From 8f44cebe2b754d35e84cc11e6d2e98e114df5e0a Mon Sep 17 00:00:00 2001
From: Bruno Unna <bruno.unna@gmail.com>
Date: Tue, 4 Oct 2022 19:45:19 +0100
Subject: [PATCH 1/4] Add dependencies for log4j

---
 build.sbt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/build.sbt b/build.sbt
index 6fc0b9814..ed6d2edcd 100644
--- a/build.sbt
+++ b/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_2.13" % "12.0",
+      "org.apache.logging.log4j" % "log4j-core" % "2.19.0" % Runtime
+    )
   )
 
 lazy val scala_strings = (project in file("scala-strings"))

From e0013f761d6237ffbe46593cf07cc3c79e34af41 Mon Sep 17 00:00:00 2001
From: Bruno Unna <bruno.unna@gmail.com>
Date: Wed, 5 Oct 2022 19:19:50 +0100
Subject: [PATCH 2/4] Add dependencies for log4j

---
 build.sbt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build.sbt b/build.sbt
index ed6d2edcd..11e69cd8b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -276,8 +276,8 @@ lazy val scala_libraries_3 = (project in file("scala-libraries-3"))
     libraryDependencies += "org.scalamock" %% "scalamock" % "5.1.0" % Test,
     libraryDependencies += "com.softwaremill.retry" %% "retry" % "0.3.5",
     libraryDependencies ++= Seq(
-      "org.apache.logging.log4j" % "log4j-api-scala_2.13" % "12.0",
-      "org.apache.logging.log4j" % "log4j-core" % "2.19.0" % Runtime
+      "org.apache.logging.log4j" %% "log4j-api-scala" % "12.0",
+      "org.apache.logging.log4j" % "log4j-core" % "2.13.0" % Runtime
     )
   )
 

From c28c323499b40a28e74f23311aca5bdd5d4ba1d9 Mon Sep 17 00:00:00 2001
From: Bruno Unna <bruno.unna@gmail.com>
Date: Wed, 5 Oct 2022 19:20:24 +0100
Subject: [PATCH 3/4] Add configuration for log4j

---
 scala-libraries-3/src/main/resources/log4j2.xml | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 scala-libraries-3/src/main/resources/log4j2.xml

diff --git a/scala-libraries-3/src/main/resources/log4j2.xml b/scala-libraries-3/src/main/resources/log4j2.xml
new file mode 100644
index 000000000..35a6a3ccd
--- /dev/null
+++ b/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>
\ No newline at end of file

From ac9575ad88441d4bf88da227a8ffa3a0ba31fff8 Mon Sep 17 00:00:00 2001
From: Bruno Unna <bruno.unna@gmail.com>
Date: Wed, 5 Oct 2022 19:21:10 +0100
Subject: [PATCH 4/4] Exemplify how to log with log4j

---
 .../com/baeldung/scala/log4j/LoggingApp.scala      | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 scala-libraries-3/src/main/scala/com/baeldung/scala/log4j/LoggingApp.scala

diff --git a/scala-libraries-3/src/main/scala/com/baeldung/scala/log4j/LoggingApp.scala b/scala-libraries-3/src/main/scala/com/baeldung/scala/log4j/LoggingApp.scala
new file mode 100644
index 000000000..db2fe8c03
--- /dev/null
+++ b/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)
+  }
+}