src/test/resources/input/xml/DOMInvalidLevel.xml

<log4j:configuration xmlns:log4j=' '>
  <appender name="TEMP" class="FileAppender">
    <filter class="LevelMatchFilter">
      <param name="LevelToMatch" value=" #Filter"/>
    </filter>
  </appender>

  <root>
    <appender-ref ref="TEMP"/>
  </root>
</log4j:configuration>