This project is designed to show step by step how to migrate from Java to Kotlin with Spring Boot step by step:

• Step 0: Initial Java project
• Step 1: Java to Kotlin
• Step 2: Spring Boot 2
• Step 3: Spring WebFlux
• Step 4: Kotlin routing DSL

See Spring Kotlin support documentation for more details.

• Spring Data Kay
  • No need for kotlin-noarg plugin since it supports natively Kotlin immutable classes
• Spring Boot 2
  • jackson-module-kotlin and jackson-datatype-jsr310 provided by default with Spring Boot Web starter
  • Mustache suffix is already .mustache by default
  • runApplication<FooApplication>(*args) instead of SpringApplication.run(Application::class.java, *args)
• Null safety
• @RequestParam on nullable parameter
• Extensions
  • Reified type parameters for RestOperations
  • Array like syntax for Model
• JUnit 5 + @BeforeAll/ @AfterAll

Go to step 3: Spring WebFlux