即使使用简单的Hello程序,如果我将play-json作为库依赖关系添加到build.sbt文件中,当我在sbt(sbt-assembly插件)中执行“ assembly”命令时,总是会出现合并错误。 。
[error] stack trace is suppressed; run last assembly for the full output
[error] (assembly) deduplicate: different file contents found in the following:
[error] /home/heitor/.cache/coursier/v1/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-annotations/2.10.1/jackson-annotations-2.10.1.jar:module-info.class
[error] /home/heitor/.cache/coursier/v1/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-core/2.10.1/jackson-core-2.10.1.jar:module-info.class
[error] /home/heitor/.cache/coursier/v1/https/repo1.maven.org/maven2/com/fasterxml/jackson/core/jackson-databind/2.10.1/jackson-databind-2.10.1.jar:module-info.class
[error] /home/heitor/.cache/coursier/v1/https/repo1.maven.org/maven2/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.10.1/jackson-datatype-jdk8-2.10.1.jar:module-info.class
[error] /home/heitor/.cache/coursier/v1/https/repo1.maven.org/maven2/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.10.1/jackson-datatype-jsr310-2.10.1.jar:module-info.class
MergeApp.scala
object MergeApp extends App {
println("Hello")
}
build.sbt
name := "MergeBug"
version := "0.1"
scalaVersion := "2.13.1"
val playJsonVersion = "2.8.1"
libraryDependencies ++= Seq("com.typesafe.play" %% "play-json" % playJsonVersion)
project / build.properties
sbt.version = 1.3.8
project / plugins.sbt
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.10")
您需要定义自定义合并策略。参见https://github.com/sbt/sbt-assembly#merge-strategy
由于module-info.class
文件仅对Java 9+模块有用,因此您可以放心地丢弃它们:
assemblyMergeStrategy in assembly := {
case "module-info.class" => MergeStrategy.discard
case x =>
val oldStrategy = (assemblyMergeStrategy in assembly).value
oldStrategy(x)
}