Play Framework + jade4j

Application.java

package controllers;

import play.*;
import play.mvc.*;

public class Application extends JadeController {
  public static Result index() {
    return ok(render("index", "message", "Hello world!"));
  }
}

Build.scala

import sbt._
import Keys._
import PlayProject._

object ApplicationBuild extends Build {

    val appName         = "JadeApp"
    val appVersion      = "1.0-SNAPSHOT"

    val appDependencies = Seq(
        "de.neuland" % "jade4j" % "0.2.15"
    )

    val main = PlayProject(appName, appVersion, appDependencies, mainLang = JAVA).settings(
        resolvers += "jade4j-releases" at "https://github.com/neuland/jade4j/raw/master/releases"     
    )
}

index.jade

!!! 5
html(lang='en')
  head
    meta(charset='utf-8')
    title= message
  body
    h1= message

JadeController.java

package controllers;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import play.api.templates.Html;
import play.mvc.Controller;
import de.neuland.jade4j.Jade4J;
import de.neuland.jade4j.JadeConfiguration;
import de.neuland.jade4j.template.FileTemplateLoader;
import de.neuland.jade4j.template.JadeTemplate;

public class JadeController extends Controller {
	private static final JadeConfiguration jade = new JadeConfiguration();

	static {
		jade.setTemplateLoader(new FileTemplateLoader("app/views/", "UTF-8"));
		jade.setMode(Jade4J.Mode.HTML);
		jade.setPrettyPrint(true);
	}

	/**
	 * Convenience method for rendering a template by name (without .jade
	 * extension).
	 */
	public static Html render(String template) {
		return render(template, new HashMap<String, Object>());
	}

	/**
	 * Convenience method for rendering a template by name (without .jade
	 * extension) and some context variables.
	 */
	public static Html render(String template, Map<String, Object> context) {
		try {
			JadeTemplate jadeTemplate = jade.getTemplate(template);
			return new Html(jade.renderTemplate(jadeTemplate, context));
		}
		catch(IOException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Convenience method for rendering a template by name (without .jade
	 * extension) and some context variables pass as varargs as pairs of
	 * [name] [value] arguments.
	 */
	public static Html render(String template, Object... contextArgs) {
		assert contextArgs.length >=2 && contextArgs.length % 2 == 0;
		Map<String, Object> context = new HashMap<String, Object>();
		for (int i = 0; i < contextArgs.length; i += 2) {
			context.put((String)contextArgs[i], contextArgs[i + 1]);
		}
		return render(template, context);
	}
}

It seems to me that this doesn't work in production mode, the template loader will can not find files, is that right?