How To Attach AsyncAppender To Your Other Appenders

In your log4j.xml, define the AsyncAppender and reference the other appenders that you want to attach to it.

appender name="ASYNC" class="org.apache.log4j.AsyncAppender"
appender-ref ref="STDOUT"
appender

appender name=STDOUT" class="org.apache.log4j.ConsoleAppender"
layout class="org.apache.log4j.PatternLayout"
param name="ConversionPattern" value="%d{HH:mm:ss:SSS} %-5p %C:%L %M() %m%n"
layout
appender

Then define ASYNC as your root logger.

root
appender-ref ref="ASYNC"
root