~ Support build on JDK 1.8 & 11, check for publish under JDK 11

Author: elizarov

build.gradle

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 import org.jetbrains.kotlin.konan.target.HostManager
 
@@ -68,6 +68,7 @@ buildscript {
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
         classpath "org.jetbrains.kotlinx:atomicfu-gradle-plugin:$atomicfu_version"
         classpath "com.moowork.gradle:gradle-node-plugin:$gradle_node_version"
+        classpath "org.openjfx:javafx-plugin:$javafx_plugin_version"
         classpath "org.jetbrains.kotlinx:binary-compatibility-validator:$binary_compatibility_validator_version"
 
         // JMH plugins
@@ -261,8 +262,26 @@ configure(subprojects.findAll { !unpublished.contains(it.name) }) {
 // Report Kotlin compiler version when building project
 println("Using Kotlin compiler version: $org.jetbrains.kotlin.config.KotlinCompilerVersion.VERSION")
 
+// --------------- Publish only from under JDK11+ ---------------
+task checkJdkForPublish {
+    doFirst {
+        String javaVersion = System.properties["java.version"]
+        int i = javaVersion.indexOf('.')
+        int javaVersionMajor =  (i < 0 ? javaVersion : javaVersion.substring(0, i)).toInteger()
+        if (javaVersionMajor < 11) {
+            throw new GradleException("Project can be build for publishing only under JDK 11+, but found ${javaVersion}")
+        }
+    }
+}
+
 // --------------- Configure sub-projects that are published ---------------
-task deploy(dependsOn: getTasksByName("publish", true) + getTasksByName("publishNpm", true))
+def publishTasks = getTasksByName("publish", true) + getTasksByName("publishNpm", true)
+
+publishTasks.each {
+    it.dependsOn checkJdkForPublish
+}
+
+task deploy(dependsOn: publishTasks)
 
 apply plugin: 'base'
 

gradle.properties

@@ -18,6 +18,7 @@ reactor_vesion=3.2.5.RELEASE
 reactive_streams_version=1.0.2
 rxjava2_version=2.2.8
 javafx_version=11.0.2
+javafx_plugin_version=0.0.8
 binary_compatibility_validator_version=0.1.1
 
 # Android versions

ui/kotlinx-coroutines-javafx/build.gradle

@@ -2,14 +2,21 @@
  * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
 
-plugins {
-    id 'org.openjfx.javafxplugin' version '0.0.8'
+static int javaVersionMajor() {
+    String javaVersion = System.properties["java.version"]
+    int i = javaVersion.indexOf('.')
+    return (i < 0 ? javaVersion : javaVersion.substring(0, i)).toInteger()
 }
 
-javafx {
-    version = javafx_version
-    modules = [ 'javafx.controls' ]
-    configuration = 'compile'
+// JDK11+ does not bundle JavaFx and the plugin for JavaFx support is compiled with class file version 55.0 (JDK 11)
+if (javaVersionMajor() >= 11) {
+    apply plugin: 'org.openjfx.javafxplugin'
+    
+    javafx {
+        version = javafx_version
+        modules = ['javafx.controls']
+        configuration = 'compile'
+    }
 }
 
 task checkJdk8() {