Async.java

@Path("/")
@Consumes(APPLICATION_JSON)
@Produces(APPLICATION_JSON)
public class AsyncHandler {

    private static final ListeningExecutorService threadPool = MoreExecutors.listeningDecorator(
            Executors.newFixedThreadPool(4));

    @POST
    @Path("/{tenantId}/metrics/numeric/{id}/data")
    public void addData(
            @Suspended final AsyncResponse asyncResponse,
            @PathParam("tenantId") final String tenantId,
            @PathParam("id") String id,
            List<Integer> values) {

        Callable<Response> callable = () -> Response.status(Response.Status.OK).build();
        ListenableFuture<Response> future = threadPool.submit(callable);
        Futures.addCallback(future, new FutureCallback<Response>() {
            @Override
            public void onSuccess(Response response) {
                asyncResponse.resume(response);
            }

            @Override
            public void onFailure(Throwable t) {
                String msg = "Failed to perform operation due to an error: " + t.getMessage();
                asyncResponse.resume(Response.serverError().entity(msg).build());
            }
        }, threadPool);
    }

}