CODEWITHSUNDEEP
log4j
benhsu
benhsu

Reputation: 5546

How do I configure log4j using log4j.xml to append to different log files based on class name?

I want to set up log4j so that all log meessages produced from classes under package com.foo.bar go to bar.log, and all the log meessages produced from classes under package com.bar.blatz go to blatz.log.

Questions

Upvotes: 27

Views: 54951

Answers (2)

Sharat
Sharat

Reputation: 9

  <root>
        <level value="INFO"/>
        <!-- no appender, output will be swallowed (I think) -->
  </root>

We can add appenders here. It will work if the application is using root logger. for example quartz Scheduler API.

Upvotes: -4

araqnid
araqnid

Reputation: 133712

This is based on my answer to a similar question:

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <!-- general application log -->
    <appender name="BarLogFile" class="org.apache.log4j.FileAppender">
        <param name="File" value="bar.log" />
        <param name="Threshold" value="INFO" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %t [%-40.40c] %x - %m%n"/>
        </layout>
    </appender> 

    <!-- additional fooSystem logging -->
    <appender name="BlatzLogFile" class="org.apache.log4j.FileAppender">
        <param name="File" value="blatz.log" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %t [%-40.40c] %x - %m%n"/>
        </layout>
    </appender>

    <logger name="com.foo.bar">
        <appender-ref ref="BarLogFile"/>
    </logger>

    <logger name="com.bar.blatz">
        <appender-ref ref="BlatzLogFile"/>
    </logger>

    <root>
        <level value="INFO"/>
        <!-- no appender, output will be swallowed (I think) -->
    </root>
</log4j:configuration>

If you add an appender-ref to the root element, it will also receive com.foo.bar etc messages. You can stop that by specifying 'additivity="false"' on the loggers.

Upvotes: 39

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