If you get the following warning in your application after adding log4j.jar inside your application. You should need to put log4j.xml and log4j.dtd in your application’s classpath. (putting these files inside a source folder will be also worked, it should be in the classpath)
If you use Netbeans IDE, it is better to create a source folder named log4j for the config files like the one on the following image
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
BUILD SUCCESSFUL (total time: 1 second)