Koin incompatible with Ktor 3.0+

[JesusHzC]

Describe the bug
by inject crash when is used on Routing configuration

To Reproduce
Steps to reproduce the behavior:

1. Go to routing configuration on ktor
2. Inject any object, use by inject()
3. Run server
4. Execute route

Expected behavior
Provide object injected

Koin module and version:
[e.g]: koin-ktor:3.5.6

[arnaudgiuliani]

Already deployed in Koin 4.1 (beta)

[123niel]

Hi,

we are using Koin and Ktor in production and are hesitant to use a beta version.
As there are quite some open issues attached to the 4.1 Milestone, we wonder how soon a stable version will be available to use with Ktor 3?

[eman1986]

I believe I saw end of Q1 4.1 will be out of beta, which should be soon. I'm using the beta version and it has been working with issue for me, but I agree I prefer not using a beta version of a library if I can help it on production code, but sometimes it can't be helped.

[alexxarisis]

Confirmed, I can also reproduce it with:
Koin 4.1.0-Beta7
Kotlin 2.1.20
Ktor 3.1.2

Error: java.lang.IncompatibleClassChangeError: Found interface io.ktor.server.routing.Routing, but class was expected

[oqx]

The Beta7 version fixed it for me, though I had to update the package from io.insert-koin:koin-ktor to io.insert-koin:koin-ktor3 (note the 3).

// libs.versions.toml

[versions]
// ...
koin = "4.1.0-Beta7"

[libraries]
// ...
koin-ktor = { module = "io.insert-koin:koin-ktor3", version.ref = "koin" }
koin-logger = { module = "io.insert-koin:koin-logger-slf4j", version.ref = "koin" }

[b24nguyen]

Still encountering the error on 4.1.0-Beta7

With these lib versions
koin-ktor3 4.1.0-Beta7
ktor 3.1.2
kolin 2.1.10

What version of ktor are you using @oqx

[rvp-diconium]

To whom it might concern, you can work around the crash by accessing Koin from the Application object:

• before:

fun Route.installFoo() {
    val foo by inject<Foo>()
    ...
}

• after:

inline fun <reified T : Any> Route.bar(): Lazy<T> {
    return lazy { this.application.getKoin().get<T>() }
}

fun Route.installFoo() {
    val foo by bar<Foo>()
    ...
}

[arnaudgiuliani]

anyone can help reproduce IncompatibleClassChangeError?

[alexxarisis]

The Beta7 version fixed it for me, though I had to update the package from io.insert-koin:koin-ktor to io.insert-koin:koin-ktor3 (note the 3).

// libs.versions.toml

[versions]
// ...
koin = "4.1.0-Beta7"

[libraries]
// ...
koin-ktor = { module = "io.insert-koin:koin-ktor3", version.ref = "koin" }
koin-logger = { module = "io.insert-koin:koin-logger-slf4j", version.ref = "koin" }

This fixed it for me

[GoldTest]

The Beta7 version fixed it for me, though I had to update the package from io.insert-koin:koin-ktor to io.insert-koin:koin-ktor3 (note the 3).

// libs.versions.toml

[versions]
// ...
koin = "4.1.0-Beta7"

[libraries]
// ...
koin-ktor = { module = "io.insert-koin:koin-ktor3", version.ref = "koin" }
koin-logger = { module = "io.insert-koin:koin-logger-slf4j", version.ref = "koin" }

io.insert-koin:koin-ktor3 works for me, koin-version = "4.1.0-Beta7" ktor = "3.1.2" kotlin = "2.1.10"