I have updated the project to support both BeanShell and the Eclipse compiler. In other words, you can now write full Java classes with generics ( - but I have keeped the BeanShell interpreter as well).

Features added:
- Full java support thanks to Eclipse compiler
- Full nimbus (when supported).
- Support for manual compilation
- Currently java compilation doesn't work in the Java Web Start version.

I'll soon write a blog or two about the implementation of this program.

The next logical step for this program would be integrating it into a IDE (such as IntelliJ, Eclipse, Netbeans, etc).

(without Java compilation)
Executable jar file (with Java compilation)
Download source code