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------- Additional Comments From [EMAIL PROTECTED]  2006-01-04 20:01 -------
There are a couple of reasons that I'm not in favor of these changes:

1. I have a personal dislike of the MessageFormatter work-alike methods being 
on Logger to begin 
with.  I think they actually should be in a helper class which would allow the 
user to select which 
formatter they use (MessageFormatter or the JDK 1.5 formatter) and should be 
the actual JDK 
implementation and not a log4j subset of the MessageFormatter.

2. The motivation for the debug methods is to avoid the cost of formatting the 
message if the debug 
messages are being suppressed.  However, info and higher messages are generally 
enabled, so their is 
no significant optimization savings for short-cutting the formatter.  In these 
cases, use:

logger.warn(new MessageFormatter("foo {}").format(someObj))

3. Since throwing and catching an exception should are expensive, should be 
rare, and should result in 
a high level, the potential for optimization by deferring formatting again 
should be minimal.  In these 
cases, use:

logger.warn(new MessageFormatter("foo {}").format(someObj), t);

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