Railways is not injecting env vars at runtime into my ktor application
nickbeginner
HOBBYOP

8 months ago

Hello i'm building and deploying this docker file:

# ---- Build Stage ---- FROM eclipse-temurin:21-jdk AS build WORKDIR /app COPY . . RUN ./gradlew clean shadowJar # ---- Run Stage ---- FROM eclipse-temurin:21-jre WORKDIR /app COPY --from=build /app/build/libs/displate-mail.jar app.jar RUN useradd ktoruser USER ktoruser EXPOSE 8080 ENTRYPOINT ["java", "-jar", "app.jar"]

but the deploy keep failing this this error

at io.ktor.server.engine.CommandLineKt.commandLineEnvironment(CommandLine.kt:98)

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at io.ktor.server.netty.EngineMain.main(EngineMain.kt:20)

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Exception in thread "main" java.util.NoSuchElementException: Char sequence is empty.

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at kotlin.text.StringsKt___StringsKt.first(_Strings.kt:76)

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at io.ktor.server.config.yaml.YamlConfigKt.resolveValue(YamlConfig.kt:173)

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at io.ktor.server.config.yaml.YamlConfigKt.access$resolveValue(YamlConfig.kt:1)

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at io.ktor.server.config.yaml.YamlConfig.checkEnvironmentVariables$check(YamlConfig.kt:132)

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at io.ktor.server.config.yaml.YamlConfig.checkEnvironmentVariables$check(YamlConfig.kt:134)

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at io.ktor.server.config.yaml.YamlConfig.checkEnvironmentVariables$check(YamlConfig.kt:134)

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at io.ktor.server.config.yaml.YamlConfig.checkEnvironmentVariables$check(YamlConfig.kt:134)

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at io.ktor.server.config.yaml.YamlConfig.checkEnvironmentVariables(YamlConfig.kt:139)

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at io.ktor.server.config.yaml.YamlConfigJvmKt.configFromString(YamlConfigJvm.kt:39)

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seems that env vars are not injected

Solved

5 Replies

nickbeginner
HOBBYOP

8 months ago

If i hardcode values, for example like this (with dummies values)

ktor: deployment: port: 8080 development: true auth: apiKey: internal: "S2Levonh3AWRYdPkQiNwLsF2YYTSHJVJNEnxW5GMuJCyTe42j9LyDuau3R5vcpZyCzCwuv" providers: mailgun: user: "admin" apiKey: "S2Levonh3AWRYdPkQiNwLsF2YYTSHJVJNEnxW5GMuJCyTe42j9LyDuau3R5vcpZyCzCwuv" endpoint: "https://default.mailgun.endpoint"

the service is deployed withous issues

nickbeginner
HOBBYOP

8 months ago

i need an answer since we are deciding if we want to host our infrastructure on railways since we have a lot of microservices written using ktor

nickbeginner
HOBBYOP

8 months ago

could the issue be related to this

https://docs.railway.com/guides/start-command

?

nickbeginner
HOBBYOP

8 months ago

solved, for reference, if you declare env variables without using {}, everything working fine:

ktor: deployment: port: $PORT development: $IS_DEV auth: apiKey: internal: $AUTH_API_KEY_INTERNAL providers: mailgun: user: $MAILGUN_USER apiKey: $MAILGUN_API_KEY endpoint: $MAILGUN_ENDPOINT

thanks anyways!

uxuz
MODERATOR

8 months ago

I am glad you have solved the issue, I'll mark this thread as solved.

Status changed to Solved uxuz • 8 months ago

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