Traces from custom module stop printing after redeploy

Issue

• A custom module prints traces the first time it's deployed but not if redeployed.
• After restarting Liferay it works again.

Environment

• Quarterly Release 2023.Q3, 2023.Q4, 2024.Q1
• Liferay DXP 7.4

Resolution

• This can happen if the configuration file module-log4j.xml uses an element <level> inside of <logger> instead of adding it as an attribute.
• So, instead of

  <Loggers>
      <logger name="testlog4j2redeploy.portlet.TestLog4J2RedeployPortlet" additivity="false">
          <level value="info"/>
          <appender-ref ref="TestLog4J2RedeployPortletLogFile" />
      </logger>
  </Loggers>

  use
  

  <Loggers>
      <logger level="info" name="testlog4j2redeploy.portlet.TestLog4J2RedeployPortlet" additivity="false">
         <appender-ref ref="TestLog4J2RedeployPortletLogFile" />
      </logger>
  </Loggers>