How to use log4j.xml in java

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Java

my logger.xml file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="true">
<appender name="FILE" class="org.apache.log4j.FileAppender">
<param name="File" value="log/PacketLog.log"/>
<param name="Append" value="true"/>
         <layout class="org.apache.log4j.PatternLayout">
                    <param name="ConversionPattern" value="[%d{yyyy-MM-dd hh:mm:ss z}] %5p [%c]{2}:%l - %m%n"/>
        </layout>
</appender>

   <root>
      <level value="INFO"/>
      <appender-ref ref="FILE"/>
   </root>

</log4j:configuration>

while running i'm getting this. . . Anyone plz help me
run:
log4j: reset attribute= "false".
log4j: Threshold ="null".
log4j: Level value for root is [INFO].
log4j: root level set to INFO
log4j: Class name: [org.apache.log4j.FileAppender]
log4j: Setting property [file] to [log/PacketLog.log].
log4j: Setting property [append] to [true].
log4j: Parsing layout of class: "org.apache.log4j.PatternLayout"
log4j: Setting property [conversionPattern] to [[%d{yyyy-MM-dd hh:mm:ss z}] %5p [%c]{2}:%l - %m%n].
log4j: setFile called: log/PacketLog.log, true
log4j: setFile ended
log4j: Adding appender named [FILE] to category [root].