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Okay, so this was a bit tricky, I was about to give it up, but then after 2 hours of RTFMing I got the solution. ;)
The goal was to emulate jdk1.3 with openjdk.
The first trick is to enable the binfmt_misc handler of qemu, as you'll need jre1.3, and the self-extractor of it is an i386 code. pacman -S qemu, service qemu start should do it.
The rest is just a Makefile, something like this.
It was tricky to figure out the right options for the postprocessor (as I was using an odbms) options as well, but that's not a so interesting problem anyway.