nimbus-jose-jwt Plugin Type Not Found Error - scala

Question

I am trying to compile code sample from this book (Play Framework Cookbook 2nd Edition) for JWT with nimbus-jose-jwt.
However it said Plugin trait type not found during compilation. I checked API documentation, Plugin is available at play.api package.
import play.api.{Logger, Play, Application, Plugin}
class JWTPlugin #Inject() (app: Application) extends Plugin {...}
I tried DI version with and without
routesGenerator := InjectedRoutesGenerator at build.sbt with same error.
nimbus-jose-jwt version: 3.8.2. Tried with latest 4.22, with same error.
scala: 2.11.8
play: 2.5.4
Appreciate any pointer. Thanks.

Answer 1

play.api.Plugin has been removed in Play 2.5.x. You can turn the plugin into a Module instead as described here: https://www.playframework.com/documentation/2.5.x/PluginsToModules
But the easiest solution is to turn the JWTPlugin class into a plain Scala object (e.g. JWTUtil), remove the onStart and onStop methods, remove the "private val jwt" declarations/assigments from all files in the example and call the sign() and verify() methods on the JWTUtil object instead.
Maybe you need some more minor modifications that I have forgotten, but anyway, the example works for me when the JWT implementation doesn't inherit from play.api.Plugin.