Java 11 support (resolves #33)

build.gradle.kts

@@ -3,6 +3,9 @@ import org.jetbrains.dokka.gradle.DokkaTask
 import org.jetbrains.dokka.gradle.LinkMapping
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
+if (!JavaVersion.current().isJava8Compatible)
+    error("Only JDK 8 or newer is supported!")
+
 plugins {
     kotlin("jvm") version "1.3.20"
     id("org.jetbrains.dokka") version "0.9.17"
@@ -27,6 +30,14 @@ dependencies {
     // Coroutines
     implementation("org.jetbrains.kotlinx", "kotlinx-coroutines-core", "1.1.1")
 
+    // OpenJFX
+    if (JavaVersion.current().isJava11Compatible) {
+        val javafxVersion = System.getProperty("java.version") ?: JavaVersion.current().majorVersion
+        for (pkg in listOf("base", "controls", "fxml", "graphics"))
+            for (os in listOf("linux", "mac", "win"))
+                implementation("org.openjfx", "javafx-$pkg", javafxVersion, classifier = os)
+    }
+
     // Provides RichText TextAreas. Used for code input area.
     implementation("org.fxmisc.richtext", "richtextfx", "0.9.2")
 
@@ -136,8 +147,9 @@ clean.dependsOn(removeBuildFiles)
 
 val compressIncludeFolder by tasks.creating(Zip::class) {
     from("lib/pseuco-java-compiler/include")
-    archiveName = "include.zip"
-    destinationDir = file("src/main/resources")
+
+    archiveFileName.set("include.zip")
+    destinationDirectory.set(file("src/main/resources"))
 }
 
 val compressIncludeRunnerFolder by tasks.creating(Zip::class) {
@@ -148,8 +160,8 @@ val compressIncludeRunnerFolder by tasks.creating(Zip::class) {
     }
     from("src/main/resources/runner")
 
-    archiveName = "includeRunner.zip"
-    destinationDir = file("src/main/resources")
+    archiveFileName.set("includeRunner.zip")
+    destinationDirectory.set(file("src/main/resources"))
 }
 
 val compressIncludeDebugFolder by tasks.creating(Zip::class) {
@@ -161,8 +173,8 @@ val compressIncludeDebugFolder by tasks.creating(Zip::class) {
     }
     from("src/main/resources/debugger")
 
-    archiveName = "includeDebug.zip"
-    destinationDir = file("src/main/resources")
+    archiveFileName.set("includeDebug.zip")
+    destinationDirectory.set(file("src/main/resources"))
 }
 
 processResources.dependsOn(compressIncludeFolder)
@@ -179,8 +191,8 @@ clean.dependsOn(removeIncludeFolders)
 
 /* --- AOP --- */
 
-val ajtools by configurations.creating
-val ajrt by configurations.creating
+val ajtools: Configuration by configurations.creating
+val ajrt: Configuration by configurations.creating
 
 dependencies {
     ajtools("org.aspectj", "aspectjtools", aspectjVersion)