is it possible to call one jax-rs method from another?

Question

suppose i have some jax-rs resource class:

@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class ResourceA {
   @GET
   pu         


        

Answer 1

You can get it using ResourceContext as follows:

@Context 
ResourceContext resourceContext;

This will inject the ResourceContext into your Resource. You then get the resource you want using:

ResourceB b = resourceContext.getResource(ResourceB.class);

The Javadoc for ResourceContext is here. You can find a similar question here

Answer 2

I'm not aware of any possibility to do this from a resource method, but if it fits your use case, what you could do is implement your redirect logic in a pre matching request filter, for example like so:

@Provider
@PreMatching
public class RedirectFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext requestContext) {
        UriInfo uriInfo = requestContext.getUriInfo();
        String prefix = "/redirect";
        String path = uriInfo.getRequestUri().getPath();
        if (path.startsWith(prefix)) {
            String newPath = path.substring(prefix.length());
            URI newRequestURI = uriInfo.getBaseUriBuilder().path(newPath).build();
            requestContext.setRequestUri(newRequestURI);
        }
    }
}

This will redirect every request to /redirect/some/resource to /some/resource (or whatever you pass to requestContext.setRequestUri()) internally, before the resource method has been matched to the request and is executed and without http redirects or an additional internal http request.