How to package jar to a given directory in sbt?

Question

In sbt, if we execute package, a jar file will generated at target/scala-2.12/XXX.jar. But I want to put the jar file at myDirectory/XXX.jar. How can I make this?

Answer 1

The target/ part of the default path is defined by the target setting key and the scala-2.12/ part is defined by the crossTarget setting (because you may cross-compile for different version of Scala). So a simple solution is to add this to your build.sbt:

crossTarget := baseDirectory.value / "myDirectory"

Now if you call package task from sbt, you will get all files the myDirectory/ directory including the jar, classes and other stuff that normally goes to target/scala-2.12/.

If you want to change only the jar's location, you can change the artifactPath setting. But you should set it in the right scope and with the jar filename:

artifactPath in packageBin in Compile := baseDirectory.value / "myDirectory" / "XXX.jar"

// if you're using sbt 1.1+, you can also write like this:
Compile/packageBin/artifactPath := ...

This can easily get more complicated and messy if you have a non-trivial setup. So check the sbt sources to learn how artifactPath setting is actually defined and read about artifacts in the sbt documentation.