kotlin - Koin not able to inject service - Stack Overflow

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I downloaded a ktor setup with koin enabled, but I can't seem to get it work. Not sure if I am doing something wrong or not, as it on the surface looks pretty OK to me.

so my Applikation.kt file looks like this

fun main(args: Array<String>) {
    io.ktor.serverty.EngineMain.main(args)
}

fun Application.module() {
    configureFrameworks()
    configureSerialization()
    configureDatabases()
    configureMonitoring()
    configureSecurity()
    configureRouting()
    configureUserRoutes()
}

the configure frameworks function:

fun Application.configureFrameworks() {
    install(Koin) {
        slf4jLogger()
        modules(module {
            single<Connection> {
                connectToPostgres(embedded = true)
            }
            single<UserService> {
                UserService(get())
            }
        })
    }
}

and configureUserRoutes()

fun Application.configureUserRoutes() {
    routing {
        val koin = getKoin()
        val userService: UserService = koin.get()
        get("/login") {
            call.respondText("login?")
        }
        post("/register") {
            log.info("[POST] /register")
            val newUser = call.receive<User>()
            userService.registerUser(newUser)
        }
    }
}

have I missunderstood something or shouldn't that inject of UserService work?

I am just getting this error

Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface io.ktor.server.routing.Routing, but class was expected
    at .koin.ktor.ext.RoutingExtKt.getKoin(RoutingExt.kt:74)

I downloaded a ktor setup with koin enabled, but I can't seem to get it work. Not sure if I am doing something wrong or not, as it on the surface looks pretty OK to me.

so my Applikation.kt file looks like this

fun main(args: Array<String>) {
    io.ktor.serverty.EngineMain.main(args)
}

fun Application.module() {
    configureFrameworks()
    configureSerialization()
    configureDatabases()
    configureMonitoring()
    configureSecurity()
    configureRouting()
    configureUserRoutes()
}

the configure frameworks function:

fun Application.configureFrameworks() {
    install(Koin) {
        slf4jLogger()
        modules(module {
            single<Connection> {
                connectToPostgres(embedded = true)
            }
            single<UserService> {
                UserService(get())
            }
        })
    }
}

and configureUserRoutes()

fun Application.configureUserRoutes() {
    routing {
        val koin = getKoin()
        val userService: UserService = koin.get()
        get("/login") {
            call.respondText("login?")
        }
        post("/register") {
            log.info("[POST] /register")
            val newUser = call.receive<User>()
            userService.registerUser(newUser)
        }
    }
}

have I missunderstood something or shouldn't that inject of UserService work?

I am just getting this error

Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface io.ktor.server.routing.Routing, but class was expected
    at .koin.ktor.ext.RoutingExtKt.getKoin(RoutingExt.kt:74)

• kotlin
• ktor
• koin

Share Follow asked Mar 6 at 20:38 munHungermunHunger 3,06177 gold badges4343 silver badges7373 bronze badges

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1 Answer 1

Sorted by: Reset to default 0

aha, so I can't use koin inside the routing scope

this works (but not entirely sure why I can't inject inside routing):

fun Application.configureUserRoutes() {
    val koin = getKoin()
    val userService: UserService = koin.get()
    routing {
        get("/login") {
            call.respondText("login?")
        }
        post("/register") {
            log.info("[POST] /register")
            val newUser = call.receive<User>()
            userService.registerUser(newUser)
        }
    }
}

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