Fixed more warnings

Author: yadavan88

play-scala/dependency-injection/app/models/Order.scala

@@ -3,7 +3,7 @@ package models
 import play.api.libs.json.Json
 
 object Order {
-  implicit val writes = Json.writes[Order]
+  implicit val writes: play.api.libs.json.OWrites[models.Order] = Json.writes[Order]
 }
 
 case class Order(id: Long, userId: Long, date: Long, isEnterprise: Boolean)

play-scala/dependency-injection/app/models/User.scala

@@ -5,5 +5,5 @@ import play.api.libs.json.Json
 case class User(id: Long, name: String)
 
 object User {
-  implicit val writes = Json.writes[User]
+  implicit val writes: play.api.libs.json.OWrites[models.User] = Json.writes[User]
 }

play-scala/rest-api/app/controllers/TodoListController.scala

@@ -14,8 +14,8 @@ class TodoListController @Inject() (
   todoList += TodoListItem(1, "test", true)
   todoList += TodoListItem(2, "some other value", false)
 
-  implicit val todoListJson = Json.format[TodoListItem]
-  implicit val newTodoListJson = Json.format[NewTodoListItem]
+  implicit val todoListJson: play.api.libs.json.OFormat[models.TodoListItem] = Json.format[TodoListItem]
+  implicit val newTodoListJson: play.api.libs.json.OFormat[models.NewTodoListItem] = Json.format[NewTodoListItem]
 
   // curl localhost:9000/todo
   def getAll(): Action[AnyContent] = Action {

scala-2-modules/scala2-core/src/main/scala-2/com/baeldung/scala/uniontypes/ArbitraryArityUnionType.scala

@@ -25,8 +25,8 @@ object ArbitraryArityUnionType extends App {
 
   sealed trait AOrB[A, B]
   object AOrB {
-    implicit def aInstance[A, B](a: A) = new AOrB[A, B] {}
-    implicit def bInstance[A, B](b: B) = new AOrB[A, B] {}
+    implicit def aInstance[A, B](a: A): AOrB[A,B] = new AOrB[A, B] {}
+    implicit def bInstance[A, B](b: B): AOrB[A,B] = new AOrB[A, B] {}
   }
 
   def isIntOrString[T <% String AOrB Int](t: T): String = t match {

scala-2-modules/scala2-libraries/src/main/scala-2/com/baeldung/cache/service/SyncQueryCustomMemoizeKeyService.scala

@@ -28,7 +28,7 @@ object GuavaCacheCustomMemoizationKeyConfig {
   val memoizedUnderlyingCustomKeyGuavaCache =
     CacheBuilder.newBuilder().maximumSize(10000L).build[String, Entry[User]]
 
-  implicit val customKeyCacheConfig = CacheConfig(memoization =
+  implicit val customKeyCacheConfig: scalacache.CacheConfig = CacheConfig(memoization =
     MemoizationConfig(toStringConverter = CustomKeyGenerator)
   )
 

scala-2-modules/scala2-libraries/src/main/scala-2/com/baeldung/scala/pureconfig/Configs.scala

@@ -18,10 +18,10 @@ object Protocol {
 }
 
 object impl {
-  implicit val localDateConvert = localDateConfigConvert(
+  implicit val localDateConvert: pureconfig.ConfigConvert[java.time.LocalDate] = localDateConfigConvert(
     DateTimeFormatter.ISO_DATE
   )
-  implicit val localDateTimeConvert = localDateTimeConfigConvert(
+  implicit val localDateTimeConvert: pureconfig.ConfigConvert[java.time.LocalDateTime] = localDateTimeConfigConvert(
     DateTimeFormatter.ISO_DATE_TIME
   )
 }

scala-2-modules/scala2-libraries/src/test/scala-2/com/baeldung/scala/shapeless/ShapelessUnitTest.scala

@@ -138,9 +138,9 @@ class ShapelessUnitTest extends AnyWordSpec with Matchers {
     "calculate length of variant input types" in {
       import shapeless._
       object polyLength extends Poly1 {
-        implicit val listCase = at[List[Int]](i => i.length)
-        implicit val stringCase = at[String](d => d.length)
-        implicit val arrayCase = at[Array[Int]](d => d.length)
+        implicit val listCase: polyLength.Case.Aux[List[Int], Int] = at[List[Int]](i => i.length)
+        implicit val stringCase: polyLength.Case.Aux[String, Int] = at[String](d => d.length)
+        implicit val arrayCase: polyLength.Case.Aux[Array[Int], Int] = at[Array[Int]](d => d.length)
       }
 
       val list = List(1, 2) :: "123" :: Array(1, 2, 3, 4) :: HNil

scala-akka-2/src/main/scala-2/com/baeldung/scala/akka/http/MovieServer.scala

@@ -13,9 +13,9 @@ import scala.util._
 
 object MovieServer extends App {
 
-  implicit val system = ActorSystem("MoviesServer")
+  implicit val system: akka.actor.ActorSystem = ActorSystem("MoviesServer")
   val movieService = new MovieService()
-  implicit val movieFormat = jsonFormat3(Movie)
+  implicit val movieFormat: spray.json.RootJsonFormat[com.baeldung.scala.akka.http.Movie] = jsonFormat3(Movie)
 
   val route = path("movies" / "heartbeat") {
     get {

scala-akka-3/src/test/scala/com/baeldung/scala/akka/TestServiceUnitTest.scala

@@ -10,7 +10,7 @@ class TestServiceUnitTest
   with BeforeAndAfterAll
   with Matchers {
   val testKit = ActorTestKit()
-  implicit val system = testKit.system
+  implicit val system: akka.actor.typed.ActorSystem[Nothing] = testKit.system
 
   // responsible for shutting down the ActorSystem
   override def afterAll(): Unit = testKit.shutdownTestKit()

scala-akka-3/src/test/scala/com/baeldung/scala/akka/UnitTest.scala

@@ -110,7 +110,7 @@ class TrafficLightTestFutUnitTest extends TestServiceUnitTest {
   import scala.concurrent.duration._
   val sender = testKit.spawn(TrafficLight(), "traffic")
   val duration = 300.millis
-  implicit val timeout = Timeout(duration)
+  implicit val timeout: akka.util.Timeout = Timeout(duration)
 
   val signalFut =
     sender.ask(replyTo => TrafficLight.SignalCommand.GetSignal(replyTo))