Standalone deployment of Scalatra servlet

Question

I implemented a Scalatra servlet and now want to create an executable jar, just like described in this tutorial: http://www.scalatra.org/2.2/guides/deployment/standalone.htm

Answer 1

I recently ran into trouble doing this.

First, you need to make sure that jetty is available at compile time. These two lines:

"org.eclipse.jetty" % "jetty-webapp" % "8.1.8.v20121106" % "container",
"org.eclipse.jetty.orbit" % "javax.servlet" % "3.0.0.v201112011016" %     "container;provided;test" artifacts (Artifact("javax.servlet", "jar", "jar")),

Need to have compile in them:

"org.eclipse.jetty" % "jetty-webapp" % "8.1.8.v20121106" % "compile;container",
"org.eclipse.jetty.orbit" % "javax.servlet" % "3.0.0.v201112011016" % "compile;container;provided;test" artifacts (Artifact("javax.servlet", "jar", "jar"))

Second, from your description it sounds like sbt-assembly is not configured correctly. You need to remove (comment out) these lines:

lazy val buildSettings = Defaults.defaultSettings ++ Seq(
  version := "0.1",
  organization := "de.foobar",
  scalaVersion := "2.10.1"
)

lazy val app = Project("app", file("app"),
  settings = buildSettings ++ assemblySettings) settings(
    // your settings here
)

You will need to add ++ assemblySettings to your foobar project immediately after scalateSettings. Your plugins.sbt file also needs to contain the following line in it:

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.9.0")

For reference, I recommend against using sbt-assembly because you will most likely run into dependency conflicts that will need to be resolved with a merge strategy. Instead I suggest you use a task that collects your dependencies into a directory (examples here and here). And then add them to the java classpath using java -cp /lib/* ....

Third, be wary of the Jetty project in Scalatra's GitHub. I used:

import java.net.InetSocketAddress
import org.eclipse.jetty.server.Server
import org.eclipse.jetty.servlet.DefaultServlet

import org.scalatra.servlet.ScalatraListener
import org.eclipse.jetty.webapp.WebAppContext

object Jetty {
  def main(args: Array[String]) = {
    val socketAddress = new InetSocketAddress(8080)
    val server = new Server(socketAddress)
    val context = new WebAppContext()
    context.setContextPath("/")
    context.setResourceBase("src/main/webapp")
    context.addEventListener(new ScalatraListener)
    context.addServlet(classOf[DefaultServlet], "/")
    server.setHandler(context)
    server.start()
    server.join()
  }
}

Finally, it might be worth double checking your ScalatraBootstrap is in the usual place.

Hope that helps. If not I can post my entire build.scala for you.