Question

我正在尝试使用sbt-assembly将scala项目转换为可部署的胖jar。当我在sbt中运行我的程序集任务时，我收到以下错误：

Merging 'org/apache/commons/logging/impl/SimpleLog.class' with strategy 'deduplicate'
    :assembly: deduplicate: different file contents found in the following:
    [error] /Users/home/.ivy2/cache/commons-logging/commons-logging/jars/commons-logging-1.1.1.jar:org/apache/commons/logging/impl/SimpleLog.class
    [error] /Users/home/.ivy2/cache/org.slf4j/jcl-over-slf4j/jars/jcl-over-slf4j-1.6.4.jar:org/apache/commons/logging/impl/SimpleLog.class

现在来自sbt-assembly文档：

如果多个文件共享相同的相对路径（例如，名为的资源）       application.conf在多个依赖JAR中），默认策略是       验证所有候选人是否具有相同的内容和错误       除此以外。可以使用每个路径配置此行为       以下内置策略之一或编写自定义策略：


MergeStrategy.deduplicate是上述默认值

MergeStrategy.first选择类路径顺序中的第一个匹配文件

MergeStrategy.last选择最后一个

MergeStrategy.singleOrError发出冲突错误消息

MergeStrategy.concat简单地连接所有匹配的文件并包含结果

MergeStrategy.filterDistinctLines也会连接，但在此过程中会留下重复的内容

MergeStrategy.rename重命名源自jar文件的文件

MergeStrategy.discard只会丢弃匹配的文件

通过这种方式，我按照以下方式设置build.sbt：

import sbt._
import Keys._
import sbtassembly.Plugin._
import AssemblyKeys._
name := "my-project"
version := "0.1"
scalaVersion := "2.9.2"
crossScalaVersions := Seq("2.9.1","2.9.2")

//assemblySettings
seq(assemblySettings: _*)

resolvers ++= Seq(
    "Typesafe Releases Repository" at "http://repo.typesafe.com/typesafe/releases/",
    "Typesafe Snapshots Repository" at "http://repo.typesafe.com/typesafe/snapshots/",
    "Sonatype Repository" at "http://oss.sonatype.org/content/repositories/releases/"
)

libraryDependencies ++= Seq(
    "org.scalatest" %% "scalatest" % "1.6.1" % "test",
    "org.clapper" %% "grizzled-slf4j" % "0.6.10",
    "org.scalaz" % "scalaz-core_2.9.2" % "7.0.0-M7",
    "net.databinder.dispatch" %% "dispatch-core" % "0.9.5"
)

scalacOptions += "-deprecation"
mainClass in assembly := Some("com.my.main.class")
test in assembly := {}
mergeStrategy in assembly := mergeStrategy.first

在build.sbt的最后一行，我有：

mergeStrategy in assembly := mergeStrategy.first

现在，当我运行SBT时，我收到以下错误：

error: value first is not a member of sbt.SettingKey[String => sbtassembly.Plugin.MergeStrategy]
    mergeStrategy in assembly := mergeStrategy.first

有人可以指出我在这里做错了吗？

由于

Answer 1

对于当前版本0.11.2（2014-03-25），定义合并策略的方式不同。

记录在案here，相关部分是：

注意：程序集中的mergeStrategy需要一个函数，你不能
mergeStrategy in assembly := MergeStrategy.first

新方法是（从同一来源复制）：

mergeStrategy in assembly <<= (mergeStrategy in assembly) { (old) =>
  {
    case PathList("javax", "servlet", xs @ _*)         => MergeStrategy.first
    case PathList(ps @ _*) if ps.last endsWith ".html" => MergeStrategy.first
    case "application.conf" => MergeStrategy.concat
    case "unwanted.txt"     => MergeStrategy.discard
    case x => old(x)
  }
}

这也可能适用于早期版本，我不确切知道它何时发生变化。

Answer 2

我刚刚设置了一个需要重新连接一些mergeStrategies的sbt项目，并且发现答案有点过时，让我添加我的工作代码版本（截至4-7-2015）

sbt 0.13.8
scala 2.11.6

装配0.13.0

mergeStrategy in assembly := {
  case x if x.startsWith("META-INF") => MergeStrategy.discard // Bumf
  case x if x.endsWith(".html") => MergeStrategy.discard // More bumf
  case x if x.contains("slf4j-api") => MergeStrategy.last
  case x if x.contains("org/cyberneko/html") => MergeStrategy.first
  case PathList("com", "esotericsoftware", xs@_ *) => MergeStrategy.last // For Log$Logger.class
  case x =>
     val oldStrategy = (mergeStrategy in assembly).value
     oldStrategy(x)
}

Answer 3

我认为MergeStrategy.first应该是M，mergeStrategy in assembly := MergeStrategy.first。

Answer 4

对于新的sbt版本（sbt-version：0.13.11），我收到了slf4j的错误;暂时采取了简单的方法：请在这里查看答案Scala SBT Assembly cannot merge due to de-duplication error in StaticLoggerBinder.class，其中提到了sbt-dependency-graph工具，手动执行此操作非常酷

assemblyMergeStrategy in assembly <<= (assemblyMergeStrategy in assembly) {
  (old) => {
    case PathList("META-INF", xs @ _*) => MergeStrategy.discard
    case x => MergeStrategy.first
  }
}

Answer 5

这是合并大多数常见java / scala项目的正确方法。它负责META-INF和课程。

还负责META-INF中的服务注册。

assemblyMergeStrategy in assembly := {
case x if Assembly.isConfigFile(x) =>
  MergeStrategy.concat
case PathList(ps @ _*) if Assembly.isReadme(ps.last) || Assembly.isLicenseFile(ps.last) =>
  MergeStrategy.rename
case PathList("META-INF", xs @ _*) =>
  (xs map {_.toLowerCase}) match {
    case ("manifest.mf" :: Nil) | ("index.list" :: Nil) | ("dependencies" :: Nil) =>
      MergeStrategy.discard
    case ps @ (x :: xs) if ps.last.endsWith(".sf") || ps.last.endsWith(".dsa") =>
      MergeStrategy.discard
    case "plexus" :: xs =>
      MergeStrategy.discard
    case "services" :: xs =>
      MergeStrategy.filterDistinctLines
    case ("spring.schemas" :: Nil) | ("spring.handlers" :: Nil) =>
      MergeStrategy.filterDistinctLines
    case _ => MergeStrategy.first
  }
case _ => MergeStrategy.first}

Answer 6

快速更新：不建议使用mergeStrategy。使用assemblyMergeStrategy。除此之外，早期的反应仍然很可靠

Answer 7

在build.sbt中添加以下内容以将kafka添加为源或目标

 assemblyMergeStrategy in assembly := {
 case PathList("META-INF", xs @ _*) => MergeStrategy.discard
 //To add Kafka as source
 case "META-INF/services/org.apache.spark.sql.sources.DataSourceRegister" => 
 MergeStrategy.concat
 case x => MergeStrategy.first
 }

使用sbt-assembly进行汇编合并策略问题

7 个答案: