Since Java 6 you have a script engine built in JVM. Googling, some months ago I have found an Open Source implementations of such an engine capable to interpret script written with JavaScript syntax. As long as it is approved and sponsored by Sun itself (if I well remember), it SHOULD be well done.
I cannot assure anything about it...I have never had a look at Java 6 up to now nor to this project.
But if you want.. try have a look here:
Project homepage and here:
Sun Article Maybe this could be a nice solution... many people knows javascript, you don't have to re-invent a new language ex-novo, almost no effort in implementing a parsing/executing engine..
Hope it helps,
Francesco.