scala.MatchError: sbt+assembly 中的 org\apache\commons\io\IOCase.class (of class java.lang.String)答案

【问题标题】：scala.MatchError: org\apache\commons\io\IOCase.class (of class java.lang.String) in sbt+assemblyscala.MatchError: sbt+assembly 中的 org\apache\commons\io\IOCase.class (of class java.lang.String)
【发布时间】：2017-07-27 01:25:52
【问题描述】：

当我使用 sbt 程序集时，它会打印如下错误：

[error] (*:assembly) scala.MatchError: org\apache\commons\io\IOCase.class (of class java.lang.String)

这些是我的配置：

1、assembly.sbt：

import AssemblyKeys._
assemblySettings
mergeStrategy in assembly := {
    case PathList("org", "springframework", xs@_*) => MergeStrategy.last
}

2、bulid.sbt

import AssemblyKeys._
lazy val root = (project in file(".")).
  settings(
    name := "DmpRealtimeFlow",
    version := "1.0",
    scalaVersion := "2.11.8",
    libraryDependencies += "com.jd.ads.index" % "ad_index_dmp_common" % "0.0.4-SNAPSHOT",
    libraryDependencies += "org.apache.spark" % "spark-core_2.11" % "2.1.0" % "provided",
    libraryDependencies += "org.apache.spark" % "spark-sql_2.11" % "2.1.0" % "provided",
    libraryDependencies += "org.apache.spark" % "spark-streaming_2.11" % "2.1.0" % "provided",
    libraryDependencies += "mysql" % "mysql-connector-java" % "5.1.8",
    libraryDependencies += "org.springframework" % "spring-beans" % "3.1.0.RELEASE",
    libraryDependencies += "org.springframework" % "spring-context" % "3.1.0.RELEASE",
    libraryDependencies += "org.springframework" % "spring-core" % "3.1.0.RELEASE",
    libraryDependencies += "org.springframework" % "spring-orm" % "3.1.0.RELEASE",
    libraryDependencies += "org.mybatis" % "mybatis" % "3.2.1" % "compile",
    libraryDependencies += "org.mybatis" % "mybatis-spring" % "1.2.2",
    libraryDependencies += "c3p0" % "c3p0" % "0.9.1.2"
  )

3、项目工具：

sbt:0.13.5
assembly:0.11.2
java:1.7
scala:2.11.8

有什么帮助吗？

【问题讨论】：

标签： scala sbt sbt-assembly

【解决方案1】：

问题可能在于组装块中mergeStrategy中缺少默认情况：

    case x =>
      val oldStrategy = (assemblyMergeStrategy in assembly).value
      oldStrategy(x)

此外，mergeStrategy 已被弃用，而应使用 assemblyMergeStrategy。

基本上是

{
    case PathList("org", "springframework", xs@_*) => MergeStrategy.last
}

是一个偏函数 String => MergeStrategy 只为一种类型的输入定义，即为带有包前缀“org\springframework”的类。但是，它适用于项目中的所有类文件，并且第一个与上述前缀不匹配的类文件（org\apache\commons\io\IOCase.class）会导致MatchError。

【讨论】：