我正在尝试为我的项目创建一个jar文件。我正在使用 sbt 程序集命令来生成一个。
但是当它开始合并文件时出现错误:
斯卡拉。匹配错误: spray\http\parser\ProtocolParameterRules$$anonfun$DeltaSeconds$1.class (类 java.lang.String)
我的build.sbt看起来像这样:
lazy val commonSettings = Seq(
name := "SampleSpray",
version := "1.0",
scalaVersion := "2.11.7",
organization := "com.test"
)
mainClass in assembly := Some("com.example.Boot")
lazy val root = (project in file(".")).
settings(commonSettings: _*).
settings(
name := "test",
resolvers += "spray repo" at "http://repo.spray.io",
libraryDependencies ++= {
val akkaV = "2.3.9"
val sprayV = "1.3.3"
Seq(
"io.spray" %% "spray-can" % sprayV,
"io.spray" %% "spray-routing" % sprayV,
"io.spray" %% "spray-json" % "1.3.2",
"io.spray" %% "spray-testkit" % sprayV % "test",
"com.typesafe.akka" %% "akka-actor" % akkaV,
"com.typesafe.akka" %% "akka-testkit" % akkaV % "test",
"org.specs2" %% "specs2-core" % "2.3.11" % "test",
"com.sksamuel.elastic4s" %% "elastic4s-core" % "2.1.0",
"com.sksamuel.elastic4s" %% "elastic4s-jackson" % "2.1.0",
"net.liftweb" %% "lift-json" % "2.6+"
)
}
)
assemblyOption in assembly := (assemblyOption in assembly).value.copy(cacheUnzip = false)
assemblyMergeStrategy in assembly := {
case "BaseDateTime.class" => MergeStrategy.first
}
不知道为什么会出现错误。
设置assemblyMergeStrategy in assembly
的类型为 String => MergeStrategy
。
在您的 sbt 文件中,您正在使用部分函数
{
case "BaseDateTime.class" => MergeStrategy.first
}
这是句法糖
(s:String) => {
s match {
case "BaseDateTime.class" => MergeStrategy.first
}
}
这种表示形式表明给定的函数不会穷举匹配所有传递的字符串。在您的情况下,sbt-assembly 尝试将名为 sprayhttpparserProtocolParameterRules$$anonfun$DeltaSeconds$1.class
的文件合并到 fat jar 中,但找不到任何匹配的合并策略。您还需要一个"默认"案例:
(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 中的名称冲突及其传递的 joda-time 依赖项而无法创建一个胖罐时,我也遇到了同样的问题。Elasticsearch重新定义了已经在joda-time库中实现的类org.joda.time.base.BaseDateTime
。我按照您的方法告诉 sbt-assembly 如何使用以下assemblyMergeStrategy
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)
}