How to add a github java dependency in sbt config? - scala

Question

I've added this code to my Build.scala.
lazy val root = Project("root", file(".")) dependsOn(jbcrypt)
lazy val jbcrypt = RootProject(uri("https://github.com/jeremyh/jBCrypt.git"))
But sbt fails with the error:
[error] (root/*:update) sbt.ResolveException: unresolved dependency: default#jbcrypt_2.11;0.1-SNAPSHOT: not found
How to tell sbt that it is Java not Scala?
How to reference to a specific branch or tag?
Thank you.

Answer 1

Building a project from source is only possible if the referenced project is a sbt project. sbt doesn't know of all the different build systems out there, so how is it supposed to know how to build a non sbt project?
It is possible to add support for other build systems through a sbt plugin but this may be a lot of work.
Your referenced project is a simple Maven project, which means that you can easily create a sbt project from it. Just fork the repo and create a build.sbt with the following content:
scalaVersion := "2.11.5"
projectDependencies += "junit" % "junit" % "3.8.1" % "test"
publishTo := {
val nexus = "https://oss.sonatype.org/"
if (isSnapshot.value) Some("snapshots" at nexus + "content/repositories/snapshots")
else Some("releases" at nexus + "service/local/staging/deploy/maven2")
}
This is the minimal code that was necessary to get it up and running. sbt seems to require that a publish repo is specified, it also seems to require an explicit Scala version. The dependency is already specified by your linked Maven project.
Of course, you know need to change the URI of RootProject to point to the location of your fork.
To your second question: You can reference a commit/tag/branch by appending it to the URI, separated with a # sign:
uri("git://github.com/your/repo#<commit-hash/tag/branch>")