ZIO learning - using zio logging with log4j2 / published by https://github.com/dacr/code-examples-manager #3532fec8-5527-403e-a06f-f1a8f9a57dec/ab449a66920e363ec868a7fa13ca56e017b18dea

zio-learning-logging-2-hello-log4j.sc

// summary : ZIO learning - using zio logging with log4j2
// keywords : scala, zio, learning, logging, pure-functional, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 3532fec8-5527-403e-a06f-f1a8f9a57dec
// created-on : 2022-06-30T22:08:34+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.2.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "dev.zio::zio-logging:2.1.12"
//> using dep "dev.zio::zio-logging-slf4j:2.1.12"
//> using dep "org.apache.logging.log4j:log4j-api:2.20.0"
//> using dep "org.apache.logging.log4j:log4j-core:2.20.0"
//> using dep "org.apache.logging.log4j:log4j-slf4j-impl:2.20.0"
// ---------------------

import zio.*
import zio.logging.*
import zio.logging.backend.SLF4J

// ----------------------------------------
// configure log4j programmatically
import org.slf4j.{Logger, LoggerFactory}
import org.apache.logging.log4j.{LogManager,Level}
import org.apache.logging.log4j.core.LoggerContext

val context = LogManager.getContext(false).asInstanceOf[LoggerContext]
val config = context.getConfiguration()
val rootConfig = config.getLoggerConfig(LogManager.ROOT_LOGGER_NAME)
rootConfig.setLevel(Level.DEBUG)
context.updateLoggers()
// ----------------------------------------


object Encapsulated extends ZIOAppDefault {
  def run =
    ZIO
      .logInfo("Hello world")
      .provide(removeDefaultLoggers, SLF4J.slf4j(format = LogFormat.colored))
}

Encapsulated.main(Array.empty)