* http://kimddochi.tistory.com/103
 * pom.xml
{{{
          <dependency>    <!----------------------------------------------- ⓐ -->
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
            <exclusions>
                <!-- Exclude Commons Logging in favor of SLF4j -->
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                 </exclusion>
            </exclusions>
        </dependency>
        <dependency>    <!----------------------------------------------- ⓑ -->
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${org.slf4j.version}</version>
            <scope>runtime</scope>
        </dependency>
	<dependency>    <!----------------------------------------------- ⓒ -->
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${org.slf4j.version}</version>
        </dependency>
}}}
 * log4j.xml
{{{
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration PUBLIC "-//LOGGER" "log4j.dtd">
 
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 
	<!-- Appenders -->
    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="[%d{yyyy-MM-dd HH:mm}] %5p [%C{1}(%M:%L)] :%m%n%n" />
        </layout>
    </appender>
 
	<!-- 3rdparty Loggers -->
    <logger name="org.springframework" additivity="false">
        <level value="INFO" />
        <appender-ref ref="console"/>
    </logger>
 
	<!-- Root Logger -->
    <root>
        <level value="INFO" />
        <appender-ref ref="console" />
    </root>
    
</log4j:configuration>
}}}