Affects Version/s: 6.2.X EE, 7.0.0 M4
Since the TRACE log level is missing from the com.liferay.util.log4j.Levels class you cannot select it from the Control Panel.
1. Go to Control Panel/Server Administration/Log Levels
2. Try to set existing log level to TRACE
3. Try to add a new category with TRACE log level
You can do this.
This TRACE log level was made out of the box usable in Log4J version 1.2.12 in 2005 08 29.
In 6.0.x we use version 1.2.16 which was released in 2010 04 06.