Making stand-alone jar with Simple Build Tool.

Question

Is there a way to tell sbt to package all needed libraries (scala-library.jar) into the main package, so it is stand-alone? (static?)

Answer 1

Directly, this is not possible without extending sbt (a custom action after the model of the "package" sbt action).

GitHub mentions an assembly task, custom made for jetty deployment. You could adapt it for your need though.

The code is pretty generic (from this post, and user Rio):

 project / build / AssemblyProject.scala

 import sbt._

 trait AssemblyProject extends BasicScalaProject
 {
         def assemblyExclude(base: PathFinder) = base / "META-INF" ** "*"
         def assemblyOutputPath = outputPath / assemblyJarName
         def assemblyJarName = artifactID + "-assembly-" + version + ".jar"
         def assemblyTemporaryPath = outputPath / "assembly-libs"
         def assemblyClasspath = runClasspath
         def assemblyExtraJars = mainDependencies.scalaJars

         def assemblyPaths(tempDir: Path, classpath: PathFinder, extraJars: PathFinder, exclude: PathFinder => PathFinder) =
         {
                 val (libs, directories) = classpath.get.toList.partition(ClasspathUtilities.isArchive)
                 for(jar <- extraJars.get ++ libs) FileUtilities.unzip(jar, tempDir, log).left.foreach(error)
                 val base = (Path.lazyPathFinder(tempDir :: directories) ##)
                 (descendents(base, "*") --- exclude(base)).get
         }

         lazy val assembly = assemblyTask(assemblyTemporaryPath, assemblyClasspath, assemblyExtraJars, assemblyExclude) dependsOn(compile)
         def assemblyTask(tempDir: Path, classpath: PathFinder, extraJars: PathFinder, exclude: PathFinder => PathFinder) =
                 packageTask(Path.lazyPathFinder(assemblyPaths(tempDir, classpath, extraJars, exclude)), assemblyOutputPath, packageOptions)
 }

Answer 2

It takes a bit of work, but you can also use Proguard from within SBT to create a standalone JAR.

I did this recently in the SBT build for Scalala.