分级依赖并不像我期望的那样起作用。

Question

我有两个子项目subproject1和subproject2。我想从subproject2添加一些类到subproject1，并获得subproject1.jar。下面是我的分级文件：

task copyClasses (dependsOn: [  ':subproject1:clean',  ':subproject1:classes']) {
    println "copyClasses "
    doLast {
        Task study = tasks.getByPath(':subproject1:jar')
        study.doFirst {
            copy {
                println "copy ... "
                println sourceSets.main.output.classesDir
                println project(':subproject1').sourceSets.main.output.classesDir
                from sourceSets.main.output.classesDir
                into project(':subproject1').sourceSets.main.output.classesDir
            }
        }
    }
}

task jarUpdated (dependsOn: [ clean, classes, copyClasses, ':subproject1:jar']) {
    doLast {
        println "jarUpdated"
    }
}

但是我得到了如下的构建顺序：

$ gradle jarUpdated
copyClasses
:subproject1:compileJava
:subproject1:processResources UP-TO-DATE
:subproject1:classes
:subproject1:jar
:subproject2:compileJava
:subproject2:processResources UP-TO-DATE
:subproject2:classes
:subproject2:clean
:subproject1:clean
:subproject2:copyClasses
Calling Task.doFirst(Closure) after task execution has started has been deprecated and is scheduled to be removed in Gradle 2.0. Check the configuration of task ':subproject1:jar'.
:subproject2:jarUpdated
jarUpdated

BUILD SUCCESSFUL

我的期望是：

$ gradle jarUpdated
:subproject2:clean 
:subproject2:compileJava
:subproject2:processResources UP-TO-DATE
:subproject2:classes
:subproject1:clean 
:subproject1:compileJava
:subproject1:processResources UP-TO-DATE
:subproject2:copyClasses
copyClasses
copy ... 
:subproject1:jar 
:subproject2:jarUpdated
jarUpdated

BUILD SUCCESSFUL

请你提出建议或指出我错过了什么？非常感谢!

Answer 1

您所要求的“最简单”的方法可能是在您的subproject1构建文件中这样做。

jar {
  from  tasks.getByPath(':subproject2:compileJava')
}

然而，这是一种非常简单的方法，有很多警告，例如

• 子项目1不能针对子项目2类进行编译。
• 子项目2的依赖项将不包括在内。
• 等

实际上，我建议将subproject2声明为subproject1的依赖项，并使用Peter建议的插件之一。