How do I specify a Kotlin function as the `mainClassName` in the `springBoot` section of the build.g...

# spring

[Dave Jensen]

How do I specify a Kotlin function as the mainClassName in the springBoot section of the build.gradle.kts? (The rest of the details in the thread)

[Dave Jensen]

First, I'm using Windows. 😞 I'm also using the setup in the Spring Boot Kotlin tutorial (https://spring.io/guides/tutorials/spring-boot-kotlin/). I ran into a bunch of issues when the classpath/filename became too large.

My Application looks exactly like this (but different names of course)

package <http://com.example.blog|com.example.blog>

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

@SpringBootApplication
class BlogApplication

fun main(args: Array<String>) {
  runApplication<BlogApplication>(*args)
}

This used to work fine. However, because of the Windows issue, I needed to use the id("com.github.ManifestClasspath") version "0.1.0-RELEASE" plugin. In doing that, I got this Main class name has not been configured and it could not be resolved.

[Dave Jensen]

I'm fairly certain I need to use:

springBoot {
    mainClassName = ""
}

However, since the main is a Kotlin function, how do I specify that here?

[viralshah]

mainClassName = "com.example.my.ApplicationKt"

That Kt part is necessary so it will be whatever your class name is + ‘Kt’

[Dave Jensen]

Thank you @viralshah! It worked.

[Dave Jensen]

Well, I got further than I did before anyway. 🙂

[viralshah]

what’s wrong

[Dave Jensen]

It might be an application error (i.e., I caused it). Still investigating.

[viralshah]

good luck 🤞

[Dave Jensen]

Yup, just something on my side. Fix it. It all works. Thanks again!