Posted on 2007-01-09 18:42
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自從用上了tomcat5.5，發(fā)現(xiàn)日志信息沒了，出錯了也找不著有用的信息，上apache找答案，果然
Tomcat 5.5 uses Commons Logging throughout its internal code allowing the developer to choose a logging configuration that suits their needs, e.g java.util.logging or Log4J. Commons Logging provides Tomcat the ability to log hierarchially across various log levels without needing to rely on a particular logging implementation.
An important consequence for Tomcat 5.5 is that the <Logger> element found in previous versions to create a localhost_log is no longer a valid nested element of <Context>. Instead, the default Tomcat configuration will use java.util.logging. If the developer wishes to collect detailed internal Tomcat logging (i.e what is happening within the Tomcat engine), then they should configure a logging system such as java.util.logging or log4j as detailed next
習慣用log4j來配置log信息的輸出。
新建log4j.properties，內(nèi)容為
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 [%t] %-5p %c - %m%n
log4j.appender.Console.layout.ConversionPattern=%d{yy-MM-dd HH:mm:ss} %5p %c{1}:%L - %m%n
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=${catalina.home}/logs/tomcat.log
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d{yyyy.MM.dd HH:mm:ss} %5p %c{1}(%L):? %m%n
log4j.logger.org.apache=info, R
log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=DEBUG, R
log4j.logger.org.apache.catalina.core=info, R
log4j.logger.org.apache.catalina.session=info, R
最后四行是tomcat的信息，如果改為debug日志文件將十分龐大。
將這個文件放入${catalina.home}/common/classes下，再將log4j.jar和commons-logging.jar放入${catalina.home}/common/lib下，就可以在${catalina.home}/logs/下見到日志了。