常见错误解决

常见报错解决

Spring 整合Junit4测试：

log4j:WARN No appenders could be found for logger 
	(org.springframework.test.context.junit4.SpringJUnit4ClassRunner).
	log4j:WARN Please initialize the log4j system properly.
	解决办法：在src下建新的file名为log4j.properties
	然后其内如下
	log4j.rootLogger=WARN, 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