No such method error akka.util.Helpers$.toRootLowerCase(Ljava/lang/String;)Ljava/lang/String; - scala

Question

I am trying to run the following program
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import akka.http.scaladsl.marshalling.ToResponseMarshallable
import akka.http.scaladsl.model.{ContentTypes, HttpEntity}
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server.directives.BasicDirectives
import akka.io.IO
import akka.stream.ActorMaterializer
import com.typesafe.config.ConfigFactory
import spray.json.DefaultJsonProtocol
import scala.concurrent.duration._
import scala.concurrent.Await
trait JsonSupport extends SprayJsonSupport with DefaultJsonProtocol {
implicit val itemFormat = jsonFormat2(Item)
}
final case class Item(name: String, id: Long)
object Main extends App with RestInterface {
val config = ConfigFactory.load()
val host = config.getString("http.host")
val port = config.getInt("http.port")
implicit val system = ActorSystem("My-ActorSystem")
implicit val executionContext = system.dispatcher
implicit val materializer = ActorMaterializer()
//implicit val timeout = Timeout(10 seconds)
val api = routes
Http().bindAndHandle(api, host, port) map {
binding => println(s"The binding local address is ${binding.localAddress}")
}
// recover
// { case ex => println(s"some shit occurred and it is"+ex.getMessage) }
// sys.addShutdownHook {
// system.log.info("Shutting down Spray HTTP in 10 seconds...")
// // NOTE(soakley): We are waiting to unbind to allow the VIP time to query healthcheck status.
// Thread.sleep(10000)
// system.log.info("Shutting down Spray HTTP and allowing 10 seconds for connections to drain...")
// val unbindFuture = Http.unbind(10.seconds)
//
// Await.ready(unbindFuture, 10.seconds)
// }
}
case class Stringer(str1 : String, str2 : String, str3 : String)
trait RestInterface extends Resource {
val routes = questionroutes ~ mydirectiveroute01 ~ mydirectiveroute02
}
trait Resource extends QuestionResource with mydirective01 with mydirective02
trait QuestionResource {
val questionroutes = {
path("hi") {
get {
val stringer_instance = Stringer("questionairre created","whatever","whatever-whatever")
complete(ToResponseMarshallable(stringer_instance.toString()))
}
}
}
}
trait mydirective01 extends BasicDirectives {
val getandputdirective = get | put
val mydirectiveroute01 = {
path("customhi" / IntNumber) {
passednumber1 => {
path(IntNumber) {
passednumber2 => {
getandputdirective {
ctx =>
ctx.complete("Testing get and put directive" + s"The passed string is " + passednumber2 + passednumber1)
}
}
}
}
}
}
}
trait mydirective02 extends BasicDirectives with JsonSupport {
val mydirectiveroute02 =
path("hello") {
get {
complete(HttpEntity(
ContentTypes.`text/html(UTF-8)`,
"<h1>Say hello to akka-http</h1>"))
}
} ~
path("randomitem") {
get {
// will marshal Item to JSON
complete(Item("thing", 42))
}
} ~
path("saveitem") {
post {
// will unmarshal JSON to Item
entity(as[Item]) { item =>
println(s"Server saw Item : $item")
complete(item)
}
}
}
}
But I get the following error
Exception in thread "main" java.lang.NoSuchMethodError: akka.util.Helpers$.toRootLowerCase(Ljava/lang/String;)Ljava/lang/String;
The error seems to be because of this line
implicit val materializer = ActorMaterializer()
May I know where I am going wrong. I have identical pom.xml file and the program in another module and it seems to run fine. I dont understand where I am going wrong. Thanks

Answer 1

I get errors like that when something that should have been re-compiled has not been re-compiled. clean" followed by "compile" in sbt resolves it.

Answer 2

The issue is due to the conflict in dependencies make sure you are using same version for all the related packages you are importing.
example:
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-http-core_2.11</artifactId>
<version>10.0.0</version>
</dependency>
2.11 make sure you have other dependencies with same version
then make a clean build.

Answer 3

Your project dependencies have conflicting versions. The version that has that function gets discarded, and the other version included in the jar (or classpath - depending on how you execute).
Please provide your dependencies file (i.e. sbt.build or gradle.build etc.)