How to Monitor the size of log file (Log4j) During its Generation.

Question

i have made a program using log4j technology. Now i want to know that is there any method that i can restrict the size of the log file. for example if the size of generating log file exceeds the restricted size then it should be placed in backup and a new file should be automatically generate and remaining contents should be written in that file.
is there any method that can monitor the size of file during the generation of that (say) log file.
Waiting for ur Urgent response

Answer 1

I have wrote that code
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="appender" class="org.apache.log4j.FileAppender">
<param name="File" value="c:\\abc.txt"/>
<param name="MaxFileSize" value="100B"/>
<param name="MaxBackupIndex" value="3"/>
<param name="Append" value="false"/>
<layout class="org.apache.log4j.SimpleLayout"></layout>
</appender>
<root>
<priority value ="debug"/>
<appender-ref ref="appender"/>
</root>
</log4j:configuration>
When i run it it gave me error Message
log4j:WARN No such property [maxFileSize] in org.apache.log4j.FileAppender.
log4j:WARN No such property [maxBackupIndex] in org.apache.log4j.FileAppender.