如何在Gradle中支持多語言（Java和Scala）中的多個項目？

Question

我想將我們過時的Ant構建轉換爲Gradle。該項目包含Java 50子項目和10個Scala子項目。 Java項目只包含Java和Scala項目，只包含Scala。每個項目都是由Java構建，然後是Scala，這大大減緩了我們的構建。

我想盡可能多的公共邏輯放在根目錄的build.gradle文件可能看起來像這樣：

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 
    } 
} 

當我運行我的體型，我得到下面的輸出中，請注意:esb-server:compileJava和:esb-server:compileScala包含相同的警告，所以類正在建造兩次。另請注意，所有其他項目包含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 

我知道這兩個apply plugin線在我的根build.gradle頂部導致此行爲。但是，如果我只將正確的插件應用於每個子項目，我無法將通用配置重構爲我的根build.gradle。另一種方法是隻使用Scala插件來處理所有事情，但這是最好的方法嗎？

我可以使用Java插件編譯Java項目和Scala插件來編譯Scala項目，並且仍然可以將我的所有項目的常見構建配置重構爲根build.gradle？在Gradle中支持多種語言的最佳方式是什麼？

Answer 1

怎麼是這樣的：

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

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

因爲你的src目錄是 'src' 中，需要封蓋內的一些其他鑑別機制