This gives sample Scala code for the fourth article in my JVM Concurrency series on IBM developerWorks. The project uses a Maven build, so just do the usual mvn clean install to get everything to a working state. The code is all in the com.sosnoski.concur.article4 package, within the main/scala tree.

To run the demonstration code from the command line use mvn scala:run -Dlauncher={name}, where {name} selects the test code:

1. happypath - Demonstrate code with only successful completions
2. unhappypath - Demonstrate code with exceptions thrown

You can import the project into ScalaIDE with the standard Maven project import handling.