I just started learning about struts2. I am using apache-tomcat-5.5.28 as server. When I tried to undeploy the application, struts-core-2.0.14.jar file under \webapps\<AppFolder>\WEB-INF\lib folder in tomcat server is not getting deleted. Because of this, every time I make any change to the application, I have to stop server, delete the application folder under webapps manually and then have to deploy it again. I used eclipse for deploying and also I tried with ant script. In both case, the above mentioned jar file is not getting deleted while server is running. Can anyone please help me on this?