"Compiler #2" as it has been affectionately called is a compiler to turn normal Ruby classes into Java classes, so they can be constructed and called by normal Java code. When I asked for 1.3 ...

News JJEdit simplifies compiling, running Java on OS X By Dennis Sellers APR 11, 2002 5:00 pm PDT ...

If I compile them together, I get two class files, and it appears to work. However, once run, "Exception in thread "main" java.lang.NoClassDefFoundError: \Change/class" comes up.

In the decade following the introduction of the Java chip, pre-compiling Java source code for a particular platform, the use of just-in-time compiling and the ongoing speed improvements in general ...

Even better, the above methods are doing the same type coercion on the way in and out that we do for any other Java-based method calling. So your integral numerics are presented to Ruby as Fixnums ...