For some reason, that doesn't work for me in the plist; I have to hard code the path. I kept getting <code>Unable to access jarfile $(brew --prefix solr)/libexec/example/start.jar</code>...
Thanks for the tutorial but there is a slight missing bit of content:
And update the core names like follows:
Save the changes using CTRL+X then Y to confirm.
It looks like a missing tag or something! I can see it in the source anyway.