Slightly patched up gradle builds. Next steps should be changing gradle.build to gradle.build.kts

.idea/kotlinc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="1.8" />
+  </component>
+</project>

app/build.gradle

@@ -31,7 +31,7 @@ android {
 dependencies {
     implementation project(':common')
     implementation fileTree(include: ['*.jar'], dir: 'libs')
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation 'com.android.support:appcompat-v7:26.1.0'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     implementation 'com.android.support:design:26.1.0'

build.gradle

@@ -9,6 +9,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.0.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.junit.platform:junit-platform-gradle-plugin:+"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -22,24 +23,31 @@ allprojects {
     }
 
     ext.kotlin_version = '1.2.21'
-    ext.commonJunitCompile = [
-            "junit:junit:+",
-            "org.junit.jupiter:junit-jupiter-api:+",
-            "org.junit.platform:junit-platform-runner:+"
-    ]
-
-    ext.commonJunitRuntime = [
-            "org.junit.jupiter:junit-jupiter-engine:+",
-    ]
 }
 
-//subprojects.findAll { !it.name.contains("app")}.each { p ->
-//    configure(p) {
-//        test {
-//            useJUnitPlatform()
-//        }
-//    }
-//}
+subprojects.findAll { it.name.equalsIgnoreCase("common") or it.name.equalsIgnoreCase("server")}.each { p ->
+    configure(p) {
+        apply plugin: 'kotlin'
+        apply plugin: 'org.junit.platform.gradle.plugin'
+        
+        dependencies {
+            implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"){
+                because 'This is the latest version of kotlin?'
+            }
+
+            implementation("org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"){
+                because 'This is required by Jackson'
+            }
+
+            testImplementation 'org.junit.jupiter:junit-jupiter-api:+'
+            testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:+'
+        }
+
+        junitPlatform {
+            details 'tree'
+        }
+    }
+}
 
 task clean(type: Delete) {
     delete rootProject.buildDir

common/build.gradle

@@ -4,26 +4,21 @@ buildscript {
     }
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "org.junit.platform:junit-platform-gradle-plugin:+"
     }
 }
 
 group 'online.anthonycicchetti'
 version '0.1.0'
 
+apply plugin: 'java-library'
 apply plugin: 'kotlin'
-apply plugin: 'org.junit.platform.gradle.plugin'
 
 repositories {
     mavenCentral()
 }
 
 dependencies {
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    compile 'com.fasterxml.jackson.module:jackson-module-kotlin:2.9.0'
-    compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
-    testCompile commonJunitCompile
-    testRuntime commonJunitRuntime
+    api 'com.fasterxml.jackson.module:jackson-module-kotlin:2.9.+'
 }
 
 compileKotlin {
@@ -32,7 +27,3 @@ compileKotlin {
 compileTestKotlin {
     kotlinOptions.jvmTarget = "1.8"
 }
-
-junitPlatform {
-    details 'tree'
-}

common/src/main/kotlin/Transaction.kt

@@ -1,5 +1,3 @@
-import com.fasterxml.jackson.annotation.JsonInclude
-import com.fasterxml.jackson.databind.annotation.JsonSerialize
 import com.fasterxml.jackson.module.kotlin.*
 
 data class Transaction(val cost: Money,

server/build.gradle

@@ -25,11 +25,8 @@ repositories {
 }
 
 dependencies {
-    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    compile project(":common")
-
-    testCompile commonJunitCompile
-    testRuntime commonJunitRuntime
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation project(":common")
 }
 
 compileKotlin {

server/src/main/kotlin/Main.kt

@@ -1,6 +1,3 @@
-import com.fasterxml.jackson.core.JsonFactory
-import com.fasterxml.jackson.core.JsonGenerator
-
 fun main(args: Array<String>) {
     println(Transaction(Money(3020), category = "Transportation", location = "Arian's", timestamp = "Jan 01, 2018 00:00"))