See http://www.slf4j.org/ Javadocs for the Log4jLoggerAdapter are available at http://www.slf4j.org/api/org/slf4j/impl/Log4jLoggerAdapter.html
'org.slf4j13:slf4j-log4j13:1.0-beta9'
<dependency>
<groupId>org.slf4j13</groupId>
<artifactId>slf4j-log4j13</artifactId>
<version>1.0-beta9</version>
</dependency>
<dependency org="org.slf4j13" name="slf4j-log4j13" rev="1.0-beta9"/>
"org.slf4j13", "slf4j-log4j13", "1.0-beta9"