[#2170] Action context access from error templates (#1230)

* upgraded javassist to 3.23.1-GA to suppress warning with JDK9+
* Fix public/protected testing with Javassist, by removing the workaround that was fixed in latest version of javassist
* [#2170] Restored action context initialisation during action resolution phase

framework/src/play/mvc/ActionInvoker.java

@@ -57,6 +57,8 @@ public static void resolve(Http.Request request) {
             return;
         }
 
+        initActionContext(request, Http.Response.current.get());
+
         // Route and resolve format if not already done
         if (request.action == null) {
             Play.pluginCollection.routeRequest(request);