Swagger UI Error with Play 2.5.x Application

[joesan]

I just tried to integrate Swagger for my Play framework application and I'm getting NullPointer Exceptions:

I have raised a question in Stackoverflow: https://stackoverflow.com/questions/48974996/play-framework-swagger-ui-integration-error

Here is the problem description once again!

I'm trying to integrate Swagger UI for the Rest API which is served by Play Framework 2.5.x

I did the following:

Included the following dependencies in my build.sbt
"io.swagger" %% "swagger-play2" % "1.5.3"
"org.webjars" %% "webjars-play" % "2.5.0-4"
"org.webjars" % "swagger-ui" % "2.2.0"
Added the following to my routes:
GET /swagger.json controllers.ApiHelpController.getResources
GET /docs/ controllers.Assets.at(path="/public/swagger-ui",file="index.html")
GET /docs/*file controllers.Assets.at(path="/public/swagger-ui",file)
I then try accessing the swagger.json
Here is the error that I get:

[error] application -

! @77515gnlp - Internal server error, for (GET) [/swagger.json] ->

play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[NullPointerException: null]]
at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:280)
at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:206)
at play.core.server.netty.PlayRequestHandler$$anonfun$2$$anonfun$apply$1.applyOrElse(PlayRequestHandler.scala:100)
at play.core.server.netty.PlayRequestHandler$$anonfun$2$$anonfun$apply$1.applyOrElse(PlayRequestHandler.scala:99)
at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:346)
at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:345)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70)
at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:44)
at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:252)
Caused by: java.lang.NullPointerException: null
at play.modules.swagger.ApiListingCache$$anonfun$listing$1.apply(ApiListingCache.scala:15)
at play.modules.swagger.ApiListingCache$$anonfun$listing$1.apply(ApiListingCache.scala:11)
at scala.Option.orElse(Option.scala:289)
at play.modules.swagger.ApiListingCache$.listing(ApiListingCache.scala:11)
at controllers.SwaggerBaseApiController.getResourceListing(ApiHelpController.scala:128)
at controllers.ApiHelpController$$anonfun$getResources$1.apply(ApiHelpController.scala:74)
at controllers.ApiHelpController$$anonfun$getResources$1.apply(ApiHelpController.scala:71)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:371)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:370)
at play.api.mvc.Action$.invokeBlock(Action.scala:498)
Is there anything else that I should be adding or looking into?

[UnconventionalMindset]

I answered you on stack overflow

[webron]

Unfortunately, we don't provide nor maintain the webjars, so we can't help with it.