Added some other options to ensure Java 8 is used

EpcQrCodeJavaFxApp/build.gradle.kts

@@ -10,12 +10,14 @@ group = "net.codinux.banking.epcqrcode.javafx"
 val mainClassName = "net.codinux.banking.epcqrcode.EpcQrCodeJavaFxAppKt"
 
 
-dependencies {
-    implementation(project(":EpcQrCode"))
-
-    implementation("net.dankito.utils:java-fx-utils:1.0.8")
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
 }
-
 
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
@@ -26,12 +28,21 @@ tasks.withType<KotlinCompile>() {
     kotlinOptions.jvmTarget = "1.8"
 }
 
+
+dependencies {
+    implementation(kotlin("stdlib-jdk8"))
+
+    implementation(project(":EpcQrCode"))
+
+    implementation("net.dankito.utils:java-fx-utils:1.0.8")
+}
+
+
 application {
     mainClassName = mainClassName
 }
 
 
-
 tasks.withType<Jar> {
     isZip64 = true