://127.0.0.1:8080/foo/text" still succeeded. On "http://127.0.0.1:8080/foo/json" I got a 404. So far, all fine. I added a bundle that provides an JAX-RS extension, a MessageBodyReader and a MessageBodyWriter for the media type JSON (two separate components for the reader and writer). ```java @Component(scope = PROTOTYPE) @JaxrsExtension @JaxrsMediaType(APPLICATION_JSON) public class JohnzonMessageBodyReader<T> extends IgnorableTypes implements MessageBodyReader<T> { ... ``` ```java @Component(scope = PROTOTYPE) @JaxrsExtension @JaxrsMediaType(APPLICATION_JSON) public class JohnzonMessageBodyWriter<T> extends IgnorableTypes implements MessageBodyWriter<T> { ``` Now, again a call to "http://127.0.0.1:8080/foo/text" succeeded and a call to "http://127.0.0.1:8080/foo/json" succeeded. After that I updated the Aries JAX-RS Whiteboard implementation from 1.0.3 to 1.0.5. A call to "http://127.0.0.1:8080/foo/text" still succeeded. On "http://127.0.0.1:8080/foo/json" I got a 404. Is there something wrong on my extension that provides the JSON media type? Best regards, Markus