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kotlinlang

I need to pass a JVM arg to task desktopRun of type KotlinRunJvm. But I'm struggling to think of how,

I tried to find the tasks with type, but get this error.
This API is not intended to be used outside of JetBrains / outside the Kotlin Gradle Plugin

```tasks.withType&lt;KotlinJvmRun&gt; {
    jvmArgs = "-DmainClass=MainKt"
}```


`tasks.withType&lt;...&gt; { ... }` is bad anyway as you break task-configuration avoidance, but instead `tasks.withType&lt;...&gt;.configureEach { ... }` should be used.

Besides that, if you shouldn't use `KotlinJvmRun`, you should probably instead use its supertype `JavaExec`.

Besides that with both you configure all tasks of that type, so you should probably more do `tasks.withType&lt;JavaExec&gt;().named { it == "desktopRun" }.configureEach { ... }`

That's perfect :slightly_smiling_face: but I've tried many things and args are not being passed through, it works when invoking gradle with args though

What do you mean by "it works when invoking gradle with args though"?

shared:desktopRun -DmainClass=com.timerx.MainKt

Well, that is not nearly the same thing.
With that you are setting a system property for Gradle.
With the other config you are setting a system property for the JVM started by that task.
Those have nothing to do with each other besides that one starts the other.

Ah gotcha, I tried this with no luck

```tasks.withType&lt;JavaExec&gt;().named { it == "desktopRun" }.configureEach {
        systemProperty("mainClass", "MainKt")```


You set a system property for the process run by  `desktopRun` just that you now use the DSL

This still has nothing to do with the system property you set for the Gradlebuild on the commandline

And don't now get the idea to do `System.setProperty` in the `configureEach`, even if that works somehow, it will not really do what you want and just make your build flaky

Just tried it for fun, and it didn't work, so not that much fun in the end

or, not properly, however you want to call it

Awesome, thanks for the help :slightly_smiling_face: I do appreciate it ... I won't do it

You set this system property now whenever the `desktopRun` task is configured.
For example imagine that you also have a `desktopRun2` task where you need a different value, so you do the same non-sense.
Then you run Gradle like `./gradlew desktopRun desktopRun2`.
Both task get configured.
The System property is set to the value that was configured while configuring the second task and is like that for the whole Gradle invocation.

Thanks for the explanation, makes lots of sense

Solution is obvious in the end haha thanks <@U0152P3VB5J>
tasks.withType&lt;JavaExec&gt;().named { it == "desktopRun" }.configureEach { mainClass = "MainKt"}