tomcat错误日志详细
将日志jar包copy至common\lib下面去（log4j.jar和common-logging.jar）将log4j.properties文件放到common\classes文件夹下面
需要包：
commons-logging.jar
log4j-1.2.8.jar
log4j.properties文件内容如下：
log4j.rootLogger=info,Console,R
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d{yy-MM-dd HH:mm:ss}%5p %c{1}:%L-%m%n
log4j.appender.R=org.apache.log4j.DailRollingFileAppender
log4j.appender.R.File=${catalina.home}/logs/tomcat.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d{yyyy.MM.dd HH:mm:ss} %5p %c{1}(%L):?%m%n
log4j.logger.org.apache=info,R
log4j.logger.org.apache.catalina.core.ContainerBase..=DEBUG,R
log4j.logger.org.apache.catalina.core=info,R
log4j.logger.org.apache.catalina.session=info,R
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