Setup hello world ktor server

backend/app/build.gradle.kts

@@ -8,6 +8,8 @@
 plugins {
     // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
     id("org.jetbrains.kotlin.jvm") version "1.9.0"
+    id("io.ktor.plugin") version "2.3.5"
+
 
     // Apply the application plugin to add support for building a CLI application in Java.
     application
@@ -19,16 +21,25 @@ repositories {
 }
 
 dependencies {
+    val ktor_version = "2.3.5"
+    val logback_version = "1.4.11"
+    val slf4j_version = "2.0.9"
+
     // Use the Kotlin JUnit 5 integration.
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
 
     // Use the JUnit 5 integration.
     testImplementation("org.junit.jupiter:junit-jupiter-engine:5.9.3")
 
-    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    implementation("io.ktor:ktor-server-core-jvm:$ktor_version")
+    implementation("io.ktor:ktor-server-netty-jvm:$ktor_version")
+    implementation("io.ktor:ktor-server-content-negotiation:$ktor_version")
+    testImplementation("io.ktor:ktor-server-test-host:$ktor_version")
+
+    implementation("ch.qos.logback:logback-classic:$logback_version")
+    implementation("org.slf4j:slf4j-api:$slf4j_version")
+
 
-    // This dependency is used by the application.
-    implementation("com.google.guava:guava:32.1.1-jre")
 }
 
 // Apply a specific Java toolchain to ease working on different environments.
@@ -47,3 +58,9 @@ tasks.named<Test>("test") {
     // Use JUnit Platform for unit tests.
     useJUnitPlatform()
 }
+
+ktor {
+    fatJar {
+        archiveFileName.set("fat.jar")
+    }
+}

backend/app/src/main/kotlin/backend/App.kt

@@ -3,13 +3,20 @@
  */
 package backend
 
-class App {
-    val greeting: String
-        get() {
-            return "Hello World!"
+import io.ktor.server.application.*
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+
+fun server() = embeddedServer(factory = Netty, port = 8080) {
+    routing {
+        get {
+            call.respondText("Hello, world!")
         }
+    }
 }
 
 fun main() {
-    println(App().greeting)
+    server().start(wait = true)
 }