src/java/org/apache/log4j/xml/examples/sample4.xml

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE log4j:configuration >

<log4j:configuration xmlns:log4j='http://logging.apache.org/' debug="true">

	<appender name="ASYNC" class="org.apache.log4j.AsyncAppender">
	        <appender-ref ref="TEMP"/>
	</appender>

	<appender name="TEMP" class="org.apache.log4j.FileAppender">
		<param name="File" value="temp"/>
		<layout class="org.apache.log4j.PatternLayout">
  		     <param name="ConversionPattern" 
                            value="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
		</layout>
	</appender>

	<root>
		<priority value="debug"/>
		<appender-ref ref="ASYNC"/>
	</root>
</log4j:configuration>