为什么我们在tomcat logging.properties中需要两次写处理程序？

From docs:

handlers = 1catalina.org.apache.juli.FileHandler, \
       2localhost.org.apache.juli.FileHandler, \
       3manager.org.apache.juli.FileHandler, \
       java.util.logging.ConsoleHandler

.handlers = 1catalina.org.apache.juli.FileHandler, 
       java.util.logging.ConsoleHandler
handlers = 1catalina.org.apache.ju