A DESCRIPTION OF THE REQUEST :
It would be nice if there were printf-style, varargs methods for logging in the Logger class.

JUSTIFICATION :
Being able to specify: logger.log(Level.DEBUG, "yada yada %s %s %s", s1, s2, s3, ex); Could increase performance by allowing the string concat & formatting to only take place if the debug level enable. This would clean up a lot of code that currently does:

if(logger.isDebugEnabled() {
   logger.log(level.DEBUG, "yada yada" + s1 + s2 + s3", ex);
}

If the last argument in the vararg list is a throwable, then it could be considered the "thrown" argument.