src/test/resources/input/xml/asyncWithFallback.xml

<?xml version="1.0" encoding="UTF-8" ?>
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
  <appender name="Primary" class="FileAppender">
    <param name="File" value="${PROGRAM_FILE_PATH.PARENT_PATH}/${PROGRAM_FILE_PATH.STEM}-Primary.log" />
    <param name="Append" value="false"/>
    <param name="FailOnMessage" value="message 1000"/>
    <layout class="PatternLayout">
      <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n"/>
    </layout>
  </appender>
  <appender name="Backup" class="FileAppender">
    <param name="File" value="${PROGRAM_FILE_PATH.PARENT_PATH}/${PROGRAM_FILE_PATH.STEM}-Backup.log" />
    <param name="Append" value="false"/>
    <layout class="PatternLayout">
      <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n"/>
    </layout>
  </appender>
  <appender name="ASYNC" class="AsyncAppender">
    <appender-ref ref="Primary" fallback-ref="Backup"/>
  </appender>
  <root>
    <priority value ="INFO" />
    <appender-ref ref="ASYNC" />
  </root>
</log4j:configuration>