如何在Gradle中支持多语言（Java和Scala）中的多个项目？

Question

我想将我们过时的Ant构建转换为Gradle。该项目包含Java 50子项目和10个Scala子项目。 Java项目只包含Java和Scala项目，只包含Scala。每个项目都是由Java构建，然后是Scala，这大大减缓了我们的构建。

我想尽可能多的公共逻辑放在根目录的build.gradle文件可能看起来像这样：

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 
    } 
} 

当我运行我的体型，我得到下面的输出中，请注意:esb-server:compileJava和:esb-server:compileScala包含相同的警告，所以类正在建造两次。另请注意，所有其他项目包含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 

我知道这两个apply plugin线在我的根build.gradle顶部导致此行为。但是，如果我只将正确的插件应用于每个子项目，我无法将通用配置重构为我的根build.gradle。另一种方法是只使用Scala插件来处理所有事情，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，并且仍然可以将我的所有项目的常见构建配置重构为根build.gradle？在Gradle中支持多种语言的最佳方式是什么？

Answer 1

怎么是这样的：

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

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

因为你的src目录是 'src' 中，需要封盖内的一些其他鉴别机制