Cannot resolve symbol in routes file with intellij 14 and play framework 2.4 reactivemongo

Question

I'm using IntelliJ 14.1.4 and Play framework 2.4. I copied some code from this github project: https://github.com/JAVEO/play-reactivemongo-polymer to test out reactivemongo. Basically, I copied the Posts.scala to my controller folder. It's a class:

package controllers

import javax.inject.Inject

import play.api.libs.concurrent.Execution.Implicits.defaultContext
import play.api.libs.json.Json
import play.api.mvc.{Action, BodyParsers, Call, Controller, Result}
import play.modules.reactivemongo.{MongoController, ReactiveMongoApi, ReactiveMongoComponents}
import reactivemongo.api.commands.WriteResult
import reactivemongo.bson.{BSONDocument, BSONObjectID}
import reactivemongo.core.actors.Exceptions.PrimaryUnavailableException

class Posts @Inject()(val reactiveMongoApi: ReactiveMongoApi)
  extends Controller with MongoController with ReactiveMongoComponents {
...
}

in the routes file, IntellJ cannot resolve this line:

GET     /api/posts                  controllers.Posts.list

It seems that IntellJ only recognize controllers declared as object but not class.

Trying to run this using activator got the compilation error:

No Json serializer as JsObject found for type play.api.libs.json.JsObject. Try to implement an implicit OWrites or OFormat for this type
...

Any help?

As the original sample app is working fine, it's necessary to check your dependencies and that you properly use import play.modules.reactivemongo.json._: reactivemongo.org/releases/0.11/documentation/… — cchantep
I think there are two problems here. First problem is about IntelliJ cannot resolve injected routes. The second problem is Json serializer. I tried to import the github example. IntelliJ also cannot resolve controllers.Posts.list. — yang
For the second problem, it turns out to be related to play reactivemongo versions. In my build.sbt, I used "0.11.6.play24" as the tutorial on reactivemongo suggested. This causes the error message of "No Json ...". I changed the version to "0.11.0.play24" as the github example did. The error message went away. — yang
As indicated check the imports correspond to the used version. — cchantep
I tried to add import play.modules.reactivemongo.json._ and use 0.11.6.play24. It didn't solve the problem. Still throws the No Json error. — yang

yang yang · Accepted Answer · 2016-01-28T09:20:57

Upgrade plugin and intellij to the latest version solved the problem. Looks like a bug.

Cannot resolve symbol in routes file with intellij 14 and play framework 2.4 reactivemongo

1 Answers