sbt-assembly is not including scala libraries

Question

The code I'm writing will be run in AWS Lambda which only has the Java 8 runtime installed so I need the scala libraries to be included in my jar. When I give it the jar I built with sbt-assembly I'm getting java.lang.NoClassDefFoundError: scala/Function3 .

This is all I have in build.sbt for the assembly plugin:

assemblyOption in assembly := (assemblyOption in assembly).value.copy(includeScala = true)

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

This still happens whether or not I have the line that discards the META-INF files.

I used brew to install scala and I have tried setting my $SCALA_HOME to /usr/local/opt/scala/idea (caveats section of brew info scala ) and /usr/local/bin/scala (output of which scala )

:: EDIT ::

I unpacked the jar and found that the class in question was actually included in the jar here: scala/Function3_scala-library-2.12.7_scala-library-2.12.7_scala-library-2.12.7.class

Answer 1

我在我的Intellij的类路径中添加了scala-library.jar ，删除了目标文件夹并运行了sbt assembly并且可以正常工作。