memory usage

Jigsaw is using up all the memory on my PC (160MB, 200+ of swap), and this
is probably just my a problem of my own ignorance. I am running jigsaw with
this command line:
    java -Xmx30m org.w3c.jigsaw.Main -root C:\jigsaw\Jigsaw
which I thought might limit it (especially since the default value for -Xmx
is 16MB). The servlet I'm running is complex, but should I be doing
something else to control the RAM usage?

Many thanks!     

Luke Call
EDM Group
Micron Technology, Boise