The fonts which the default font.properties uses come with the JDK code.
See share/lib/fonts/. These are TrueType fonts though. Robert suggests
you may need a TrueType font server (e.g. xfsft) for them to be useful,
but I'm pretty sure I'm not running a TrueType font server and they appear
to just work for me.
I was under the impression that you needed support in the X server as
well. Could you run xdpyinfo on your system and look at what extensions
I'm still going to install the URW fonts and give them a go though :).