hip chat build message have invalid url

[j-a-young]

On the Manage Jenkins page, under "Global HipChat Notifier Settings" I set the "Jenkins URL" to our jenkins sever (eg, http://foo.bar.com/) but when jenkins sends a message to our HipChat channel, the urls to the build are of the form "/job/project-name/buildNumber/"

I've also set the "Jenkins URL" property under the "Jenkins Location" on the Manage Jenkins page, and it's set to the same value.

[j-a-young]

I also see this in the log file:

INFO: Posting: Jenkins to $roomId: $projectName - #93 Started by user $me (<a href='nulljob/<project name>/93/'>Open</a>) green