sbt 程序集 akka-stream_2.12:2.4.19 和 akka-actor_2.12:2.4.19 被逐出

Question

我想用 sbt 程序集制作我的项目的 fat jar。这是我的 build.sbt：

name := "projName"

version := "1.0"

scalaVersion := "2.12.1"


libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-stream" % "2.5.3",
  "com.typesafe.akka" %% "akka-actor" % "2.5.3",
  "com.typesafe.akka" %% "akka-http" % "10.0.8",
  "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.8.6",
  "com.typesafe" % "config" % "1.3.1",
  "org.apache.kafka" % "kafka-clients" % "0.10.2.1",
  "org.knowm.xchange" % "xchange-core" % "4.2.0",
  "org.knowm.xchange" % "xchange-btce" % "4.2.0"
)

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

宁运行后

sbt assembly

我收到这样的警告：

[warn] There may be incompatibilities among your library dependencies.
[warn] Here are some of the libraries that were evicted:
[warn]  * com.typesafe.akka:akka-stream_2.12:2.4.19 -> 2.5.3
[warn]  * com.typesafe.akka:akka-actor_2.12:2.4.19 -> 2.5.3
[warn] Run 'evicted' to see detailed eviction warnings

然后我运行 sbt evicted 了解更多细节，这里是我得到的：

[warn] There may be incompatibilities among your library dependencies.
[warn] Here are some of the libraries that were evicted:
[warn]  * com.typesafe.akka:akka-stream_2.12:2.4.19 -> 2.5.3 (caller: com.typesafe.akka:akka-http-core_2.12:10.0.8, default:btceclient_2.12:1.0)
[warn]  * com.typesafe.akka:akka-actor_2.12:2.4.19 -> 2.5.3 (caller: com.typesafe.akka:akka-stream_2.12:2.5.3, com.typesafe.akka:akka-parsing_2.12:10.0.8, default:btceclient_2.12:1.0)
[info] Here are other libraries that were evicted:
[info]  * com.fasterxml.jackson.core:jackson-databind:2.8.2 -> 2.8.6 (caller: com.fasterxml.jackson.module:jackson-module-paranamer:2.8.6, com.github.mmazi:rescu:1.9.0, com.fasterxml.jackson.module:jackson-module-scala_2.12:2.8.6)
[info]  * com.fasterxml.jackson.core:jackson-annotations:2.8.0 -> 2.8.6 (caller: com.fasterxml.jackson.core:jackson-databind:2.8.6, com.fasterxml.jackson.module:jackson-module-scala_2.12:2.8.6)
[info]  * com.typesafe:config:1.2.0 -> 1.3.1 (caller: com.typesafe:ssl-config-core_2.12:0.2.1, default:btceclient_2.12:1.0, com.typesafe.akka:akka-actor_2.12:2.5.3)

我知道什么是驱逐警告，但我不知道在当前情况下如何解决。有什么想法吗？

Answer 1

驱逐信息很明确。 akka-http_2.12 : 10.0.8 的 maven 中的快速 search 将告诉您这个工件依赖于 akka-stream_2.12:2.4.19。一种解决方案，您可以在依赖项设置中将 akka-actor 和 akka-stream 降级到 2.4.19。

Answer 2

您可以放心地忽略此消息，因为 2.4 和 2.5 版本 are binary compatible，因此可以从 2.4 升级到 2.5。

Answer 3

修改合并策略：

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

在这里你可以看到新行：case PathList("reference.conf") => MergeStrategy.concat .
这里发生的事情我想不用解释了吧

sbt 程序集 akka-stream_2.12:2.4.19 和 akka-actor_2.12:2.4.19 被逐出

sbt assembly akka-stream_2.12:2.4.19 and akka-actor_2.12:2.4.19 are evicted

jar

sbt

akka

akka-stream

sbt-assembly