Self bootstrapped Ratpack app

RatpackServer.groovy

import ratpack.launch.LaunchConfigBuilder
import ratpack.server.RatpackServerBuilder

import static ratpack.groovy.Groovy.chain

def launchConfig = LaunchConfigBuilder.
  baseDir(new File("some/path")).
  port(1234).
  build {
    chain(it) {
      get {
        render "Hello world!"
      }
    }
  }

def server = RatpackServerBuilder.build(launchConfig)
server.start()

try {
  new URL("http://localhost:1234").text == "Hello world!"
} finally {
  server.stop()
}