log4j and java.util.logging

	log4j	java.util.logging
Manager class	org.apache.log4j.LogManager	java.util.logging.LogManager
Logger objects	org.apache.log4j.Logger	java.util.logging.Logger
Named loggers	Supported	Supported
Logging levels	Levels are declared in theorg.apache.log4j.Level class. log4j has five pre-defined levels: FATAL ERROR WARN INFO DEBUG	Levels are declared in thejava.util.logging.Level class. There are seven pre-defined levels: SEVERE WARNING INFO CONFIG FINE FINER FINEST
Log event object	org.apache.log4j.spi.LoggingEvent	java.util.logging.LogRecord
Output destinations	Appender classes. These classes implement theorg.apache.log4j.Appender interface.	Handler classes. These classes extendjava.util.logging.Handler.
Output message filtering	Filter classes. These classes extendorg.apache.log4j.spi.Filter.	Filter classes. These classes must implement thejava.util.logging.Filter interface.
Output message formatting	Layout classes extend org.apache.log4j.Layout.	Formatter classes extendjava.util.logging.Formatter.
Programmatic configuration	Supported	Supported
Property file configuration	Supported	Supported
XML configuration	Supported. The XML configuration file must comply with log4j.dtd.	Not supported
Email notification	SMTPAppender class	SMTPHandler class (third-party extension)

[출처 : http://onjava.com/pub/a/onjava/2004/09/29/smtp-logging.html]