如何使logger.trace（）和logger.info（）一起工作

Question

I have an issue logging TRACE function in distinct file from INFO function, i prepared a classic log4j.xml file containing all the required configuration.

logger.info() is working.
logger.trace() is not working.

         <appender name="file" class="org.apache.log4j.FileAppender">
            <param name="append" value="true" />
            <param name="file" value="C:/logs/transaction.log" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter">
                <param name="LevelMin" value="TRACE" />
                <param name="LevelMax" value="TRACE" />
                <param name="AcceptOnMatch" value="true" />
            </filter>
        </appender>

        <appender name="fileINFO" class="org.apache.log4j.FileAppender">
            <param name="append" value="true" />
            <param name="file" value="C:/logs/server.log" />
            <layout class="org.apache.log4j.PatternLayout">
                <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
            </layout>
            <filter class="org.apache.log4j.varia.LevelRangeFilter">
                <param name="LevelMin" value="INFO" />
                <param name="LevelMax" value="INFO" />
                <param name="AcceptOnMatch" value="true" />
            </filter>
        </appender>

        <logger name="ma.prg.net">
            <level value="trace" />
            <appender-ref ref="file" />
        </logger>

        <logger name="ma.prg.net">
            <level value="info" />
            <appender-ref ref="fileINFO" />
        </logger>

logger.trace() was working fine before i added fileINFO appender.

Thanks in advance.

Answer 1

You cannot configure the same logger twice. Just change your logger configuration to:

<logger name="ma.prg.net">
  <level value="trace" />
  <appender-ref ref="file" />
  <appender-ref ref="fileINFO" />
</logger>

With this you send the logging message to both appenders. But as you already configured each appender individually with LevelMin and LevelMax , each filters out the messages it should print.