Ambiguous implicit in Play

Well, I am not sure whether you are in the situation mentioned by @rspencer .

I got the same error message in another situation:

In the Controller, when I try to make an Action unimplemented with the method ??? like this:

def test = ??? 

Then I open the browser and visit http://localhost:9000, a error message appear:

ambiguous implicit values: both method wrapJava in object HandlerInvokerFactory of type => play.core.routing.HandlerInvokerFactory[play.mvc.Result] and method wrapJavaPromise in object HandlerInvokerFactory of type => play.core.routing.HandlerInvokerFactory[play.libs.F.Promise[play.mvc.Result]] match expected type play.core.routing.HandlerInvokerFactory[T]

If you are in this situation, jsut change the ??? to TODO like this:

def test = TODO 

Revist http://localhost:9000, it's ok now.

The routes file is not Scala and only compiles down to Scala. Consequently, the syntax you've used is incorrect. What you wrote:

GET /activity/ controllers.ActivitiesController.show(id: Int) 

should probably be something like:

GET /activity/:id controllers.ActivitiesController.show(id: Int) 

and your ActivitiesController should then have:

class ActivitiesController extends Controller { def show(id: Int) = Action { ... } } 

Note the :id in the path component. This instructs the routes compiler to expect a string at that point in the URL path that can be implicitly converted to an Int. It then does the conversion and passes the integer argument to the controller's show method. You might be benefited from reading the documentation