[logback-user] Filter does not work on tomcat

[Sager, Patrick]

Hello

I'm using a filter expression to determine the format of my log message.
When running the configuration within my JUnit tests, the filter works
perfectly.
However, when running on a tomcat v6.0 server (within eclipse), the
filter gets ignored and all log entries are written twice.

Here's the extract of my logback.xml file:

  <!-- Log file for events with an explicitly defined source -->
    <appender name="ROLLING_LOG_WITH_SOURCE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!--  Accept only messages with an explicit source -->
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">

            <evaluator>
                <expression>(mdc.get("source") != null)  &amp;&amp;
!((String)mdc.get("source")).isEmpty()</expression>
            </evaluator>
            <OnMatch>ACCEPT</OnMatch>
            <OnMismatch>DENY</OnMismatch>          
        </filter>        
        <file>/etc/foe/logs/LogFile.log</file>
        <rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- rollover monthly and compression of log history -->
 
<fileNamePattern>TestLogFile-%d{yyyy-MM}.%i.zip</fileNamePattern>
            <maxHistory>12</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
 
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <!-- or whenever the file size reaches 1MB -->
                <maxFileSize>1MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>%-5level %date{yyyy-MM-dd HH:mm:ss.SSS} [%thread]
[%X{source}] %msg%n</pattern>
        </encoder>
    </appender>    
    
    <!-- Log file for events with no explicitly defined source -->
    <appender name="ROLLING_LOG_WITHOUT_SOURCE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!--  Accept discard messages with an explicit source -->
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">

            <evaluator>
                <expression>(mdc.get("source") != null)  &amp;&amp;
!((String)mdc.get("source")).isEmpty()</expression>
            </evaluator>
            <OnMatch>DENY</OnMatch>
            <OnMismatch>ACCEPT</OnMismatch>          
        </filter>        
        <file>/etc/foe/logs/LogFile.log</file>
        <rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- rollover monthly and compression of log history -->
 
<fileNamePattern>TestLogFile-%d{yyyy-MM}.%i.zip</fileNamePattern>
            <maxHistory>12</maxHistory>
            <timeBasedFileNamingAndTriggeringPolicy
 
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <!-- or whenever the file size reaches 1MB -->
                <maxFileSize>1MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>%-5level %date{yyyy-MM-dd HH:mm:ss.SSS} [%thread]
[%file:%line] %msg%n</pattern>
        </encoder>
    </appender>

Is this a known issue, that LogBack does not support filters under
tomcat?

Thanks for any help
-- Patrick