HomeController.java

package controllers;

import play.cache.SyncCacheApi;
import play.mvc.*;

import views.html.*;

import javax.inject.Inject;

/**
 * This controller contains an action to handle HTTP requests
 * to the application's home page.
 */
public class HomeController extends Controller {

    private final views.html.index template;

    @Inject
    public HomeController(views.html.index template, SyncCacheApi cacheApi) {
        this.template = template;
        cacheApi.set("hello", "hello there!");
    }

    /**
     * An action that renders an HTML page with a welcome message.
     * The configuration in the <code>routes</code> file means that
     * this method will be called when the application receives a
     * <code>GET</code> request with a path of <code>/</code>.
     */
    public Result index() {
        return ok(template.render("Your new application is ready."));
    }

}

index.scala.html

@import play.cache.SyncCacheApi
@this(cacheApi: SyncCacheApi)

@(message: String)


@main("Welcome to Play") {

    @cacheApi.get[String]("hello")

    @welcome(message, style = "java")

}