Problem: When including several projects that include log4j2
plugins,
sbt-assembly
will encounter multiple versions of the Log4j2Plugins.dat
cache file that it won't be able to reconcile.
Solution: Log4j2 provides a PluginCache
class that creates consistent,
serialisable cache from multiple different ones.
This plugin provides a simple function to merge those files in a safe way.
For sbt 1.x add sbt-assembly-log4j2
as a dependency in
project/assembly.sbt
alongside sbt-assembly
:
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "<version>")
addSbtPlugin("com.github.nomadblacky" % "sbt-assembly-log4j2" % "0.1.1")
In your merge strategy, add the following case:
import sbtassembly.Log4j2MergeStrategy
assemblyMergeStrategy in assembly := {
//...
case PathList(ps @ _*) if ps.last == "Log4j2Plugins.dat" => Log4j2MergeStrategy.plugincache
//...
}