Mersoft Corporation Blog

Are you seeing duplicate or multiple log messages using log4j xml configuration?
The configuration below produces three log messages.
log4j.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="console" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="%-5p %c{1} – %m%n" />
    </layout>
  </appender>
  <logger name="com.acme.LoggingTest">
    <level value="debug" />
    <appender-ref ref="console" />
  </logger>
  <logger name="com.acme">
    <level value="debug" />
    <appender-ref ref="console" />
  </logger>
  <root>
    <priority value="debug" />
    <appender-ref ref="console" />
  </root>
</log4j:configuration>

LoggingTest.java:

package com.acme;
public class LoggingTest {
  
  private [...]