jbuilder log4j 编译时的问题

D:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "D:\Borland\JBuilder2005\thirdparty\jakarta-tomcat-4.1.30\bin\bootstrap.jar;D:\Borland\JBuilder2005\jdk1.4\lib\tools.jar"  "-Dcatalina.home=D:/Borland/JBuilder2005/thirdparty/jakarta-tomcat-4.1.30"  org.apache.catalina.startup.Bootstrap -config E:\VVCN\Tomcat\conf\server8080.xml start log4j:WARN No appenders could be found for logger (org.apache.commons.digester.Digester).
log4j:WARN Please initialize the log4j system properly.编译程序时出现 log4j 的问题，请问怎么解决