Compiler cannot resolve classes in io.ktor.client.

问题:

I'm trying to add logging for Ktor http requests in Android application. According to docs I have to add gradle dependency

implementation "io.ktor:ktor-client-logging:$ktor_version"

and just use this snippet

val client = HttpClient() {
    install(Logging) {
        logger = Logger.DEFAULT
        level = LogLevel.HEADERS
    }
}

Problem is that compiler "ignores" package 'io.ktor.client.features.logging' added as a dependency. What's strange is that JsonFeature (added as similar dependency) works just fine.

install(JsonFeature) { // perfectly works
...
}

install(Logging) { // unresolved reference
...
}

I already checked .jar file that gradle added to the project, it contains all expected classes, I can open them and see the source code, but magically just can't use in my app. After hours of research I guess it may be somehow related to gradle metadata or that logging feature is multiplatform and some additional gradle configuration is required, but unfortunately I'm not a gradle expert.

I tried adding enableFeaturePreview("GRADLE_METADATA") to settings.gradle, but no effect. Even tried to add "-jvm" to dependency.

implementation "io.ktor:ktor-client-logging-jvm:$ktor_version"

With this dependency Android Studio finding package successfully, but fails to compile with following error

More than one file was found with OS independent path 'META-INF/ktor-http.kotlin_module'

Can anyone please clarify how to properly configure dependency for Ktor logger?

回答1:

For the ktor-client-logging you have to have the dependency set for each platform:

commonMain {
    dependencies {
        implementation "ch.qos.logback:logback-classic:1.2.3"
        implementation "io.ktor:ktor-client-logging:$ktor_version"
    }
}

androidMain {
    dependencies {
        implementation "io.ktor:ktor-client-logging-jvm:$ktor_version"
    }
}

iosMain {
    dependencies {
        implementation "io.ktor:ktor-client-logging-native:$ktor_version"
    }
}

as for the meta META-INF/ktor-http.kotlin_module add to the app/build.gradle inside the android {} block:

android {
    packagingOptions {
        exclude 'META-INF/common.kotlin_module'
        exclude 'META-INF/*.kotlin_module'
    }
}