Embed a Java servlet in a Ring/Compojure app

[MichaelBlume]

Sometimes a dependency provides an out-of-the-box Servlet object. A good example is the HystrixMetricsStreamServlet which exposes metrics to an external hystrix dashboard. Is there a good one-size-fits-all way to embed such a Servlet in a Compojure/Ring app?

[weavejester]

There might be a library available to do that, but I'm not aware of one off hand. Compojure is just a routing library, so this is a little beyond its scope.

[jiacai2050]

@MichaelBlume I think this is what you need

• https://github.com/josephwilk/hystrix-event-stream-clj#how-about-with-jetty

[MichaelBlume]

@jiacai2050 I tried that, when I wired it into my project I got an error No implementation of method: :write-body-to-stream of protocol: #'ring.core.protocols/StreamableResponseBody found for class: lamina.core.channel.Channel -- I assume some dependency has changed since it worked

[jiacai2050]

@MichaelBlume Try this adapter

• https://github.com/killme2008/ring-jetty-hystrix-adapter/blob/master/src/ring_jetty_hystrix_adapter/core.clj#L163