Java EE (Java Enterprise Edition) General Discussion

I've built a web application consisting of servlets, jsp and it works fine. Except that the changes that i made recently, when deployed to Tomcat, does not show up. When running with Netbean's bundled Tomcat, it is okay too with no errors. But with Tomcat, the one that is running is actually a previous version.

I've undeployed and deployed the WAR file again using the Tomcat manager, but still it does not work. Then I've performed a search within the forum and found a thread that discusses the issue that changes made are not updated by Tomcat.
http://forum.java.sun.com/thread.jspa?forumID=45&threadID=5156643

Following the suggestion, I've start and stop the tomcat server, and it does not work either.

One of the change that is overlooked is on a CSS file. Could it be that the change that i made, is to a CSS file, and thus is so minor that it is overlooked by Tomcat when it deploys? Can i just manually drag the CSS file into the webapps folder?

Thanks. (Sorry i do not know where to ask this question.)