How can I get resource annotations in a Jersey 2.4 filter?

Question

My question is essentially the same as this one: How can I get resource annotations in a Jersey ContainerResponseFilter.

But I\'m using Java Jersey 2.4 and can\'t fi

Answer 1

If you want to modify processing of a request based on annotations available on a resource method/class then I'd recommend using DynamicFeature from JAX-RS 2.0. Using DynamicFeatures you can assign specific providers for a subset of available resource methods. For example, consider I have a resource class like:

@Path("helloworld")
public class HelloWorldResource {

    @GET
    @Produces("text/plain")
    public String getHello() {
        return "Hello World!";
    }
}

And I'd like to assign a ContainerRequestFilter to it. I'll create:

@Provider
public class MyDynamicFeature implements DynamicFeature {

    @Override
    public void configure(final ResourceInfo resourceInfo, final FeatureContext context) {
        if ("HelloWorldResource".equals(resourceInfo.getResourceClass().getSimpleName())
                && "getHello".equals(resourceInfo.getResourceMethod().getName())) {
            context.register(MyContainerRequestFilter.class);
        }
    }
}

And after registration (if you're using package scanning then you don't need to register it in case it has @Provider annotation on it) MyContainerRequestFilter will be associated with your resource method.

On the other hand you can always inject ResourceInfo in your filter (it can't be annotated with @PreMatching) and obtain the annotations from it:

@Provider
public class MyContainerRequestFilter implements ContainerRequestFilter {

    @Context
    private ResourceInfo resourceInfo;

    @Override
    public void filter(final ContainerRequestContext requestContext) throws IOException {
        resourceInfo.getResourceMethod().getDeclaredAnnotations();
    }
}