How can I create a jar from some Scala source code?

Question

How can I create a jar from some Scala source code? I want to use some of that code in a Clojure project of mine.

Is there a simpler way than doing batch files as in this SO question?

Thanks, Alex

Answer 1

Scala is in no way special when it comes to what you do with the .class files produced by its compiler. Just use the jar command with the c action flag.

However, you will need to have the scala-library.jar file in the class-path when you run the program that uses the Scala-compiled .class files. And be careful to use the scala-library.jar for / from the same Scala Development Kit that you used to compile the Scala source. As of yet, there isn't inter-version binary compatibility for Scala-generated .class files.

Answer 2

One way in which creating .jar can be "simpler" is to use simple-build-tool, which supports the package* targets and requires rather little time to set up and use.

Answer 3

You could use the maven scala plugin or the buildr tool.

Answer 4

This has actually really helped

If you are using eclipse then just export your project as a jar file

goto file -> Export ->java -> as a jar file

Just bit more explanation:

1. Install the scala eclipse environment from typesafe
2. Once you are done coding, export as a jar (file -> Export ->java -> as a jar file)
3. from a command line you can run java -cp path_to_dependancies:your_newly_generated_jar:. your_main_object_name.

hth.