Java - How do I start up JBoss using ant?

Thanks kindly for the clarification. So hard to keep track of what
they're calling it these days...

To the OP: With this additional information we can suggest the
following:

NT:
<exec command="cmd.exe run.bat" dir="${jboss.root.dir}\bin\"
spawn="true" />

Win 98/ME:
<exec command="command.com run.bat" dir="${jboss.root.dir}\bin\"
spawn="true" />

Disclaimer: Above information is untested. YMMV.