Spring Boot Gradle plugin automatically uses the Kotlin version declared via the Kotlin Gradle plugin . You can now take a deeper look at the generated application.
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Explore the Spring Boot application While Spring Boot looks for a public static main() method, the Kotlin application uses a top-level function defined outside DemoApplication class . The DemoApplication class is not declared as open , since the kotlin-spring plugin does that automatically.1 Ara 2021
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