java - 如何从父项目定义 Gradle kotlin dsl 中的公共(public)依赖项？

Question

我正在使用 Kotlin DSL 设置多模块 Gradle 构建。下面是我正在使用的顶级 build.gradle.kts 文件。

subprojects {
    repositories {
        mavenCentral()
    }

    group = "com.example"
    version = "1.0.0"

    plugins.withType<JavaPlugin> {
        extensions.configure<JavaPluginExtension> {
            sourceCompatibility = JavaVersion.VERSION_11
            targetCompatibility = JavaVersion.VERSION_11

            dependencies {
                implementation(platform("org.springframework.boot:spring-boot-dependencies:2.2.2.RELEASE"))
            }

            tasks.withType<Test> {
                useJUnitPlatform()
            }
        }
    }
}

我得到以下错误

* What went wrong:
Script compilation error:

  Line 15:                 implementation(platform("org.springframework.boot:spring-boot-dependencies:2.2.2.RELEASE"))
                           ^ Unresolved reference: implementation

1 error

问题

• 如何从根 build.gradle.kts 设置公共(public)依赖项？

Answer 1

我建议您阅读 Gradle Kotlin DSL Primer . “了解类型安全模型访问器何时可用”部分解释了为什么您不应期望在此处定义实现(强调我的):

The set of type-safe model accessors available is calculated right before evaluating the script body, immediately after the plugins {} block. Any model elements contributed after that point do not work with type-safe model accessors. For example, this includes any configurations you might define in your own build script.

因此，您不能在顶级 build.gradle 中为 implementation 使用类型安全访问器，除非您要应用 java 插件在其 plugins{} block 中(不建议这样做，除非根项目本身包含源)。

相反，使用不安全的访问器，如 Understanding what to do when type-safe model accessors are not available 部分所示，像这样:

plugins.withType<JavaPlugin> {
        extensions.configure<JavaPluginExtension> {
            sourceCompatibility = JavaVersion.VERSION_11
            targetCompatibility = JavaVersion.VERSION_11

            dependencies {
                "implementation"(platform("org.springframework.boot:spring-boot-dependencies:2.2.2.RELEASE"))
            }

            tasks.withType<Test> {
                useJUnitPlatform()
            }
        }
    }