javax.ws.rs.container.ContainerRequestFilter detracts @Suspended

If your are still abused to use Java API for RESTful Web Services but building non blocking api with help of:

    @Suspended asyncResponse: AsyncResponse

Keep in mind that javax.ws.rs.container.ContainerRequestFilter doesn't support non blocking nature and in case it's a part of invocation chain - it will block the calling thread and make usage of @Suspended

The best workaround is to migrate into functional style code - and use loan pattern if possible.

Code can look like:

    @GET
    @Produces("text/html")
    def handleRequest(@Suspended res: AsyncResponse): Unit = {
      authenticateBasicAsync(realm = "secure site") {
        userName =>
          res.resume(s"The user is '$userName'")
      }
    }

This code will be easier migrate in future to akka-http or other async http libraries.