An implementation of Scheme for the Java platform
http://www.gnu.org/software/kawa

Kawa is a programming language for the Java platform. It is an implementation of Scheme, which, is in the Lisp family of programming languages. Kawa has many useful features, including convenient integration with Java. It can be used as a “scripting language”, but includes a compiler and all the benefits of a “real” programming language, including optional static typing, so Kawa programs can be as efficient as Java.