I am using GF 3 with Idea 12, and am unable to see the Glassfish logs without tailing them (Ubuntu) in the file system.
I have the checkbox activated as per the screenshot, but I still only see basic messages like these, but no debug or println messages.
Did I miss a step, or misread the doc?
Admin Port: 4848
Command start-domain executed successfully.
Connected to server

You can edit your application server’s run/debug configuration in IDEA to automatically tail a particular log file (see the “Logs” tab in your server’s run/debug config).
Also make sure that you did not filter logs using the “Log level” combobox in the upper right part of the tab which displays your logs.