Kotlin + Spring Boot 3.x + Swagger 3

Reference : https://springdoc.org/#kotlin-support

This is very simple.

Add two dependencies to build.gradle.kts

implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.2.0")

---

Whole build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "3.1.5"
    id("io.spring.dependency-management") version "1.1.3"
    kotlin("jvm") version "1.8.22"
    kotlin("plugin.spring") version "1.8.22"
}

group = "com.example"
version = "0.0.1-SNAPSHOT"

java {
    sourceCompatibility = JavaVersion.VERSION_17
}

repositories {
    mavenCentral()
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-web")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")

    // swagger springdoc
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.2.0")


    developmentOnly("org.springframework.boot:spring-boot-devtools")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs += "-Xjsr305=strict"
        jvmTarget = "17"
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks.bootBuildImage {
    builder.set("paketobuildpacks/builder-jammy-base:latest")
}