Custom module logging to a separate file (on top of usual logging)

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I “guess” I’m getting closer, I did this in my custom module:

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

  <appender name="INITIALIZER_LOGFILE_APPENDER" class="org.apache.log4j.RollingFileAppender">
    <param name="append" value="false"/>
    <param name="file" value="initializer.log"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%p - %C{1}.%M(%L) |%d{ISO8601}| %m%n" />
    </layout>
  </appender>

  <logger name="org.openmrs.module.initializer" additivity="false">
    <level value="INFO"/>
    <appender-ref ref="INITIALIZER_LOGFILE_APPENDER"/>
  </logger>

  <root>
    <appender-ref ref="INITIALIZER_LOGFILE_APPENDER"/>
  </root>

</log4j:configuration>

Things seem to work fine (based on what I observe within tests). However at runtime the log file is nowhere to be found… I was taking the inspiration from this line:

<param name="file" value="openmrs.log"/>

Of course I could provide a path such as /opt/openmrs/initializer.log but this would make me bump into access rights issues. What would be the way to specify a path inside the app data dir?

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