I have a Kotlin/JVM application. I want to pass a lazily system property in using CommandLineArgumentProvider. But for some reason the property doesn't get set correctly and it's not accessible in the application. Properties set using

systemProperty("...", "...")

work, but these are eager and I want to avoid them. Weirdly when I print all properties in the application they appear under a different property -

sun.java.command=org.example.AppKt -DsecretFile=/Users/dev/my-project/secret-file

. I think it's weird there's an inconsistency. I would expect both approaches to work the same. Also, I think it's weird that logging

commandLine

returns a

null

as the first element:

[:run] running task [null, -DsecretFile=/Users/dev/my-project/secret-file]

plugins {
  kotlin("jvm") version "2.1.20"
  application
}

tasks.run.configure {
  val secretFile = layout.projectDirectory.file("secret-file")
  inputs.file(secretFile)

  argumentProviders += CommandLineArgumentProvider {
    listOf("-DsecretFile=${secretFile.asFile.absoluteFile.invariantSeparatorsPath}")
  }
  systemProperty("secretFileWorks", secretFile.asFile.absoluteFile.invariantSeparatorsPath)
  doFirst {
    println("[$path] running task $commandLine")
  }
}

Gradle version is 8.13

Nah, that's not a bug but PEBCAK. :-)

argumentProviders

is for arguments to your main method, you will find it in your

args

. What you wanted to use is

jvmArgumentProviders

. :-)