log4j log4j:WARN No appenders could be found for logger
2014-06-11 14:31
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web项目用log4j配置文件，结果死活不生效，仔细检查配置文件没有问题，结果一直报
log4j:WARN No appenders could be found for logger
火大，于是把源代码拿下来debug，一步步执行，最后终于找到了元凶，泪流满面
原因：log4j的配置文件是带BOM的UTF-8格式，文件最开头有BOM的3字节EF BB BF，
导致log4j.rootLogger 变成了 xxxlog4j.rootLogger （xxx不可见）
log4j初始化的时候用rootLogger这个key去配置文件里面寻找，没能找到(因为变成了 xxxlog4j.rootLogger)，就没有初始化rootLogger了。
去掉BOM，立刻ok了。
log4j:WARN No appenders could be found for logger
火大，于是把源代码拿下来debug，一步步执行，最后终于找到了元凶，泪流满面
原因：log4j的配置文件是带BOM的UTF-8格式，文件最开头有BOM的3字节EF BB BF，
导致log4j.rootLogger 变成了 xxxlog4j.rootLogger （xxx不可见）
log4j初始化的时候用rootLogger这个key去配置文件里面寻找，没能找到(因为变成了 xxxlog4j.rootLogger)，就没有初始化rootLogger了。
去掉BOM，立刻ok了。
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