log4j 我在log配置文件，提示SetFile错误。
这个是log4jconf.cfg文件。
log4j.rootLogger=info, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
# Pattern to output the caller 's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=./logs/snmpMgrLog
log4j.appender.R2=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R2.File=./logs/hdmsUserLog
log4j.appender.R3=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R3.File=./logs/AlarmLog
log4j.appender.R4=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R4.File=./logs/unSolved
log4j.appender.R5=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R5.File=./logs/snoop
log4j.appender.R.DatePattern= '. 'yyyy-MM-dd
log4j.appender.R2.DatePattern= '. 'yyyy-MM-dd
log4j.appender.R3.DatePattern= '. 'yyyy-MM-dd
log4j.appender.R4.DatePattern= '. 'yyyy-MM-dd
#log4j.appender.R5.DatePattern= '. 'yyyy-MM-dd
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R2.layout=org.apache.log4j.PatternLayout
log4j.appender.R3.layout=org.apache.log4j.PatternLayout
log4j.appender.R4.layout=org.apache.log4j.PatternLayout
log4j.appender.R5.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d %p %t %c - %m%n
log4j.appender.R2.layout.ConversionPattern=%d - %m%n
log4j.appender.R3.layout.ConversionPattern=%m%n
log4j.appender.R4.layout.ConversionPattern=%m%n
log4j.appender.R5.layout.ConversionPattern=%m%n
# Print only messages of level WARN or above in the package com.foo.
log4j.logger.cn.com.pbi.netmgr.local.content=info, R
log4j.logger.cn.com.pbi.netmgr.local.resource=info, R
log4j.logger.cn.com.pbi.netmgr.local.etc = info, R2
log4j.logger.cn.com.pbi.netmgr.alarm.logging.saver.LogOutput = info, R3
log4j.logger.cn.com.pbi.netmgr.web.morning.resource.MenuMgrBean =info, R5
log4j.logger.cn.com.pbi.netmgr.alarm.logging.saver.UnSolvedEventSaver = info, stdout,R4
我启动服务器时，报错，我在 WEB-Inf下放置一个log文件夹,log4j应该是在配置时,自动生成一个snoop文件,但是他怎么说是空的呢.setFile(null,true)两个参数是什么意义呢,我启动的时候没有调用cn.com.pbi.netmgr.web.morning.resource.MenuMgrBean里的东西.开始setFile的东西肯定是为空的.可是我就是找不出什么问题.大虾救命啊
log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: .\logs\snoop (系统找不到指定的路径。)
at java.io.FileOutputStream.openAppend(Native Method)
at java.io.FileOutputStream. <init> (Unknown Source)
at java.io.FileOutputStream. <init> (Unknown Source)
at org.apache.log4j.FileAppender.setFile(FileAppender.java:273)
at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:152)
at org.apache.log4j.DailyRollingFileAppender.activateOptions(DailyRollingFileAppender.java:206)
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:247)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:123)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:87)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:645)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:603)
at org.apache.log4j.PropertyConfigurator.parseCatsAndRenderers(PropertyConfigurator.java:524)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:408)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:307)
at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:315)
at cn.com.pbi.netmgr.local.SnmpManager.initLogger(SnmpManager.java:87)
at cn.com.pbi.netmgr.web.morning.MainContextListener.contextInitialized(MainContextListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3729)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4187)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
log4j:ERROR Either File or DatePattern options are not set for appender [R5].
[解决办法]
用绝对路径，如果是相对路径的话需要在前面定义。
[解决办法]
java.io.FileNotFoundException: .\logs\snoop (系统找不到指定的路径。)
[解决办法]
定义一个path属性
[解决办法]
./logs/snoop
这样写应该首先到工程目录下去找，因为你工程目录下没有这个文件夹，所以就找不到了。
你把它改成：./WEB-INF/logs/snoop试试
