RE: sbt java.lang.RuntimeException: No main class detected.

[S Ahmed]

I have a single file app Web.scala:

import org.jboss.netty.handler.codec.http.{HttpRequest, HttpResponse}

import com.twitter.finagle.builder.ServerBuilder

import com.twitter.finagle.http.{Http, Response}

import com.twitter.finagle.Service

import com.twitter.util.Future

import java.net.InetSocketAddress

import util.Properties

object Web {

  def main(args: Array[String]) {

    val port = Properties.envOrElse("PORT", "8080").toInt

    println("Starting on port:"+port)

    ServerBuilder()

      .codec(Http())

      .name("hello-server")

      .bindTo(new InetSocketAddress(port))

      .build(new Hello)

    println("Started.")

  }

}

class Hello extends Service[HttpRequest, HttpResponse] {

  def apply(req: HttpRequest): Future[HttpResponse] = {

    val response = Response()

    response.setStatusCode(200)

    response.setContentString("Hello World...\n")

    Future(response)

  }

}

With sbt, if I do:

> run

java.lang.RuntimeException: No main class detected.

at scala.sys.package$.error(package.scala:27)

[trace] Stack trace suppressed: run last compile:run for the full output.

[error] (compile:run) No main class detected.

[error] Total time: 0 s, completed Mar 26, 2013 8:39:24 PM

> run last compile:run

java.lang.RuntimeException: No main class detected.

at scala.sys.package$.error(package.scala:27)

[trace] Stack trace suppressed: run last compile:run for the full output.

[error] (compile:run) No main class detected.

[error] Total time: 0 s, completed Mar 26, 2013 8:39:28 PM

How can I get this to run the main class?  This worked yesterday for me but I just upgraded sbt.

>sbt launcher version 0.12.2

>Scala code runner version 2.9.2 -- Copyright 2002-2011, LAMP/EPFL

[Eduardo M. Cavalcanti]

Try
def main(args: Array[String]): Unit
instead of

def main(args: Array[String])

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