Configure kotlin directly in only project that uses it and enable testLatestDeps (#3081)

gradle/dependencies.gradle

@@ -19,8 +19,6 @@ ext {
     logback           : "1.2.3",
     bytebuddy         : "1.10.18", // Also explicitly specified in buildSrc
     scala             : "2.11.12",
-    kotlin            : "1.4.0",
-    coroutines        : "1.3.0",
     springboot        : "2.3.1.RELEASE",
     junit5            : "5.7.1",
     checkerFramework  : "3.6.1",
@@ -100,8 +98,6 @@ ext {
       "org.slf4j:jul-to-slf4j:${versions.slf4j}",
     ],
     scala                        : "org.scala-lang:scala-library:${versions.scala}",
-    kotlin                       : "org.jetbrains.kotlin:kotlin-stdlib:${versions.kotlin}",
-    coroutines                   : "org.jetbrains.kotlinx:kotlinx-coroutines-core:${versions.coroutines}",
     junitApi                     : "org.junit.jupiter:junit-jupiter-api:${versions.junit5}",
     assertj                      : "org.assertj:assertj-core:${versions.assertj}",
     awaitility                   : "org.awaitility:awaitility:${versions.awaitility}",

gradle/test-with-kotlin.gradle

@@ -1,8 +0,0 @@
-// Enable testing kotlin code in groovy spock tests.
-apply plugin: 'org.jetbrains.kotlin.jvm'
-
-tasks.named('compileTestGroovy').configure {
-  //Note: look like it should be `classpath += files(sourceSets.test.kotlin.classesDirectory)`
-  //instead, but kotlin plugin doesn't support it (yet?)
-  classpath += files(compileTestKotlin.destinationDir)
-}

instrumentation/instrumentation.gradle

@@ -8,7 +8,6 @@ buildscript {
 
   dependencies {
     classpath "net.bytebuddy:byte-buddy-gradle-plugin:${versions.bytebuddy}"
-    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
   }
 }
 plugins {

instrumentation/kotlinx-coroutines/javaagent/kotlinx-coroutines-javaagent.gradle

@@ -1,5 +1,8 @@
+plugins {
+  id 'org.jetbrains.kotlin.jvm'
+}
+
 apply from: "$rootDir/gradle/instrumentation.gradle"
-apply from: "$rootDir/gradle/test-with-kotlin.gradle"
 
 muzzle {
   pass {
@@ -18,6 +21,13 @@ dependencies {
   compileOnly deps.opentelemetryKotlin
 
   testImplementation deps.opentelemetryKotlin
-  testImplementation deps.kotlin
-  testImplementation deps.coroutines
+  testImplementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+  // Use first version with flow support since we have tests for it.
+  testLibrary "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0"
+}
+
+tasks.named('compileTestGroovy').configure {
+  //Note: look like it should be `classpath += files(sourceSets.test.kotlin.classesDirectory)`
+  //instead, but kotlin plugin doesn't support it (yet?)
+  classpath += files(compileTestKotlin.destinationDir)
 }

settings.gradle

@@ -7,6 +7,7 @@ pluginManagement {
     id "io.github.gradle-nexus.publish-plugin" version "1.0.0"
     id "me.champeau.jmh" version "0.6.4"
     id "net.ltgt.errorprone" version "1.3.0"
+    id 'org.jetbrains.kotlin.jvm' version '1.5.10'
     id 'org.unbroken-dome.test-sets' version '4.0.0'
     id "nebula.release" version "15.3.0"
     id 'org.gradle.test-retry' version '1.2.0'