Gradle：如何在java中以编程方式声明对项目特定配置的依赖关系答案

【问题标题】：Gradle: how to declare a dependency to a specific configuration of a project programatically in javaGradle：如何在java中以编程方式声明对项目特定配置的依赖关系
【发布时间】：2022-01-20 13:46:24
【问题描述】：

按照Simple sharing of artifacts between projects 中描述的设置，我们处于一种特殊情况，即我们有一个生成不同类型 jar 的多模块 gradle 构建，我们希望在配置中声明对这些 jar 的依赖。

dependencies {
    instrumentedClasspath(project(path: ":producer", configuration: 'instrumentedJars'))
}

来自文档的效果很好。

在dependency-tests 项目中，我有一个重现设置的项目（名称不同，但思路相同）。

但我在 Gradle 插件中执行此操作，我希望在 java 中有相同的声明。

DependencyHandler dependencyHandler = project.getDependencies();

// this adds a dependency to the main jar of the 'producer' project:
dependencyHandler.add("instrumentedClasspath", project.getRootProject().findProject(":producer"));

// this is not working:
dependencyHandler.add("instrumentedClasspath", project.getRootProject().findProject(":producer").getConfigurations().getByName("instrumentedJars"));

失败：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':printConf'.
> Could not resolve all dependencies for configuration ':instrumentedJars'.
   > Cannot convert the provided notation to an object of type Dependency: configuration ':producer:instrumentedJars' artifacts.
     The following types/formats are supported:
       - Instances of Dependency.
       - String or CharSequence values, for example 'org.gradle:gradle-core:1.0'.
       - Maps, for example [group: 'org.gradle', name: 'gradle-core', version: '1.0'].
       - FileCollections, for example files('some.jar', 'someOther.jar').
       - Projects, for example project(':some:project:path').
       - ClassPathNotation, for example gradleApi().
     
     Comprehensive documentation on dependency notations is available in DSL reference for DependencyHandler type.

* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

【问题讨论】：

标签： java gradle dependencies

【解决方案1】：

project(...)

dependencies 块内来自DependencyHandler，并且

path: ":producer", configuration: 'instrumentedJars'

实际上是一张地图 {"path"=":producer", "configuration"="instrumentedJars"}。

所以类似的东西应该可以在 Java 中工作：

Map<String, String> map = new HashMap<>();
map.put("path", ":producer"); 
map.put("configuration", "instrumentedJars");
dependencyHandler.add("instrumentedClasspath", dependencyHandler.project(map));

注意：使用 Kotlin 构建脚本时，您可以轻松查看函数的类型和声明，并且可能更容易发现 API。所以在 Kotlin 中 project(...) 块中的 dependencies 是一个扩展方法，定义为：

fun DependencyHandler.project(
    path: String,
    configuration: String? = null
): ProjectDependency =
    uncheckedCast(
        project(
            if (configuration != null) mapOf("path" to path, "configuration" to configuration)
            else mapOf("path" to path)
        )
    )

【讨论】：