How to apply multiple filters to single appender

[Praveen Kumar Hasthalapuram <pr...@gmail.com>]

How can we apply multiple filters (more than one filter) to single appender?

I have a custome filter(StringMatchFilter), which will filter based on given
string.

I have configured as given below. but filter is happening on only first
filter, second filter is ignored.
But, If i use different appenders it is working.

<appender name="A1" class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="file1.log"/>
        <param name="Append" value="true"/>
        <param name="MaxFileSize" value="10MB"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}
[%p] %m%n"/>
        </layout>

 <!-- To filter with string "SNMP"  -->
 <filter class="com.cisco.nettools.logger.filters.StringMatchFilter">
     <param name="stringToMatch" value="SNMP"/>
     <param name="matchReturnValue" value="accept"/>
     <param name="noMatchReturnValue" value="deny"/>
   </filter>

 <!-- To filter with string "PING"  -->

   <filter class="com.cisco.nettools.logger.filters.StringMatchFilter">
     <param name="stringToMatch" value="PING"/>
     <param name="matchReturnValue" value="accept"/>
     <param name="noMatchReturnValue" value="deny"/>
   </filter>

</appender>

Thanks In Advance,
Praveen