在构建根项目的胖 JAR 时忽略子项目

Question

我有一个根项目，我想用 sbt-assembly 构建一个胖 JAR。它确实有一个子项目，它取决于我想要忽略胖 JAR 的根（好像它不存在一样）。我该怎么做？

基本上我想要根项目包，就好像 Try 1 中的 build.sbt 没有 localMode 子项目一样。

试试 1

我的build.sbt 是

import sbt.Keys._

name := "myprojectname"
version := "0.0.1-SNAPSHOT"
scalaVersion in ThisBuild := "2.11.8"

mainClass in(Compile, run) := Some("com.mywebsite.MyExample")
mainClass in(Compile, packageBin) := Some("com.mywebsite.MyExample")
mainClass in assembly := Some("com.mywebsite.MyExample")

libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Provided
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % Test

lazy val localMode = project.
  in(file("localMode")).
  dependsOn(RootProject(file("."))).
  settings(
    name := "myprojectname_local",
    libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Compile,
    mainClass in(Compile, run) := Some("com.mywebsite.MyExample"),
    mainClass in(Compile, packageBin) := Some("com.mywebsite.MyExample")
  )

fullClasspath in assembly := { 
  (fullClasspath in assembly).value diff 
  (fullClasspath in assembly in localMode).value 
}

目前我收到错误消息：

[error] (localMode/*:assembly) deduplicate: different file contents found in the following:
[error] ~/.ivy2/cache/org.sonatype.sisu/sisu-guice/jars/sisu-guice-2.1.7-noaop.jar:com/google/inject/AbstractModule.class
[error] ~/.ivy2/cache/com.google.inject/guice/jars/guice-3.0.jar:com/google/inject/AbstractModule.class
[error] deduplicate: different file contents found in the following:
[error] ~/.ivy2/cache/org.sonatype.sisu/sisu-guice/jars/sisu-guice-2.1.7-noaop.jar:com/google/inject/Binder.class
[error] ~/.ivy2/cache/com.google.inject/guice/jars/guice-3.0.jar:com/google/inject/Binder.class
[error] deduplicate: different file contents found in the following:
[error] ~/.ivy2/cache/org.sonatype.sisu/sisu-guice/jars/sisu-guice-2.1.7-noaop.jar:com/google/inject/ConfigurationException.class
[error] ~/.ivy2/cache/com.google.inject/guice/jars/guice-3.0.jar:com/google/inject/ConfigurationException.class

and so on...

如果我命令sbt root/assembly 我得到

[error] Expected ID character
[error] Not a valid command: root (similar: reboot, boot, project)
[error] Expected project ID
[error] Expected configuration
[error] Expected ':' (if selecting a configuration)
[error] Expected key
[error] Not a valid key: root (similar: products)
[error] root/assembly
[error]     ^

试试 2

我的第二个build.sbt 无法构建：

import sbt.Keys._

lazy val commonSettings = Seq(
  version := "0.0.1-SNAPSHOT",
  scalaVersion in ThisBuild := "2.11.8",
  mainClass in(Compile, run) := Some("com.mywebsite.MyExample"),
  mainClass in(Compile, packageBin) := Some("com.mywebsite.MyExample"),
  libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % Test
)

lazy val root = project.
  in(file("root")).
  dependsOn(RootProject(file("."))).
  settings(
    name := "myprojectname",
    libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Provided,
    mainClass in assembly := Some("com.mywebsite.MyExample")
  )

lazy val localMode = project.
  in(file("localMode")).
  dependsOn(RootProject(file("."))).
  settings(
    name := "myprojectname_local",
    libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Compile
  )

Answer 1

我认为您可以使用 assembly::fullClasspath 设置来实现。 default 设置为 fullClasspath or (fullClasspath in Runtime)。所以也许你可以这样做：

fullClasspath in assembly := { 
  (fullClasspath in assembly).value diff 
  (fullClasspath in assembly in localMode).value 
}

在没有关于您特定项目配置的详细信息的情况下，我猜localMode 是您要排除的子项目的名称。

更新

Try 2 中的 build.sbt 存在一些问题： - 您不会在项目中添加常用设置 - “root”是项目目录的根目录（即in file(".")） - 如果你显式定义root项目，另一个应该依赖它，而不是RootProject，这只是一种引用“隐式”定义的根项目的方式

import sbt.Keys._

lazy val commonSettings = Seq(
  version := "0.0.1-SNAPSHOT",
  scalaVersion in ThisBuild := "2.11.8",
  mainClass in(Compile, run) := Some("com.mywebsite.MyExample"),
  mainClass in(Compile, packageBin) := Some("com.mywebsite.MyExample"),
  libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % Test
)

lazy val root = project.in(file(".")).
  settings(commonSettings: _*).
  settings(
    name := "myprojectname",
    libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Provided,
    mainClass in assembly := Some("com.mywebsite.MyExample")
  )

lazy val localMode = project. // by default the name of the project val is the name of its base directory
  dependsOn(root).
  settings(commonSettings: _*).
  settings(
    name := "myprojectname_local",
    libraryDependencies += "org.apache.spark" %% "spark-core" % "2.0.0" % Compile
  )

在Multi-project builds 上查看 sbt 文档。关于root 项目的问题，有一章叫做Default root project。现在有了这些修复，root/assembly 是否按预期工作？

Answer 2

试试看

aggregate in (Compile, assembly) := false