子模块项目不能作为依赖项供消费者使用 - Kotlin Gradle DSL

Question

So I have a multi-module project, error-handling. Where I have a common lib that contains some classes that are used by the lib that I publish, but also I would like to expose that entire lib to the consumers. This is the structure:

 Example:
 error-handling-lib                       ## root
    ├── error-handling-common             ## Common lib, compiled to JS/JVM
    │   └─── build.gradle.kts
    │
    ├── error-handling-lib-jvm            ## JVM specific lib 
    │   └── error-handling-lib-ktor       ## KTOR specific - !final! 
    │       │ 
    │       └── build.gradle.kts              ## Build all framework-specific versions

error-handling-common has the following build.gradle.kts

plugins {
    id ("java-library")
    kotlin("jvm") version "1.6.20"
    id("org.jlleitschuh.gradle.ktlint") version "10.2.1"
    id("org.jlleitschuh.gradle.ktlint-idea") version "10.2.1"
}

repositories {
    mavenCentral()
}

dependencies {
    // CORE
    implementation("io.ktor:ktor-server-core:$ktorVersion")
    implementation("io.ktor:ktor-serialization-kotlinx-json:$ktorVersion")

    // TEST DEPENDENCIES
    testImplementation("org.mockito.kotlin:mockito-kotlin:4.0.0")

    // KOTEST
    testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")
    testImplementation("io.kotest:kotest-runner-junit5:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-json:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-json:$kotestVersion")
    testImplementation("io.kotest.extensions:kotest-assertions-ktor:$kotestKtorAssertionVersion")
    testImplementation("io.kotest.extensions:kotest-extensions-koin:$kotestKoinExtVersion")
}

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
    kotlinOptions {
        jvmTarget = "17"
        freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
    }
}

error-handling-lib-ktor

plugins {
    id("java-library")
    kotlin("jvm") version "1.6.20"
    id("org.jlleitschuh.gradle.ktlint") version "10.2.1"
    id("org.jlleitschuh.gradle.ktlint-idea") version "10.2.1"
    id("maven-publish")
    id("com.google.cloud.artifactregistry.gradle-plugin") version "2.1.5"
}

repositories {
    mavenCentral()
    maven {
        url = uri("artifactregistry://......./maven-app-libraries")
    }
}

dependencies {
    // CORE
    api(project(":error-handling-common"))
    implementation("io.ktor:ktor-server-core:$ktorVersion")
    implementation("io.ktor:ktor-server-auto-head-response:$ktorVersion")
    implementation("io.ktor:ktor-server-status-pages:$ktorVersion")
    implementation("io.ktor:ktor-server-cors:$ktorVersion")
    implementation("io.ktor:ktor-server-call-logging:$ktorVersion")
    implementation("io.ktor:ktor-serialization-kotlinx-json:$ktorVersion")

    // TESTS
    testImplementation("io.insert-koin:koin-test:$koinVersion")
    testImplementation("io.ktor:ktor-server-netty:$ktorVersion")
    testImplementation("io.ktor:ktor-server-tests:$ktorVersion")
    testImplementation("io.ktor:ktor-server-test-host:$ktorVersion")

    // TEST DEPENDENCIES
    testImplementation("org.mockito.kotlin:mockito-kotlin:4.0.0")

    // KOTEST
    testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")
    testImplementation("io.kotest:kotest-runner-junit5:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-json:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")
    testImplementation("io.kotest:kotest-assertions-json:$kotestVersion")
    testImplementation("io.kotest.extensions:kotest-assertions-ktor:$kotestKtorAssertionVersion")
    testImplementation("io.kotest.extensions:kotest-extensions-koin:$kotestKoinExtVersion")
}

tasks.getByName<Test>("test") {
    useJUnitPlatform()
}

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
    kotlinOptions {
        jvmTarget = "17"
        freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
    }
}

Unfortunately with the API dependency, I'm not getting the job done. Any ideas why this is happening?

Answer 1

api(project(...)) is not sufficient, you also need to actually publish that other project.

api just means that consumers won't need to explicitly add a dependency on that other module, but it still needs to exist in the maven repository.

Another option would be to manually add all the compiled files from the common module into the library's jar, but that is hacky and shouldn't be necessary if you just publish the common module independently.