Log4j configuration problem

Question

Can anyone explain why every line in the log file is printed twice - this is my log4j configuration file.
thanks...
Liat
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<!-- ===================================================================== -->
<!--                                                                       -->
<!--  Log4j Configuration                                                  -->
<!--                                                                       -->
<!-- ===================================================================== -->
<!-- $Id: log4j.xml,v 1.1 2003/10/29 11:00:45 avir Exp $ -->
<!--
   | For more configuration infromation and examples see the Jakarta Log4j
   | owebsite: http://jakarta.apache.org/log4j
-->
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
         <appender name="FILE" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="./BitbandClient.log"/>
        <param name="Append" value="true"/>
        <!-- Rollover at midnight each day -->
        <param name="DatePattern" value="'.'yyyy-MM-dd"/>
        <!-- Rollover at the top of each hour
        <param name="DatePattern" value="'.'yyyy-MM-dd-HH"/>
        -->
        <layout class="org.apache.log4j.PatternLayout">
            <!-- The default pattern: Date Priority [Category] Message\n -->
            <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>
<!--                            %-4r [%t] %-5p %c %x - %m%n-->
            <!-- The full pattern: Date MS Priority [Category] (Thread:NDC) Message\n
            <param name="ConversionPattern" value="%d %-5r %-5p [%c] (%t:%x) %m%n"/>
             -->
        </layout>
    </appender>
    <!-- ============================== -->
    <!-- Append messages to the console -->
    <!-- ============================== -->
    <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
            <param name="Target" value="System.out"/>
            <param name="Threshold" value="INFO"/>
            <layout class="org.apache.log4j.PatternLayout">
                <!-- The default pattern: Date Priority [Category] Message\n -->
                <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>
            </layout>
    </appender>
     <appender name="BITBAND-CONSOLE" class="org.apache.log4j.ConsoleAppender">
         <param name="Target" value="System.out"/>
         <param name="Threshold" value="DEBUG"/>
         <layout class="org.apache.log4j.PatternLayout">
          <!-- The default pattern: Date Priority [Category] Message\n -->
          <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] - %m%n "/>
         </layout>
    </appender>
    <category name="com.bitband.maestro">
        <priority value="DEBUG"/>
        <appender-ref ref="BITBAND-CONSOLE"/>
        <appender-ref ref="FILE"/>
    </category>
    <!-- ======================= -->
    <!-- Setup the Root category -->
    <!-- ======================= -->
     <root>
         <priority value="INFO"/>
         <appender-ref ref="CONSOLE"/>
         <appender-ref ref="FILE"/>
    </root>
</log4j:configuration>

Answer 1

You're just begging for a [url http://en.wikipedia.org/wiki/RTFM]four-letter response :-)
http://logging.apache.org/log4j/docs/manual.html
The addAppender method adds an appender to a given logger. Each enabled logging request for a given logger will be forwarded to all the appenders in that logger as well as the appenders higher in the hierarchy. In other words, appenders are inherited additively from the logger hierarchy. For example, if a console appender is added to the root logger, then all enabled logging requests will at least print on the console. If in addition a file appender is added to a logger, say C, then enabled logging requests for C and C's children will print on a file and on the console. It is possible to override this default behavior so that appender accumulation is no longer additive by setting the additivity flag to false.