how do I pass a parameter from ```java -jar fat.jar --test="hi"``` to KTOR so I can read inside my r...

# ktor

[Bernhard]

how do I pass a parameter from

java -jar fat.jar --test="hi"

to KTOR so I can read inside my routes

[Aleksei Tirman [JB]]

One way is to pass environment variables and read them with Java.lang.System.getenv method:

TEST=hi java -jar fat.jar

[Sam]

You could also the -P flag to create a custom config property, like mentioned at the bottom of this section: https://ktor.io/docs/configuration-file.html#command-line

[Bernhard]

a related question: I've got this generated application.conf file

ktor {
  deployment {
    port = 8080
  }
}

media {
    dir = "aadfsdf"
}

when I start the server inside intellij, environment.config.propertyOrNull("media.dir") is null

[Bernhard]

so from what I see, you could pass

-P:media.dir=/data

to override this default

[Bernhard]

I'm accessing the config like this:

fun Application.configureRouting() {
    println(environment.config.propertyOrNull("media.dir"))
}

it's always null though

[Bernhard]

is the configuration not parsed yet at that point?

[Aleksei Tirman [JB]]

Can you show the code of the main function?

[Bernhard]

fun main() {
    embeddedServer(Netty, port = 8080, host = "127.0.0.1", module = Application::module)
        .start(wait = true)
}

[Bernhard]

basically the generated main function from intellij

[Bernhard]

hah got it

[Bernhard]

intellij generates an application.conf file in resources that isn't read using the default main function

[Aleksei Tirman [JB]]

The application.conf isn't loaded with that configuration. You need to use EngineMain.

[Aleksei Tirman [JB]]

Yes

[Bernhard]

thank you, that cleared things up 🙂