大家好，又见面了，我是你们的朋友全栈君。
如果用c3p0的话，经常会看到控制台上报一个警告，具体内容不急得了，大意是无法初始化MLog日志，请初始化log4j 出现此种情况是因为使用的c3p0这个连接池，并且没有正确配置其日志，只要把下面这段加到log4j.properties中即可
##################################################################################### #c3p0 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=OFF,A1 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=SEVERE,A1 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=WARNING,A1 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=INFO,A2 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=CONFIG,A2 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=FINE,A2 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=FINER,A2 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=FINEST,A2 log4j.category.com.mchange.v2.log.log4j.Log4jMLog=ALL,A2
#c3p0 appender log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n log4j.appender.A2=org.apache.log4j.RollingFileAppender log4j.appender.A2.File=${sntweb.root}/logs/c3p0.log log4j.appender.A2.MaxFileSize=500KB log4j.appender.A2.MaxBackupIndex=1 #log4j.appender.A2.layout=org.apache.log4j.HTMLLayout log4j.appender.A2.layout=org.apache.log4j.SimpleLayout
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