路径配置正确但Gradle提示无法解析processor-api项目

项目目录结构 #

├── build.gradle.kts
├── processor
│   ├── build.gradle.kts
├── processor-api
│   ├── build.gradle.kts
├── settings.gradle.kts
└── src
    ├── main
    └── test

各模块配置文件 #

processor模块 build.gradle.kts #

plugins {
    `java-library`
    kotlin("jvm") version "1.9.10"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

//buildscript {
//    dependencies {
//        classpath(kotlin("gradle-plugin", version = "1.9.10"))
//    }
//}

dependencies {
    implementation(project(":processor-api"))
    implementation("com.google.devtools.ksp:symbol-processing-api:1.9.10-1.0.13")
}

tasks.test {
    useJUnitPlatform()
}

processor-api模块 build.gradle.kts #

plugins {
    kotlin("jvm") version "1.9.10"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

主模块 build.gradle.kts #

plugins {
    kotlin("jvm") version "1.9.10"
    id("com.google.devtools.ksp") version "1.9.10-1.0.13"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

dependencies {
    implementation(project(":processor-api"))
    ksp(project(":processor"))
    testImplementation("org.jetbrains.kotlin:kotlin-test:1.9.10")
}

tasks.test {
    useJUnitPlatform()
}

kotlin {
    jvmToolchain(8)
    sourceSets.main {
        kotlin.srcDir("build/generated/ksp/main/kotlin")
    }
    sourceSets.test {
        kotlin.srcDir("build/generated/ksp/test/kotlin")
    }
}

settings.gradle.kts #

rootProject.name = "leetcode-kotlin"
include("processor", "processor-api")

编译错误日志 #

Could not determine the dependencies of task ':compileJava'.
> Could not resolve all task dependencies for configuration ':compileClasspath'.
   > Could not resolve project :processor-api.
     Required by:
         project :
      > No matching variant of project :processor-api was found. The consumer was configured to find a library for use during compile-time, compatible with Java 8, preferably in the form of class files, preferably optimized for standard JVMs, and its dependencies declared externally, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm' but:
          - Variant 'apiElements' capability org.example:processor-api:1.0-SNAPSHOT declares a library for use during compile-time, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm':
              - Incompatible because this component declares a component, compatible with Java 17 and the consumer needed a component, compatible with Java 8
          - Variant 'mainSourceElements' capability org.example:processor-api:1.0-SNAPSHOT declares a component, and its dependencies declared externally:
              - Incompatible because this component declares a component of category 'verification' and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about its target Java version (required compatibility with Java 8)
                  - Doesn't say anything about its elements (required them preferably in the form of class files)
                  - Doesn't say anything about its usage (required compile-time)
                  - Doesn't say anything about org.jetbrains.kotlin.platform.type (required 'jvm')
          - Variant 'runtimeElements' capability org.example:processor-api:1.0-SNAPSHOT declares a library for use during runtime, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm':
              - Incompatible because this component declares a component, compatible with Java 17 and the consumer needed a component, compatible with Java 8
          - Variant 'testResultsElementsForTest' capability org.example:processor-api:1.0-SNAPSHOT:
              - Incompatible because this component declares a component of category 'verification' and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about how its dependencies are found (required its dependencies declared externally)
                  - Doesn't say anything about its target Java environment (preferred optimized for standard JVMs)
                  - Doesn't say anything about its target Java version (required compatibility with Java 8)
                  - Doesn't say anything about its elements (required them preferably in the form of class files)
                  - Doesn't say anything about its usage (required compile-time)
                  - Doesn't say anything about org.jetbrains.kotlin.platform.type (required 'jvm')

原因分析 #

错误核心在于版本不兼容：主模块指定了Java 8工具链，但processor-api未配置Java版本，默认使用Java 17编译，导致Gradle无法匹配到兼容的依赖变体。另外processor-api未应用java-library插件，作为被其他模块依赖的库，这会影响Gradle生成正确的依赖发布变体。

解决方案 #

1. 修改processor-api模块配置 #

添加java-library插件并统一Java 8工具链：

plugins {
    `java-library`
    kotlin("jvm") version "1.9.10"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

kotlin {
    jvmToolchain(8)
}

2. 修改processor模块配置 #

同样添加Java 8工具链配置，保证全模块版本统一：

plugins {
    `java-library`
    kotlin("jvm") version "1.9.10"
}

group = "org.example"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

dependencies {
    implementation(project(":processor-api"))
    implementation("com.google.devtools.ksp:symbol-processing-api:1.9.10-1.0.13")
}

tasks.test {
    useJUnitPlatform()
}

kotlin {
    jvmToolchain(8)
}

完成以上修改后，所有模块统一使用Java 8编译，processor-api作为标准Java库提供正确的依赖变体，主模块即可正常解析依赖并完成编译。

内容的提问来源于stack exchange，提问作者Dj Sushi