如何在Gradle中支持多种语言(Java和Scala)的多个项目？

我正在尝试将过时的Ant构建转换为Gradle.该项目包含大约Java 50子项目和10个Scala子项目. Java项目仅包含Java,Scala项目仅包含Scala.每个项目都是由Java和Scala构建的,这大大减慢了我们的构建速度.

我想在root build.gradle文件中放置尽可能多的通用逻辑,如下所示：

subprojects {
    apply plugin: 'java'
    apply plugin: 'scala'

    sourceCompatibility=1.7
    targetCompatibility=1.7

    sourceSets {
        main {
            scala {
                srcDir 'src'
            }
            java {
                srcDir 'src'
            }
        }
        test {
            scala {
                srcDir 'test'
            }
            java {
                srcDir 'test'
            }
        }
    }

    repositories {
        mavenCentral()
    }

    dependencies {
        scalaTools "org.scala-lang:scala-compiler:2.9.3"
        compile "org.scala-lang:scala-library:2.9.3"
    }

    // Use the sbt compiler (not scalac ant task)
    tasks.withType(ScalaCompile) {
        scalaCompileOptions.useAnt = false
    }

    task showCompileClasspath << {
       sourceSets.main.compileClasspath.each { println it }
    }

    test {
        systemProperty "user.dir", projectDir
    }
}

当我运行我的构建时,我得到以下输出,请注意：esb-server：compileJava和：esb-server：compileScala包含相同的警告,因此这些类正在构建两次.另请注意,每个其他项目都包含compileJava和compileScala

:common:assemble
:esb-server:compileJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
:esb-server:compileScala
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
:esb-server:processResources UP-TO-DATE
:esb-server:classes
:esb-server:jar
:esb-server:assemble
:plugins:compileJava UP-TO-DATE
:plugins:compileScala UP-TO-DATE
:plugins:processResources UP-TO-DATE
:plugins:classes UP-TO-DATE
:plugins:jar
:plugins:assemble
:raas-transform:assemble
:saxonee-helper:assemble
:scala-common:compileJava UP-TO-DATE
:scala-common:compileScala
/Users/iain.hull/code/trunk/ccdev/scala-common/src/com/workday/esb/assembly/audit/TreeAudit.scala:138: method first in trait IterableLike is deprecated: use `head' instead
    override def getLast():Option[AuditNode] = if (children.isEmpty) None else children.first.getLast
                                                                                        ^
one warning found
:scala-common:processResources UP-TO-DATE
:scala-common:classess
:scala-common:jar
:scala-common:assemble
:plugins:hibernatepersistence:compileJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
:plugins:hibernatepersistence:compileScala
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
:plugins:hibernatepersistence:processResources
:plugins:hibernatepersistence:classes
:plugins:hibernatepersistence:jar
:plugins:hibernatepersistence:assemble

我知道在我的根build.gradle顶部的两个应用插件行导致了这种行为.但是,如果我只将正确的插件应用于每个子项目,我无法将常用配置重构为我的根build.gradle.另一种方法是只使用Scala插件,但这是最好的方法吗？

我可以使用Java插件编译Java项目和Scala插件来编译Scala项目,还是将所有项目的公共构建配置重构为root build.gradle吗？在Gradle中支持多种语言的最佳方法是什么？

解决方法:

这样的事情怎么样：

configure(subprojects.findAll {project  ->
    file('src/main/java').exists()
}) {
    apply plugin: 'java'
}

configure(subprojects.findAll {project  ->
    file('src/main/scala').exists()
}) {
    apply plugin: 'scala'
}

因为您的源目录是src,所以需要在闭包内部使用其他一些鉴别器机制.