I see these options for this purpose:
- Generate the java source code and compile it with the external javac or the internal compiler tools (can't remember the name). And as you are responsible for the naming, just include a version count in the class name to avoid class loading anomalies.
- Use the built in JavaScript engine support
- Some scenarios can be solved using java Proxys
Edit: I once created a Java 1.4 program which took business rules from an existing legacy database, generated java files (basically implementations of a Predicate interface) with a bunch of println() from them and used the command line javac to compile them.
