LOG4J XML CONFIGURATION. PUT IT ON CLASSPATH ROOT

! log4j.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{ABSOLUTE} %5p %c{1}:%L - %m%n"/>
        </layout>
    </appender>

    <!--Turn on your favourite loggers-->
    <logger name="org.hibernate">
        <level value="INFO"/><!--or DEBUG for more verbose logging-->
    </logger>
    <logger name="org.hibernate.SQL">
        <level value="DEBUG"/>
    </logger>

    <root>
        <level value="WARN"/>
        <appender-ref ref="stdout"/>
    </root>
</log4j:configuration>

log4j.properties

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

# set up root logger level
log4j.rootLogger=warn, stdout

# set up your favourite loggers levels
log4j.logger.org.hibernate=info
log4j.logger.org.hibernate.SQL=info

LogLevels.txt

More verbose
------------
* TRACE
* DEBUG
* INFO
* WARN
* ERROR
* FATAL
------------
Less verbose

Custom log level are supported

Main.java

public class Main {
    private static Logger log = Logger.getLogger(Main.class);
}