log4j:WARN No appenders could be found for logger

Create a file named log4j.properties
on the directory target/classes/, then copy following content into this file:

log4j.appender.Cons=org.apache.log4j.ConsoleAppender

log4j.appender.Cons.layout=org.apache.log4j.PatternLayout

log4j.appender.Cons.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

# Root logger set to DEBUG using the A2 appender defined above.

log4j.rootLogger=info, Cons 

log4j.additivity=false

#Application Logger+

log4j.logger.com.imooc.mvcdemo=debug, Cons

log4j.logger.org.springframework=debug, Cons

log4j.additivity.com=false

References:

1. http://stackoverflow.com/questions/12532339/no-appenders-could-be-found-for-loggerlog4j