Adding log4j jar in the compiled jar.

Author: Likhit

build.gradle

@@ -11,11 +11,18 @@ plugins {
     id 'java-library'
 }
 
+configurations {
+    // configuration that holds jars to include in the jar
+    extraLibs
+}
+
 dependencies {
     // These dependency is used internally, and not exposed to consumers on their own compile classpath.
     implementation files('lib/log4j.jar')
     implementation project('RejigInterface')
 
+    extraLibs files('lib/log4j.jar')
+
     // Use JUnit test framework
     testImplementation 'junit:junit:4.12'
 }
@@ -27,6 +34,12 @@ repositories {
     jcenter()
 }
 
+jar {
+    from {
+        configurations.extraLibs.collect { it.isDirectory() ? it : zipTree(it) }
+    }
+}
+
 // Run tests as tasks
 task memcachedBench(type: JavaExec) {
     main = 'edu.usc.cs550.rejig.client.test.MemcachedBench'