META-INF/javax.annotation.processing.Processor is included empty when shading is enabled - log4j

Hello,

to reproduce I create a simple sbt project with.

sbt new scala/hello-world.g8

Any sbt-assembly version >= 1.0.0 has the issue.

In the build.sbt:

scalaVersion := "2.12.12"

name := "hello-world"
version := "1.0"

libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.1.1"
libraryDependencies += "org.apache.logging.log4j" % "log4j-core" % "2.17.1"

assembly / assemblyMergeStrategy := {
  // As an example, keep services but discard all the rest
  case PathList("META-INF", "services", xs @ _*) => MergeStrategy.first
  case PathList("META-INF", xs @ _*)             => MergeStrategy.discard
  case x                                         => MergeStrategy.first
}
// Randomly shade something - if your remove this, the issue is not re-produced
assembly / assemblyShadeRules := Seq(
  ShadeRule.rename("scala.collection.compat.**" -> "shadecompat.@1").inAll
)

In the produced hello-world-assembly-1.0.jar file \META-INF\services\javax.annotation.processing.Processor is empty.

To my point of view this is bug, because that file is not empty in the originating log4j-core-2.17.1.jar.

To "fix" this issue, I can either change the plugin version to an older one, like 0.14.10, or remove the shading rules.

Additonal files: In my project that produces an 160MB .jar file, I have the same issue with META-INF\org.apache.logging.log4j.util.PropertySource. Interestingly, other javax.* or org.apache.logging.log4j.* files are correctly included.

sbt / sbt-assembly

META-INF/javax.annotation.processing.Processor is included empty when shading is enabled - log4j #490