currently there is no feature that allows other jobs to be run prior to running
a configured job (unless using shell with wget)

e.g. JobA and JobB. Every time JobB is run, JobA needs to be run first. There is
no option in JobB that allows this to be set.

The 2 ways to get this to work, is to configure JobA to run JobB afterwards and
then always only run JobA, or to use wget -o /dev/null
http://hudsonserver/hudson/job/JobA/build?token=abc as the first step in JobB.