Added JSON library and small example

app/controllers/ExamplesController.java

+package controllers;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import play.libs.Json;
+import play.mvc.Controller;
+import play.mvc.Result;
+
+/**
+ * This controller contains an action to handle HTTP requests
+ * to the application's home page.
+ */
+public class ExamplesController extends Controller {
+
+    /**
+     * An action that returns a JSON object, to show how Jackson and Play JSON are
+     * used to construct a JSON response
+     * @return
+     */
+    public Result returnJson() {
+        ObjectNode json = Json.newObject();
+        json.put("Hello", "World");
+        ArrayNode arr = json.putArray("names");
+        arr.add("Alice");
+        arr.add("Bob");
+        arr.add("Charlie");
+
+        return ok(json);
+    }
+
+    /**
+     * To receive a JSON object from the body of a request, you can get it with
+     * request().body().asJson()
+     * @return
+     */
+    public Result receiveJsonPost() {
+
+        JsonNode json = request().body().asJson();
+
+        String name = json.findPath("name").asText();
+
+        return ok("The name was " + name);
+
+    }
+
+}

build.sbt

@@ -12,3 +12,5 @@ resolvers += Resolver.url("Hopper releases", url("http://hopper.une.edu.au/artif
 resolvers += Resolver.url("Hopper snapshots", url("http://hopper.une.edu.au/artifactory/libs-snapshot"))
 
 libraryDependencies += guice
+
+libraryDependencies += "com.typesafe.play" %% "play-json" % "2.6.10"
\ No newline at end of file

conf/routes

@@ -5,5 +5,8 @@
 # An example controller showing a sample home page
 GET     /                           controllers.HomeController.index
 
+GET     /example/json               controllers.ExamplesController.returnJson()
+POST    /example/json               controllers.ExamplesController.receiveJsonPost()
+
 # Map static resources from the /public folder to the /assets URL path
 GET     /assets/*file               controllers.Assets.versioned(path="/public", file: Asset)

logs/application.log

+2018-09-11 01:14:07,982 [INFO] from play.api.http.EnabledFilters in play-dev-mode-akka.actor.default-dispatcher-4 - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):
+
+    play.filters.csrf.CSRFFilter
+    play.filters.headers.SecurityHeadersFilter
+    play.filters.hosts.AllowedHostsFilter
+
+2018-09-11 01:14:08,089 [INFO] from play.api.Play in play-dev-mode-akka.actor.default-dispatcher-4 - Application started (Dev)
+2018-09-11 01:14:08,483 [WARN] from play.api.mvc.DefaultJWTCookieDataCodec in application-akka.actor.default-dispatcher-4 - decode: cookie has invalid signature! message = JWT signature does not match locally computed signature. JWT validity cannot be asserted and should not be trusted.
+2018-09-11 01:14:08,485 [INFO] from play.api.mvc.DefaultJWTCookieDataCodec in application-akka.actor.default-dispatcher-4 - The JWT signature in the cookie does not match the locally computed signature with the server.
+This usually indicates the browser has a leftover cookie from another Play application,
+so clearing cookies may resolve this error message.