Spring+SpringMVC+MyBatis+Maven项目中，log4j报错

Apache Maven Spring LOG4J MyBatis

log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by 
log4j:ERROR [java.net.URLClassLoader@6a6824be] whereas object of type 
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [ParallelWebappClassLoader
  context: j2eeHW0602_war_exploded
  delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@6a6824be
].
log4j: ERROR Could not instantiate appender named "stdout".

log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n