Ok, I figured it out myself. Several issues on my side: 1) In order to get the upstream trigger set up, the dependent project needs to be run at least once, otherwise Jenkins obviously does not know anything about the trigger in first place. 2) Absolute project references of course need to start with a slash, i.e. /repos/barrepo/master 3) If relative project references are used, you need to remember that - by default - the trigger code resolves these references relative to the _parent_ project of the build. So if you have foorepo/master and barrepo/master, then you need to use "../barrepo/master", and not "../../barrepo/master" or anything alike.
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