Play 2.0 JavaでScalateを使いたい場合はorg.fusesource.scalate.japi.TemplateEngineFacadeを使えばプラグインなしでいける。

Application.java

package controllers;

import play.*;
import play.mvc.*;
import controllers.*;
import views.html.*;
import org.fusesource.scalate.japi.TemplateEngineFacade;

import java.util.HashMap;
import java.util.Map;

public class Application extends Controller {

    public static Result index() {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("name", "__name__");
        map.put("title", "__title__");
        map.put("request", request());
        TemplateEngineFacade engine = new TemplateEngineFacade();
        return ok(engine.layout("app/views/" + "scalate.mustache", map));
    }

}