HandlebarsExample Vert.x Example

error.log

java.lang.IllegalArgumentException: Cannot find resource /index.hbs
	at io.vertx.ext.web.templ.handlebars.impl.HandlebarsTemplateEngineImpl$Loader.sourceAt(HandlebarsTemplateEngineImpl.java:137)
	at com.github.jknack.handlebars.Handlebars.compile(Handlebars.java:438)
	at com.github.jknack.handlebars.Handlebars.compile(Handlebars.java:419)
	at io.vertx.ext.web.templ.handlebars.impl.HandlebarsTemplateEngineImpl.render(HandlebarsTemplateEngineImpl.java:86)
	at de.jotschi.graphql.HandlebarsExample.lambda$0(HandlebarsExample.java:22)
	at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:227)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:121)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:134)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:80)
	at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:41)
	at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:50)
	at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:32)
	at io.vertx.core.http.impl.HttpServerRequestImpl.handleBegin(HttpServerRequestImpl.java:151)
	at io.vertx.core.http.impl.Http1xServerConnection.handleMessage(Http1xServerConnection.java:138)
	at io.vertx.core.impl.EventLoopContext.schedule(EventLoopContext.java:45)
	at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:173)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
	at io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtensionHandler.channelRead(WebSocketServerExtensionHandler.java:102)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.vertx.core.http.impl.Http1xUpgradeToH2CHandler.channelRead(Http1xUpgradeToH2CHandler.java:98)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.end(Http1xOrH2CHandler.java:61)
	at io.vertx.core.http.impl.Http1xOrH2CHandler.channelRead(Http1xOrH2CHandler.java:38)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:844)

HandlebarsExample.java

public class HandlebarsExample extends AbstractVerticle {

	@Override
	public void start(Future<Void> startFuture) throws Exception {
		HttpServerOptions options = new HttpServerOptions();
		options.setPort(9999);
		HttpServer server = vertx.createHttpServer(options);
		Router router = Router.router(vertx);

		HandlebarsTemplateEngine engine = HandlebarsTemplateEngine.create(vertx);
		router.route("/test").handler(rc -> {
			engine.render(rc.data(), "index.hbs", rr -> {
				if (rr.failed()) {
					rr.cause().printStackTrace();
					rc.fail(rr.cause());
				} else {
					rc.response().end(rr.result());
				}
			});
		});

		server.requestHandler(router::handle);
		server.listen(e -> {
			if (e.failed()) {
				startFuture.fail(e.cause());
			} else {
				startFuture.complete();
			}
		});

	}

	public static void main(String[] args) {
		Vertx vertx = Vertx.vertx();
		vertx.deployVerticle(new HandlebarsExample());
	}

}