log4j即使已经定义了logger，也无法找到记录器的appender

Question

My Log4j.xml file ( log4j 1.2.15)

<appender name="Append1" class="org.apache.log4j.FileAppender"> 
   <param name="File" value="tomcat/log.out"/>
   <param name="Append" value="true"/> 
   <param name="Threshold" value="DEBUG"/>
   <layout class="org.apache.log4j.PatternLayout"> 
       <param name="ConversionPattern" value="%d %-5p [%c] (%t) %m%n"/>
   </layout>
</appender>

logger level :

<logger name="xx.yy.zzzz.Controller" additivity="false">
     <level value="DEBUG"/>
     <appender-ref ref="Append1"/>
</logger>

Log in catalina file :

  log4j: Setting property [file] to [/log.out].
  log4j: Setting property [append] to [true].
  log4j: Setting property [threshold] to [DEBUG].
  log4j: Parsing layout of class: "org.apache.log4j.PatternLayout"
  log4j: Setting property [conversionPattern] to [%d %-5p [%c] (%t) %m%n].
  log4j: setFile called: log.out, true
  log4j: setFile ended
  log4j: Retreiving an instance of org.apache.log4j.Logger.
  log4j: Setting [xx.yy.zzzz.Controller] additivity to [false].
  log4j: Level value for xx.yy.zzzz.Controller is [DEBUG].
  log4j: **xx.yy.zzzz.Controller level set to DEBUG**
  log4j: Adding appender named [Append1] to category [xx.yy.zzzz.Controller].

我们有此警告消息，我们没有跟踪

  log4j:WARN No appenders could be found for logger (xx.yy.zzzz.Controller).
  log4j:WARN Please initialize the log4j system properl

和。

java类：

 public final class Controller {
  private static Logger LOGGER = Logger.getLogger(Controller.class);

     public method1(){
        LOGGER.debug("test")
     }

  }