settings.gradle: If at least Java 11 and Gradle 4.10 are detected, wallet-template is being built again.

This also means wallet-template is under continuous integration by Travis again.

wallettemplate/build.gradle

@@ -1,5 +1,11 @@
+plugins {
+    id 'org.openjfx.javafxplugin' version '0.0.7' apply false
+}
+
 apply plugin: 'java'
 apply plugin: 'eclipse'
+apply plugin: 'application'
+apply plugin: 'org.openjfx.javafxplugin'
 
 eclipse.project.name = 'bitcoinj-wallettemplate'
 
@@ -12,11 +18,16 @@ dependencies {
     implementation 'org.slf4j:slf4j-jdk14:1.7.25'
 }
 
-sourceCompatibility = 1.8
+javafx {
+    modules = [ 'javafx.controls', 'javafx.fxml' ]
+}
+
+sourceCompatibility = 1.11
 compileJava.options.encoding = 'UTF-8'
 compileTestJava.options.encoding = 'UTF-8'
 
-task wallet_template(type: JavaExec) {
-    main = 'wallettemplate.Main'
-    classpath = sourceSets.main.runtimeClasspath
+mainClassName = 'wallettemplate.Main'
+
+// task wallet_template can be replaced with the 'run' task
+task wallet_template(dependsOn: 'run') {
 }