Hello Patrick, To see any errors emitted by the EvaluatorFilter, I suggest adding the following line to you configuration file: <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener" /> By the way, have you placed janino.jar in your web-application's class path? HTH, On 16/06/2010 4:45 PM, Sager, Patrick wrote:

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)&& !((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)&& !((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