我有一个基于Java的Play &Akka项目是用SBT构建的，有没有办法告诉SBT在构建项目时运行Javadoc而不是Scaladoc ?SBT文档说
"如果项目中只有Java源代码，sbt将运行javadoc。如果有Scala源代码，sbt将运行scaladoc。"
，项目中没有Scala文件，但Scaladoc仍在运行。我认为这是因为Play插件在编译发生之前将视图模板和conf/routes文件转换为Scala代码。
tl;dr更改sources in (Compile, doc)以排除*.scala文件，以便scaladoc不会启动
您可以在下面看到sources in (Compile, doc)保存所有源代码，包括项目中管理的和未管理的:
> inspect compile:doc::sources
[info] Task: scala.collection.Seq[java.io.File]
[info] Description:
[info] All sources, both managed and unmanaged.
有了一些filter，你可以很容易地实现你的目标-使用以下build.sbt:
sources in (Compile, doc) <<= sources in (Compile, doc) map { _.filterNot(_.getName endsWith ".scala") }
一个示例项目的会话(//的注释是我的，以提高阅读能力):
// display current setting's value
> show compile:doc::sources
[info] ArrayBuffer(/Users/jacek/sandbox/sbt-learning-space/src/main/scala/x.scala, /Users/jacek/sandbox/sbt-learning-space/src/main/java/Hello.java)
[success] Total time: 0 s, completed Aug 24, 2014 9:31:34 PM
// generate docs - scaladoc kicks in since there are scala files
> doc
[info] Updating {file:/Users/jacek/sandbox/sbt-learning-space/}sbt-learning-space...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Main Scala API documentation to /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api...
model contains 3 documentable templates
[info] Main Scala API documentation successful.
Hello
[success] Total time: 1 s, completed Aug 24, 2014 9:32:15 PM
// change the value of sources in the current session only - use session save to retain it
> set sources in (Compile, doc) <<= sources in (Compile, doc) map { _.filterNot(_.getName endsWith ".scala") }
[info] Defining compile:doc::sources
[info] The new value will be used by compile:doc
[info] Reapplying settings...
[info] Set current project to hello (in build file:/Users/jacek/sandbox/sbt-learning-space/)
// display current setting's value - it only holds the single java file
> show compile:doc::sources
[info] ArrayBuffer(/Users/jacek/sandbox/sbt-learning-space/src/main/java/Hello.java)
[success] Total time: 0 s, completed Aug 24, 2014 9:33:23 PM
// generate docs - javadoc is properly generated
> doc
[info] Main Java API documentation to /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api...
[info] Loading source file /Users/jacek/sandbox/sbt-learning-space/src/main/java/Hello.java...
[info] Constructing Javadoc information...
[info] Standard Doclet version 1.7.0_65
[info] Building tree for all the packages and classes...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/Hello.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/package-frame.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/package-summary.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/package-tree.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/constant-values.html...
[info] Building index for all the packages and classes...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/overview-tree.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/index-all.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/deprecated-list.html...
[info] Building index for all classes...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/allclasses-frame.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/allclasses-noframe.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/index.html...
[info] Generating /Users/jacek/sandbox/sbt-learning-space/target/scala-2.10/api/help-doc.html...
[info] Main Java API documentation successful.
Hello
[success] Total time: 1 s, completed Aug 24, 2014 9:34:01 PM
您可以尝试将 genjavadoc 集成到sbt中，以便生成javadoc。
ScalaDoc仍然可以使用正常的
doc任务生成，
而JavaDoc可以使用genjavadoc:doc生成。
scala 2.12.0-RC1(2016年9月)和SI 4826允许的另一种方法是让scaladoc运行!它将处理javadoc注释!
Scaladoc已经处理Java源代码并为它们生成Scaladoc。
由于各种原因，我们的许多Scala代码库中至少有一些Java。
它只是忽略文档注释。
如果Scaladoc可以为这些混合的代码库生成完整的文档，包括所有的文档注释，那就太好了。