Installing Java on LINUX iPAQ
JRE 1.3.1 RC1 is available from Blackdown you'll need the tarball:
j2re-1.3.1-RC1-linux-arm.tar.bz2 (md5sum)
and some additional stuff that has to be installed in /
additional-ipaq-stuff.tar.gz (md5sum)
It's a pretty hefty install (it's nearly 13 megs compressed!) so I'd recommend installing the JRE to a CF card to save the iPAQs main memory. To make sure the path & classpath are set both at the serial terminal and in X use /etc/profile.