assembly-merge-strategy issues using sbt-assembly

Question

I am trying to convert a scala project into a deployable fat jar using sbt-assembly. When I run my assembly task in sbt I am getting the following error:

Mer         


        

Answer 1

As for the current version 0.11.2 (2014-03-25), the way to define the merge strategy is different.

This is documented here, the relevant part is:

NOTE: mergeStrategy in assembly expects a function, you can't do

mergeStrategy in assembly := MergeStrategy.first

The new way is (copied from the same source):

mergeStrategy in assembly <<= (mergeStrategy in assembly) { (old) =>
  {
    case PathList("javax", "servlet", xs @ _*)         => MergeStrategy.first
    case PathList(ps @ _*) if ps.last endsWith ".html" => MergeStrategy.first
    case "application.conf" => MergeStrategy.concat
    case "unwanted.txt"     => MergeStrategy.discard
    case x => old(x)
  }
}

This is possibly applicable to earlier versions as well, I don't know exactly when it has changed.