Hi, I have a fat jar file that I've created with k...

# ktor

[Mark Fisher]

Hi, I have a fat jar file that I've created with kvision that contains my ktor 3.0 application.
When I run it, it's starting the right class, but the application.conf file isn't being read, so it fails to get any configuration.

My starting function (in /bw/App.kt) is:

fun main() = runBlocking {
    logger.info("Starting Bouncy World Service at ${Date()}")
    val env = applicationEnvironment {
        config = ApplicationConfig("application.conf")
    }
    val worldConfig = WorldConfig(env.config)
    val world = WorldFactory.create(worldConfig)

I can see and have validated the application.conf file in the root of the jar folder.
When starting up, I see the logger information, but the instantiation of worldConfig fails, because there's nothing in env.config (I print out the keys in the init section of WorldConfig, and it's showing an empty list).

My gradle build has the main class set with:

jvm {
        @OptIn(ExperimentalKotlinGradlePluginApi::class)
        mainRun {
            mainClass.set("bw.AppKt")
        }

This works fine outside a jar file invocation (i.e. clicking the start button in IntelliJ for the application) i.e. via:

jvmRun -DmainClass=bw.AppKt --quiet

Can anyone suggest why the config isn't being read when running the application via

java -jar path/to/my.jar

I tried adding -conf param, but as I'm not using the EngineMain to create the server, it's not doing anything.

[Mark Fisher]

After debugging this for a while, it appears the io.ktor.server.config.HoconConfigLoader is not available when running by the jar, but only when run from the IDE.
Does anyone know how to get that to load in the jar too?

[Mark Fisher]

I can see io/ktor/server/config/HoconConfigLoader.class exists in the fat jar. Now just need to know why it's not registering

[Mark Fisher]

The jar's io.ktor.server.config.ConfigLoader file only contains:

io.ktor.server.config.yaml.YamlConfigLoader

and not

io.ktor.server.config.HoconConfigLoader

[Mark Fisher]

I was loading ktor-server-config-yaml-jvm as a dependency, if I remove it, then the HoconConfigLoader is included.

Does anyone know how to include both?

[Aleksei Tirman [JB]]

The HoconConfigLoader class is part of the ktor-server-core package, so it should be loaded anyway. Do you plan to use the YAML or the HOCON configuration?

[Mark Fisher]

I'm actually just using HOCON for the main config at the moment, but was trying out YAML too, noticed that in the IDE via "jvmRun" both work, but when using a JAR, the HoconConfigLoader isn't loaded, only the YAML one is. I've also raised this in the #CL4C1SLKC channel.

[Aleksei Tirman [JB]]

As a workaround, you can try to use the HoconConfigLoader class directly to load the config.

[Mark Fisher]

Thanks. I've removed the YAML, it's a small project, and I'm not using that.
I'm unsure though why only one of them is getting registered. Feels like it's somewhere in the building of the jar (using shadowJar from kvision's gradle plugin) or if the ktor fatJar task would instead get it correct (but then wouldn't build the Web App for kvision)