Loggerの名前の違い

build.sbt

val scalaVersion_3 = "3.1.1"

lazy val root = project
  .in(file("."))
  .settings(
    name := "logger-name-example",
    organization := "com.github.tototoshi",
    version := "0.1.0-SNAPSHOT",
    scalaVersion := scalaVersion_3,
    libraryDependencies ++= Seq(
      "org.slf4j" % "slf4j-api" % "1.7.36",
      "ch.qos.logback" % "logback-classic" % "1.2.10",
      "org.scalatest" %% "scalatest" % "3.2.11" % "test"
    )
  )

Main.scala

package com.example

import org.slf4j.LoggerFactory

trait BaseLogger {

  private val classNameLogger = LoggerFactory.getLogger(classOf[BaseLogger])

  private val thisLogger = LoggerFactory.getLogger(this.getClass)

  def logByClassName(message: String): Unit = {
    classNameLogger.info(message)
  }

  def logByThis(message: String): Unit = {
    thisLogger.info(message)
  }

}

class ExampleLogger extends BaseLogger

object Main {

  private val logger = LoggerFactory.getLogger(getClass)
  private val exampleLogger = new ExampleLogger

  def main(args: Array[String]): Unit = {
    logger.info("Hello from logger")
    exampleLogger.logByClassName("Hello from classNameLogger")
    exampleLogger.logByThis("Hello from thisLogger")
  }

}

output.txt

2022/02/10 20:55:50.085 [sbt-bg-threads-7] INFO  com.example.Main$ - Hello from logger
2022/02/10 20:55:50.087 [sbt-bg-threads-7] INFO  com.example.BaseLogger - Hello from classNameLogger
2022/02/10 20:55:50.087 [sbt-bg-threads-7] INFO  com.example.ExampleLogger - Hello from thisLogger