However, /pet.json causes a NullPointerException:
play.core.ActionInvoker$$anonfun$receive$1$$anon$1: Execution exception [[NullPointerException: null]]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:82) [play_2.9.1.jar:2.0]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:63) [play_2.9.1.jar:2.0]
at akka.actor.Actor$class.apply(Actor.scala:290) [akka-actor.jar:2.0]
at play.core.ActionInvoker.apply(Invoker.scala:61) [play_2.9.1.jar:2.0]
at akka.actor.ActorCell.invoke(ActorCell.scala:617) [akka-actor.jar:2.0]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:179) [akka-actor.jar:2.0]
Caused by: java.lang.NullPointerException: null
at controllers.SwaggerBaseApiController.JsonResponse(ApiHelpController.scala:73) ~[swagger-play2_2.9.1.jar:1.1-SNAPSHOT]
at controllers.SwaggerBaseApiController.returnValue(ApiHelpController.scala:67) ~[swagger-play2_2.9.1.jar:1.1-SNAPSHOT]
at controllers.ApiHelpController$$anonfun$getResource$1.apply(ApiHelpController.scala:43) ~[swagger-play2_2.9.1.jar:1.1-SNAPSHOT]
at controllers.ApiHelpController$$anonfun$getResource$1.apply(ApiHelpController.scala:40) ~[swagger-play2_2.9.1.jar:1.1-SNAPSHOT]
at play.api.mvc.Action$$anon$1.apply(Action.scala:170) ~[play_2.9.1.jar:2.0]
at play.core.ActionInvoker$$anonfun$receive$1$$anonfun$4.apply(Invoker.scala:74) ~[play_2.9.1.jar:2.0]