[#1754] add a way to tell user why the request was bad (clients of ou…

…r webservice wanted messages of why the request was bad)

framework/src/play/mvc/Controller.java

@@ -354,6 +354,13 @@ protected static void notModified() {
         throw new NotModified();
     }
 
+    /**
+     * Send a 400 Bad request
+     */
+    protected static void badRequest(String msg) {
+        throw new BadRequest(msg);
+    }
+
     /**
      * Send a 400 Bad request
      */

framework/src/play/mvc/results/BadRequest.java

@@ -9,6 +9,13 @@
  */
 public class BadRequest extends Result {
 
+	public BadRequest(String msg) {
+		super(msg);
+	}
+
+	public BadRequest() {
+	}
+
     @Override
     public void apply(Request request, Response response) {
         response.status = Http.StatusCode.BAD_REQUEST;