log4j:WARN No appenders could be found for logger

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本文介绍了解决使用JDBC连接数据库时出现的log4j警告问题的方法。通过配置log4j.properties文件，设置日志级别、日志文件路径及大小等参数，有效地解决了日志系统的配置缺失问题。

使用JDBC连接数据库时，报如下错：
log4j:WARN No appenders could be found for logger (org.apache.hive.jdbc.Utils).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

解决：
在src目录下新建log4j.properties
-------------------------------------------------------
inceptor.root.logger=INFO,RFA
inceptor.log.dir=/usr/lib/ngmr/logs
inceptor.log.file=spark.log

# Define the root logger to the system property "hadoop.root.logger".
log4j.rootLogger=${inceptor.root.logger}

# Set everything to be logged to the console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c: %m%n

# output to file
log4j.appender.RFA=org.apache.log4j.RollingFileAppender
log4j.appender.RFA.File=${inceptor.log.dir}/${inceptor.log.file}
# The MaxFileSize can be 512KB
log4j.appender.RFA.MaxFileSize=10MB
# Keep three backup files.
log4j.appender.RFA.MaxBackupIndex=1024
# Pattern to output: date priority [category] - message
log4j.appender.RFA.layout=org.apache.log4j.PatternLayout
log4j.appender.RFA.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c: %m%n

# Ignore messages below warning level from Jetty, because it's a bit verbose
log4j.logger.org.eclipse.jetty=WARN