Can I change log4j configuration programatically?

[vincentw]

Hi I'm new to using log4j and would like to know if I can change the
configuration of log4j while it is already running.  I have passed my
log4j.xml to the DOMConfigurator and then I would like to change some
settings.

Here is my log4j.xml file
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/";
debug="false">

  <!-- ==========Appenders========== -->
  <!-- Define asyncAppender -->
  <appender name="ASYNC" class="org.apache.log4j.AsyncAppender">
        <filter class="com.apani.common.log.RepeatFilter"/>
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="R"/>
  </appender>
  <!-- Define STDOUT to a console -->
  <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
          value="%d{ISO8601} %-17X{ipAddress} [%t] [%p] - %m%n"/>
    </layout>
  </appender>
  <!-- Define R; Rolling file logger -->
  <appender name="R" class="org.apache.log4j.RollingFileAppender">
      <param name="File" value="logs/adminlog.txt"/>
      <param name="MaxFileSize" value="100KB"/>
      <param name="MaxBackupIndex" value="1"/>
      <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern"
            value="%d{ISO8601} %-17X{ipAddress} [%t] [%p] - %m%n"/>
      </layout>
  </appender>

        <logger name="sql">
                <level value="off"/>
        </logger>
                
  <!-- ==========Setup the Root category========== -->
  <!-- rules for logging DEBUG<INFO<WARN<ERROR<FATAL. -->
  <root>
        <priority value = "error"/>
    <appender-ref ref="ASYNC"/>
  </root>
</log4j:configuration>


Now based on a user config file, I would like to change some of the config
such as the MaxFileSize of the rolling file appender or the number of backup
logs it keeps.  I would also like to change the logging level of root or
sql.

Is it possible to to this?  If so, how do I go about doing this?

Thanks in advance
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