Spark graphx moved to a new project due to a incompatibility of scala compiler

play-framework/student-api/app/utils/Util.java

@@ -0,0 +1,17 @@
+package utils;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import play.libs.Json;
+
+public class Util {
+    public static ObjectNode createResponse(Object response, boolean ok) {
+        ObjectNode result = Json.newObject();
+        result.put("isSuccessful", ok);
+        if (response instanceof String) {
+            result.put("body", (String) response);
+        } else {
+            result.putPOJO("body", response);
+        }
+        return result;
+    }
+}