It is much more likely someone over there will now.
Thomas
PL/Java should work with PostgreSQL 8.4, see the mailing list archives:
http://lists.pgfoundry.org/pipermail/pljava-commits/2009-August/000056.html
I pulled the source from CVS and it compiled fine (on my 32-bit
RedHat Linux system).
I didn't install and test it - I'll leave that to you.
Yours,
Laurenz Albe