Running commonTest in a *KMM project*: when I call a function that uses Ktor Client I get this warni...

# ktor

[Daniele B]

Running commonTest in a KMM project:
when I call a function that uses Ktor Client
I get this warning:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See <http://www.slf4j.org/codes.html#StaticLoggerBinder> for further details.

is it normal?

[CLOVIS]

What are your dependencies? You need a logger implementation if you want logging.

[Daniele B]

I just realized that the warning also happens when I run the app normally, not just while testing

[Daniele B]

In commonMain I have this dependency:

implementation("io.ktor:ktor-client-logging:1.5.1")

[Daniele B]

These are all the Ktor dependencies I have in CommonMain:

implementation("io.ktor:ktor-client-core:${Versions.ktor}")
implementation("io.ktor:ktor-client-json:${Versions.ktor}")
implementation("io.ktor:ktor-client-logging:${Versions.ktor}")
implementation("io.ktor:ktor-client-serialization:${Versions.ktor}")

[CLOVIS]

One way to fix that issue:
https://gitlab.com/braindot/clovis/-/blob/master/server/build.gradle.kts

It really depends on which engine you want to use

[CLOVIS]

If you want to go with Log back, you will also need this file: https://gitlab.com/braindot/clovis/-/blob/master/server/src/main/resources/logback.xml

[Daniele B]

I am using Ktor Client on a multiplatform project, on commonMain. It seems logback is JVM only.
So, I don’t think I can add it as a dependency in CommonMain.

[Daniele B]

Is everyone using Ktor Client on Common Main having the same issue?

[CLOVIS]

Oh, the only two times I had this issue were JVM-only projects. Maybe there are other artifacts for other platforms, not sure.

[Daniele B]

I was running an Android app, so that's why

[andylamax]

@Daniele B Yes and that warning is only printed when running on jvm. Other platforms don't get that warning. Adding logback to the jvm and/or android target should solve your problem

[Daniele B]

Yes, I also realized, thanks