java出现以下警告：WARN No appenders;WARN Please initialize the log4j的处理方法

Posted 2020-10-16 扫地猿

编译java或引用别的代码时出现以下警告：

log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

出现这个的原因是没有初始化log4j配置导致的

这个是个警告如果不上心可以不管，如果想去掉或者把日志记录下来，就要在程序中处理一下。

1.在src同级目录下新建文件夹config，config内新建文件log4j.properties，文件内容如下，每个配置的详细说明请见：http://www.cnblogs.com/likui360/p/7992982.html  可以根据自己的需求进行调整。

 

log4j.rootCategory=INFO, stdout , R   
   
log4j.appender.stdout=org.apache.log4j.ConsoleAppender   
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout   
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n   
    
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender   
log4j.appender.R.File=D:\\\\Tomcat 5.5\\\\logs\\\\qc.log   
log4j.appender.R.layout=org.apache.log4j.PatternLayout   
1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n   
   
log4j.logger.com.neusoft=DEBUG   
log4j.logger.com.opensymphony.oscache=ERROR   
log4j.logger.net.sf.navigator=ERROR   
log4j.logger.org.apache.commons=ERROR   
log4j.logger.org.apache.struts=WARN   
log4j.logger.org.displaytag=ERROR   
log4j.logger.org.springframework=DEBUG   
log4j.logger.com.ibatis.db=WARN   
log4j.logger.org.apache.velocity=FATAL   
   
log4j.logger.com.canoo.webtest=WARN   
   
log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN   
log4j.logger.org.hibernate=DEBUG   
log4j.logger.org.logicalcobwebs=WARN  

log4j.rootCategory=INFO, stdout , R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n
 
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=D:\\\\Tomcat 5.5\\\\logs\\\\qc.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
1log4j.appender.R.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n

log4j.logger.com.neusoft=DEBUG
log4j.logger.com.opensymphony.oscache=ERROR
log4j.logger.net.sf.navigator=ERROR
log4j.logger.org.apache.commons=ERROR
log4j.logger.org.apache.struts=WARN
log4j.logger.org.displaytag=ERROR
log4j.logger.org.springframework=DEBUG
log4j.logger.com.ibatis.db=WARN
log4j.logger.org.apache.velocity=FATAL

log4j.logger.com.canoo.webtest=WARN

log4j.logger.org.hibernate.ps.PreparedStatementCache=WARN
log4j.logger.org.hibernate=DEBUG
log4j.logger.org.logicalcobwebs=WARN 

 

2.在程序中导入：

import org.apache.log4j.Logger;
import org.apache.log4j.Priority;
import org.apache.log4j.PropertyConfigurator;

3.程序第一行加入初始化语句：

PropertyConfigurator.configure("config/log4j.properties");

重新编译，输出的内容中不再有警告信息，如果想看到就直接把log4j.rootCategory设置成OFF。

 

log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.