Demonstrate a bug in either vertx or the documentation

vertx-bug.groovy

//invoke with VERTX_OPTS="" vertx run vertx-bug.groovy

def client = vertx.createNetClient();

//The docs appear to be wrong. TODO file bug with vertx http://vertx.io/core_manual_groovy.html#catching-exceptions-on-the-net-client
//Caused by: groovy.lang.MissingMethodException: No signature of method: org.vertx.groovy.core.net.impl.DefaultNetClient.exceptionHandler() is applicable for argument types: (vertx-bug$_run_closure1) values: [vertx-bug$_run_closure1@32d16fe3]
client.exceptionHandler { ex -> println "Failed to connect $ex"; container.exit() }

client.connect(1234, "localhost") { socket ->
  socket.dataHandler { buffer ->
    println "client recieved: ${buffer}"
    container.exit()
  }

  def str = "hello"
  print "client sending $str"
  socket << str << "\n"
}