Hello world not working

[octavz]

Hi, I am sure I am doing something wrong, but Finch is very unfriendly with first time users.

I couldn't find any template that works out of the box so I adapted:

import cats.effect.IO
import com.twitter.finagle.Http

object Main extends App with Endpoint.Module[IO] {
    val api: Endpoint[IO, String] = get("hello") { Ok("Hello, World!") }
    Http.server.serve(":8080", api.toServiceAs[Text.Plain])
}

scalaVersion := "2.12.7"

libraryDependencies ++= Seq(
  "org.typelevel" %% "cats-core" % "1.4.0",
  "org.typelevel" %% "cats-effect" % "1.0.0",
  // -- config
  "com.typesafe" % "config" % "1.3.3",
  // -- testing --
  "org.scalacheck" %% "scalacheck" % "1.14.0" % "test",
  // -- Logging --
  "ch.qos.logback" % "logback-classic" % "1.2.3",
  "com.typesafe.scala-logging" %% "scala-logging" % "3.9.0",
  // -- Finch --
  "com.github.finagle" %% "finch-core" % FinchVersion,
  "com.github.finagle" %% "finch-circe" % FinchVersion,
  // -- json/circe --
  "io.circe" %% "circe-core" % CirceVersion,
  "io.circe" %% "circe-generic" % CirceVersion,
  "io.circe" %% "circe-jawn" % CirceVersion
)

and I get

[error] /home/xxx/projects/scala/kafka-support/src/main/scala/org/demo/Main.scala:7:39: type Module is not a member of object io.finch.Endpoint
[error] object Main extends App with Endpoint.Module[IO] {
[error]                                       ^
[error] /home/xxx/projects/scala/kafka-support/src/main/scala/org/demo/Main.scala:8:14: wrong number of type arguments for io.finch.Endpoint, should be 1
[error]     val api: Endpoint[IO, String] = get("hello") { Ok("Hello, World!") }
[error]              ^
[error] /home/xxx/projects/scala/kafka-support/src/main/scala/org/demo/Main.scala:8:41: type mismatch;
[error]  found   : String("hello")
[error]  required: ?{def apply: ?}
[error] Note that implicit conversions are not applicable because they are ambiguous:
[error]  both method augmentString in object Predef of type (x: String)scala.collection.immutable.StringOps
[error]  and method stringToPath in trait Paths of type (s: String)io.finch.Endpoint[shapeless.HNil]
[error]  are possible conversion functions from String("hello") to ?{def apply: ?}
[error]     val api: Endpoint[IO, String] = get("hello") { Ok("Hello, World!") }
[error]                                         ^
[error] /home/xxx/projects/scala/kafka-support/src/main/scala/org/demo/Main.scala:8:37: not found: value get
[error]     val api: Endpoint[IO, String] = get("hello") { Ok("Hello, World!") }

[sergeykolbasov]

Hi @octavz

What's the version of finch you're using?

[rpless]

I believe the issue is using the finch-core and finch-circe modules with Module[IO]. Per the README, you'll need to use finchx-core and finchx-circe (note the x after finch in the artifact name) . The finch artifacts are meant to support the old style of creating endpoints that are bound to the future implementation.

[vkostyukov]

Hey @octavz! Try looking at https://github.com/finch/finch.g8 that I composed today. It has instructions on how to generate a barebones Finch project that compiles and runs.

[octavz]

@vkostyukov ty, I tested with finchx and it builds, however i got the netty classpath issue.
I will check the gitter8 template, ty.

[monksy]

With the example I'm seeing + updated dependencies:

overloaded method apply with alternatives:
[error]   (mapper: io.finch.internal.Mapper[cats.effect.IO,shapeless.HNil])io.finch.Endpoint[cats.effect.IO,mapper.Out] <and>
[error]   (input: io.finch.Input)io.finch.Endpoint.Result[cats.effect.IO,shapeless.HNil]