[英]scala.MatchError when creating fat jar using sbt assembly
我正在尝试为我的项目创建一个jar文件。 我正在使用sbt assembly命令生成一个。
但是开始合并文件时出现错误:
scala.MatchError:spray \\ http \\ parser \\ ProtocolParameterRules $$ anonfun $ DeltaSeconds $ 1.class(java.lang.String类的)
我的build.sbt看起来像这样:
lazy val commonSettings = Seq(
name := "SampleSpray",
version := "1.0",
scalaVersion := "2.11.7",
organization := "com.test"
)
mainClass in assembly := Some("com.example.Boot")
lazy val root = (project in file(".")).
settings(commonSettings: _*).
settings(
name := "test",
resolvers += "spray repo" at "http://repo.spray.io",
libraryDependencies ++= {
val akkaV = "2.3.9"
val sprayV = "1.3.3"
Seq(
"io.spray" %% "spray-can" % sprayV,
"io.spray" %% "spray-routing" % sprayV,
"io.spray" %% "spray-json" % "1.3.2",
"io.spray" %% "spray-testkit" % sprayV % "test",
"com.typesafe.akka" %% "akka-actor" % akkaV,
"com.typesafe.akka" %% "akka-testkit" % akkaV % "test",
"org.specs2" %% "specs2-core" % "2.3.11" % "test",
"com.sksamuel.elastic4s" %% "elastic4s-core" % "2.1.0",
"com.sksamuel.elastic4s" %% "elastic4s-jackson" % "2.1.0",
"net.liftweb" %% "lift-json" % "2.6+"
)
}
)
assemblyOption in assembly := (assemblyOption in assembly).value.copy(cacheUnzip = false)
assemblyMergeStrategy in assembly := {
case "BaseDateTime.class" => MergeStrategy.first
}
不知道为什么会出现错误。
assemblyMergeStrategy in assembly
的设置assemblyMergeStrategy in assembly
的类型为String => MergeStrategy
。
在您的sbt文件中,您正在使用局部函数
{
case "BaseDateTime.class" => MergeStrategy.first
}
这是语法糖
(s:String) => {
s match {
case "BaseDateTime.class" => MergeStrategy.first
}
}
此表示表明,给定的函数不会穷举匹配所有传递的字符串。 在您的情况下,sbt-assembly尝试将名为spray\\http\\parser\\ProtocolParameterRules$$anonfun$DeltaSeconds$1.class
的文件合并到胖子jar中,但是找不到任何匹配的合并策略。 您还需要一个“默认”情况:
(s:String) => {
s match {
case "BaseDateTime.class" => MergeStrategy.first
case x =>
val oldStrategy = (assemblyMergeStrategy in assembly).value
oldStrategy(x)
}
}
或写为部分函数:
{
case "BaseDateTime.class" => MergeStrategy.first
case x =>
val oldStrategy = (assemblyMergeStrategy in assembly).value
oldStrategy(x)
}
当sbt-assembly的assembly
任务由于Elasticsearch中的名称冲突及其可传递的joda-time依赖性而无法创建胖jar时,我也遇到了相同的问题。 Elasticsearch重新定义了类org.joda.time.base.BaseDateTime
这是在乔达时库已经实现。 我已按照您的方法使用以下assemblyMergeStrategy
告诉sbt-assembly如何解决此冲突:
assemblyMergeStrategy in assembly := {
case "org/joda/time/base/BaseDateTime.class" => MergeStrategy.first
case x =>
val oldStrategy = (assemblyMergeStrategy in assembly).value
oldStrategy(x)
}
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