build: use Kotlin DSL

vul/vul-springboot1/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+    id("java")
+    id("war")
+}
+
+java {
+    targetCompatibility = JavaVersion.VERSION_1_8
+    sourceCompatibility = JavaVersion.VERSION_1_8
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-web:1.5.22.RELEASE")
+    providedRuntime("org.springframework.boot:spring-boot-starter-tomcat:1.5.22.RELEASE")
+    testImplementation("org.springframework.boot:spring-boot-starter-test:1.5.22.RELEASE")
+}
+
+tasks.register("bootJar", Jar::class.java) {
+    archiveBaseName.set(project.name)
+    archiveVersion.set("")
+
+    from(sourceSets.main.get().output)
+    from(configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) })
+    manifest {
+        attributes["Main-Class"] = "com.reajason.javaweb.vul.springboot1.VulSpringboot1Application"
+    }
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}