Sometimes qstat won't list jobs that I had started some time ago and that I know are running (I know because they write stuff to the database which I can see in the webapp). Here's how I started the job (simplified a bit):
jstart -N ca-feedcheck -mem 1800m java -Xmx100M -cp languagetool-wikipedia.jar org.languagetool.dev.wikipedia.atom.AtomFeedCheckerCmd
I don't know how to systematically reproduce this, but it has happened several times already. Other jobs are listed by qstat.