ADT hangs when building headless - any workaround?

I'm setting up build processes to automate building of a desktop app for both Windows and Mac OS X. I've run into a problem with ADT on the Mac to package the app: when I run it via SSH, the process just hangs forever unless the build user is logged in on the Mac's console.

I've already tried passing -Djava.awt.headless=true to adt.jar, but that doesn't seem to help.

Anybody have a solution for this, short of "always leave the build user logged in on the console"?