package example

import org.slf4j.LoggerFactory

object Hello extends Greeting with App {
  val logger = LoggerFactory.getLogger(classOf[Hello])
  logger.info(s"greeting is $greeting")
  println(greeting)
}

trait Greeting {
  lazy val greeting: String = "hello"
}

[info] Compiling 2 Scala sources to /Users/robert.kuhar/dev/hellosbt/target/scala-2.12/classes ...
[error] /Users/robert.kuhar/dev/hellosbt/src/main/scala/example/Hello.scala:6:48: not found: type Hello
[error]   val logger = LoggerFactory.getLogger(classOf[Hello])
[error]                                                ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 1 s, completed Dec 17, 2017 1:20:28 PM