update spring boot, kotlin and gradle versions

build.gradle.kts

@@ -0,0 +1,47 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+plugins {
+  id("org.springframework.boot") version "2.2.4.RELEASE"
+  id("io.spring.dependency-management") version "1.0.9.RELEASE"
+  kotlin("jvm") version "1.3.61"
+  kotlin("plugin.spring") version "1.3.61"
+}
+
+group = "com.example"
+version = "1.0.0-SNAPSHOT"
+java.sourceCompatibility = JavaVersion.VERSION_1_8
+
+val developmentOnly by configurations.creating
+configurations {
+  runtimeClasspath {
+    extendsFrom(developmentOnly)
+  }
+}
+
+repositories {
+	mavenCentral()
+}
+
+
+dependencies {
+  implementation("org.springframework.boot:spring-boot-starter-actuator")
+  implementation("org.springframework.boot:spring-boot-starter-security")
+  implementation("org.springframework.boot:spring-boot-starter-web")
+  implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+  implementation("org.jetbrains.kotlin:kotlin-reflect")
+  implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+  developmentOnly("org.springframework.boot:spring-boot-devtools")
+  testImplementation("org.springframework.boot:spring-boot-starter-test") {
+    exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
+  }
+  testImplementation("org.springframework.security:spring-security-test")
+}
+
+tasks.withType<Test> {
+  useJUnitPlatform()
+}
+tasks.withType<KotlinCompile> {
+  kotlinOptions {
+    freeCompilerArgs = listOf("-Xjsr305=strict")
+    jvmTarget = "1.8"
+  }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-bin.zip

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "ssl-demo"

src/test/kotlin/com/example/ssldemo/SslDemoApplicationTests.kt

@@ -1,11 +1,8 @@
 package com.example.ssldemo
 
-import org.junit.Test
-import org.junit.runner.RunWith
+import org.junit.jupiter.api.Test
 import org.springframework.boot.test.context.SpringBootTest
-import org.springframework.test.context.junit4.SpringRunner
 
-@RunWith(SpringRunner::class)
 @SpringBootTest
 class SslDemoApplicationTests {