Migrate Library to Kotlin

library/build.gradle

@@ -1,6 +1,6 @@
 plugins {
-    // Apply the scala Plugin to add support for Scala.
-    id "scala"
+    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
+    id "org.jetbrains.kotlin.jvm"
 
     // Apply the java-library plugin for API and implementation separation.
     id "java-library"
@@ -15,26 +15,21 @@ repositories {
 }
 
 dependencies {
-    // Use Scala 2.13 in our library project
-    implementation "org.scala-lang:scala-library:2.13.3"
+    // Align versions of all Kotlin components
+    implementation platform("org.jetbrains.kotlin:kotlin-bom")
+
+    // Use the Kotlin JDK 8 standard library.
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
 
     // This dependency is used internally, and not exposed to consumers on their own compile classpath.
     implementation "com.google.guava:guava:30.0-jre"
 
-    // Use Scalatest for testing our library
-    testImplementation "junit:junit:4.13.1"
-    testImplementation "org.scalatest:scalatest_2.13:3.2.3"
-    testImplementation "org.scalatestplus:junit-4-13_2.13:3.2.2.0"
+    // Use the Kotlin test library.
+    testImplementation "org.jetbrains.kotlin:kotlin-test"
 
-    // Need scala-xml at test runtime
-    testRuntimeOnly "org.scala-lang.modules:scala-xml_2.13:1.2.0"
+    // Use the Kotlin JUnit integration.
+    testImplementation "org.jetbrains.kotlin:kotlin-test-junit"
 
     // This dependency is exported to consumers, that is to say found on their compile classpath.
     api "org.apache.commons:commons-math3:3.6.1"
 }
-
-tasks.named("jar") {
-    manifest {
-        attributes("Implementation-Title": "TribuFu", "Implementation-Version": project.version)
-    }
-}