What is a (the?) minimal logger.properties that turns off all logging? - log4cxx

Question

I have an application that uses log4cxx internally, with dozens of loggers. What is a minimal logger.properties that I can setup to turn off all logging output?
In particular I'm getting a warning like (no properties file present):
log4cxx: No appender could be found for logger (FileSource).
log4cxx: Please initialize the log4cxx system properly.
FileSource is a class that uses log4cxx.
My goal is to preclude all log4cxx output at runtime.

Answer 1

This should do it:
<?xml version="1.0" encoding="UTF-8" ?>
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<root>
<priority value="OFF" />
</root>
</log4j:configuration>
A simple logger.properties that logs to standard out could look like below:
<?xml version="1.0" encoding="UTF-8" ?>
<!-- add attribute debug="true" to log4j:configuration tag to see how logger reads it's configuration. -->
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="ConsoleAppender" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.out"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p %c (%F:%M:%L) - %m%n" />
</layout>
</appender>
<root>
<priority value="DEBUG" />
<appender-ref ref="ConsoleAppender"/>
</root>
</log4j:configuration>