Log4jVsZeroLog

	log4j	zero-log
How to use?	val logger = LoggerFactory.getLogger(classOf[MyClass])	val (logger, formatter) = ZeroLoggerFactory.newLogger(this) import formatter._
Overhead for determining if a logging statement should be logged or not	About 5 nanoseconds (Overhead from log4j), and... 20 ~ 100 nanoseconds (Overhead for boxing / unboxing / varargs)	Exact 0 (When using compile-time configuration), or... Less than 1 nanosecond (When using run-time configuration)
Support Scala	Yes	Yes
Support Java	Yes	No
Configuration file format	properties or XML	Scala
Static syntax checking for configuration	No	Yes (By scalac)
Support scala.util.logging.Logged	No	Yes
Support scalac -Xelide-below	No	Yes
Support run-time configuration	Yes	Yes
Support compile-time configuration	No	Yes
Does run-time configuration and compile-time configuration have same syntax?	N/A	Yes
Can configuration be debugged?	No	Yes
Number of appender implementations	Many	Few (Contribute yours!)
Number of formatter implementations	Many	Few (Contribute yours!)
Speed of formatting log messages	Slow (Creating dozens of temporary objects with dozens of boxing / unboxing overhead)	Very fast