[LOG4J2-2000] Highlight converter converts levels to uppercase before lookup

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.2
• Component/s: Configurators
• Assignee: Unassigned
• Reporter: Paul Burrowes
• Created: 03/Aug/17 04:18
• Updated: 28/Aug/17 04:20

Description

If using custom levels that are not uppercase e.g. those in javax.slee.facilities.TraceLevel HighlightConverter cannot map colours to the levels because it converts the key to uppercase before lookup:

            final String key = entry.getKey().toUpperCase(Locale.ENGLISH);

The toUpperCase() is unnecessary for style lookup because this already performs a case-insensitive match on the key.

Possible solutions:

• After fixing LOG4J2-1999, remove the toUpperCase() and just use the key as-is (breaks config that expects the toUpperCase() behaviour)
• Use a case-insensitive match in Level.toLevel() instead of toUpperCase() or fall-back to case-insensitive after trying case-sensitive (affects performance)
• In combination with one of the above, introduce a flag to enable or disable non-uppercase level configuration.