From 5768ad24687a11d4fa17135b946c0aba7e15104d Mon Sep 17 00:00:00 2001
From: Eugene Yokota <eed3si9n@gmail.com>
Date: Fri, 28 Jul 2017 00:08:27 -0400
Subject: [PATCH] Log4j 2 SLF4J Binding

Fixes sbt/sbt#3333
---
 build.sbt                  | 2 +-
 project/Dependencies.scala | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/build.sbt b/build.sbt
index 9727ef747..f223bf95f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -356,7 +356,7 @@ lazy val mainProj = (project in file("main"))
   .settings(
     testedBaseSettings,
     name := "Main",
-    libraryDependencies ++= scalaXml.value ++ Seq(launcherInterface),
+    libraryDependencies ++= scalaXml.value ++ Seq(launcherInterface) ++ log4jDependencies,
     managedSourceDirectories in Compile +=
       baseDirectory.value / "src" / "main" / "contraband-scala",
     sourceManaged in (Compile, generateContrabands) := baseDirectory.value / "src" / "main" / "contraband-scala",
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 9c20d1657..593aa0118 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -113,4 +113,11 @@ object Dependencies {
 
   val scalaXml = scala211Module("scala-xml", "1.0.6")
   val scalaParsers = scala211Module("scala-parser-combinators", "1.0.5")
+
+  def log4jVersion = "2.8.1"
+  val log4jApi = "org.apache.logging.log4j" % "log4j-api" % log4jVersion
+  val log4jCore = "org.apache.logging.log4j" % "log4j-core" % log4jVersion
+  val log4jSlf4jImpl = "org.apache.logging.log4j" % "log4j-slf4j-impl" % log4jVersion
+  // specify all of log4j modules to prevent misalignment
+  val log4jDependencies = Vector(log4jApi, log4jCore, log4jSlf4jImpl)
 }