How do I make the fat jar built by ktor runnable? Trying to run it only gives `Error: Could not find...

# ktor

[Kaj Koivunen]

How do I make the fat jar built by ktor runnable? Trying to run it only gives Error: Could not find or load main class ktortest-all.jar

[Casey Brooks]

It looks like the jar is trying to run with the artifact name as the main class. You need to specify an actual JVM class name in your build.gradle.kts file.

For example, if your application has your fun main() in a file at src/main/com/example/application.kt, the class name will be com.example.ApplicationKt

https://ktor.io/docs/fatjar.html#build

[Fernando Sanchez (Perraco Labs)]

did you add next to your build Gradle file?

application {
    mainClass.set("your_package.ApplicationKt")
}

where ApplicationKt is the file where the main is defined