Fix broken test and warnings

build.gradle

@@ -22,13 +22,17 @@ configurations {
     testImplementation.extendsFrom compileOnly
 }
 
+tasks.withType(ScalaCompile).configureEach {
+    scalaCompileOptions.additionalParameters = ["-release:${JavaVersion.current()}".toString()]
+}
+
 tasks.register('scalaTest', JavaExec) {
     dependsOn['testClasses']
     mainClass = 'org.scalatest.tools.Runner'
     args = ['-R', 'build/classes/scala/test', '-o']
+    jvmArgs = ["--add-exports=java.base/sun.nio.ch=ALL-UNNAMED"] // https://lists.apache.org/thread/p1yrwo126vjx5tht82cktgjbmm2xtpw9
     classpath = sourceSets.test.runtimeClasspath
 }
-
 test.dependsOn scalaTest
 
 jar {

gradle.properties

@@ -10,3 +10,4 @@ projectGroup=com.barrelsofdata.sparkexamples
 projectVersion=1.0
 
 org.gradle.daemon=false
+org.gradle.warning.mode=all