I just deployed my app to heroku, and I’ve created...

# ktor

[Manuel Lorenzo]

I just deployed my app to heroku, and I’ve created a Procfile that points where the scripts are, web: ./build/scripts/myapp but I still see if I run heroku logs --tail this:

2019-09-18T15:43:48.000000+00:00 app[api]: Build started by user <mailto:[e-mail]|[e-mail]>
2019-09-18T15:44:43.005061+00:00 heroku[web.1]: State changed from crashed to starting
2019-09-18T15:44:42.815943+00:00 app[api]: Release v12 created by user <mailto:[e-mail]|[e-mail]>
2019-09-18T15:44:42.815943+00:00 app[api]: Deploy c26b0ff0 by user <mailto:[e-mail]|[e-mail]>
2019-09-18T15:44:46.857033+00:00 heroku[web.1]: Starting process with command `./build/scripts/myapp`
2019-09-18T15:44:48.994734+00:00 heroku[web.1]: State changed from starting to crashed
2019-09-18T15:44:48.978657+00:00 heroku[web.1]: Process exited with status 1
2019-09-18T15:44:48.764617+00:00 app[web.1]: Setting JAVA_TOOL_OPTIONS defaults based on dyno size. Custom settings will override them.
2019-09-18T15:44:48.780285+00:00 app[web.1]: Picked up JAVA_TOOL_OPTIONS: -Xmx300m -Xss512k -XX:CICompilerCount=2 -Dfile.encoding=UTF-8
2019-09-18T15:44:48.927548+00:00 app[web.1]: Error: Could not find or load main class io.ktor.server.netty.EngineMain
2019-09-18T15:45:15.000000+00:00 app[api]: Build succeeded

[cy]

ktor-server-netty is not packaged for some reason

[Manuel Lorenzo]

what do you mean packaged?

[Manuel Lorenzo]

is it correct that in my build.gradle I should have

apply plugin: 'kotlin'
apply plugin: 'application'

mainClassName = "io.ktor.server.netty.EngineMain"

?

[Manuel Lorenzo]

or in the mainClassName I should have my main class?

[cy]

Well, it depends

[cy]

You may do both

[cy]

If you have your own main (not module main) - use it

[cy]

so do you have ktor-server-netty dependency? Do you use application.conf?

[Manuel Lorenzo]

well I have fun main(args: Array<String>): Unit = EngineMain.main(args)

[Manuel Lorenzo]

I have the ktor-server-netty dependency

[Manuel Lorenzo]

ktor {
    deployment {
        port = 8080
        port = ${?PORT}
    }
    application {
        modules = [me.manulorenzo.myApp.main]
    }
}

[cy]

What is scripts/myapp ?

[Manuel Lorenzo]

that’s the script that is generated

[Manuel Lorenzo]

because of the stage gradle task

[Manuel Lorenzo]

if I run it, there’s a generated script there

[cy]

Most likely it doesn't include dependencies jars

[cy]

you probably need a far jar, not sure how to make stage task use it

[Manuel Lorenzo]

interesting

[cy]

See https://ktor.io/servers/deploy/packing/fatjar for fat-jar instuctions

[Manuel Lorenzo]

I was reading a tutorial to generate the jar, from a docker file..

[cy]

after building a fat-jar you need to specify somehow a path to the jar

[cy]

For heroku we have this page https://ktor.io/servers/deploy/hosting/heroku.html

[cy]

but it doesn't describe how to use stage task, sorry

[cy]

Ah I see, it looks like stage task can use Procfile, so simply specify a path to a fat-jar inside of the file

[cy]

The other reason could be that you have wrong dependency scope so it's not added to runtime classpath

[Manuel Lorenzo]

I got it working 🙂

[Manuel Lorenzo]

it looks like the Procfile’s content should point to ./build/install/myapp/bin/myapp, but for some reason that folder was never built

[Manuel Lorenzo]

thanks a lot Sergey