Scala 318 intro to log4j

build.sbt

@@ -274,7 +274,11 @@ lazy val scala_libraries_3 = (project in file("scala-libraries-3"))
       "com.github.pureconfig" %% "pureconfig-enumeratum" % "0.17.1"
     ),
     libraryDependencies += "org.scalamock" %% "scalamock" % "5.1.0" % Test,
-    libraryDependencies += "com.softwaremill.retry" %% "retry" % "0.3.5"
+    libraryDependencies += "com.softwaremill.retry" %% "retry" % "0.3.5",
+    libraryDependencies ++= Seq(
+      "org.apache.logging.log4j" %% "log4j-api-scala" % "12.0",
+      "org.apache.logging.log4j" % "log4j-core" % "2.13.0" % Runtime
+    )
   )
 
 lazy val scala_strings = (project in file("scala-strings"))

scala-libraries-3/src/main/resources/log4j2.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>

scala-libraries-3/src/main/scala/com/baeldung/scala/log4j/LoggingApp.scala

@@ -0,0 +1,14 @@
+package com.baeldung.scala.log4j
+
+import org.apache.logging.log4j.scala.Logging
+
+import scala.util.{Failure, Success, Try}
+
+object LoggingApp extends App with Logging {
+  logger.info("Writing an informative message to the log")
+  logger.debug("Writing a debug message to the log")
+  Try(1 / 0) match {
+    case Success(value)     => logger.warn("Math has changed")
+    case Failure(exception) => logger.catching(exception)
+  }
+}