And sometimes I can do fine with no wrapper at all. Not only there's a lot of JVM code available, but interfacing with it is pretty quick, straightforward and smooth compared to wrapping C (or, god forbid, C++) from any Scheme I tried. I found that's very important. You can have lots of code theoretically available for wrapping, but there's more of an impedance mismatch between C and Scheme (think continuations/TCO, garbage collection, type conversion, and the fact that some tools in Racket/Scheme ecosystems will be blind to what happens in C land) so in practice it's a lot more work.
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