+doc add Java testkit documentation and scaladoc

akka-docs-dev/rst/java/code/docs/http/javadsl/testkit/MyAppService.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2009-2015 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package docs.http.javadsl.testkit;
+
+//#simple-app
+import akka.http.javadsl.server.*;
+import akka.http.javadsl.server.values.Parameters;
+
+public class MyAppService extends HttpApp {
+    RequestVal<Double> x = Parameters.doubleValue("x");
+    RequestVal<Double> y = Parameters.doubleValue("y");
+
+    public RouteResult add(RequestContext ctx, double x, double y) {
+        return ctx.complete("x + y = " + (x + y));
+    }
+
+    @Override
+    public Route createRoute() {
+        return
+            route(
+                get(
+                    pathPrefix("calculator").route(
+                        path("add").route(
+                            handleReflectively(this, "add", x, y)
+                        )
+                    )
+                )
+            );
+    }
+}
+//#simple-app