I am new to JSP and struggling with this issue. I created a Hello World page and worked fine. After I made some changes, I uploaded the new version of my index file several times. I have even deleted my index.jsp file from the server, along with the WEB-INF and META-INF folders. I've done this several times, even at shell level, yet when I visit the .JSP file in my browser, it's the same file. It will not update. In NetBeans IDE, I have built and ran my project and it works correctly, displaying the correct file. I've even opened the file in a simple editor first before uploading to make sure the build file was the new updated file and it is. So why after I upload it, does the same page exist? How is that possible?

I've cleared my browser cache, deleted history, everything I know to do. This is not behaving like any other programming language I've used before.

You need to restart the webserver i think (i had a similar problem but using IIS and ASP.NET and this solved it)

Correct me if I'm wrong, but doesn't that seem like a pretty serious action to do when uploading a new version of a file. I can stop and restart services for the server, but that does not fix the issue. Restarting the server is pretty much out of the question. Although I'm still developing, the main server is the same as the development. It would cause too many problems having to restart everytime I upload an updated file. Is there anything else that can be done?

Why when I delete the file I get a 404? Should it require a restart before that as well?

In work folder of your application/web server installation search for the Java and Class files generated earlier for your old JSP, try removing them. Put the modified JSP file in place, clean up your browser cache once again and try accessing the page.
Let me know if it helped.

Just For your reference, generated classes are generally kept at following places in two of the servers I have used:

1. Tomcat - C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\shop\org\apache\jsp\JSP
2. JBoss - D:\jboss-4.0.4.GA\server\default\work\jboss.web\localhost\shop\org\apache\jsp

You should never mess up with Catalina directory on life server or you may pay dearly. Same apply to your local pc instalation...

Well I thought its not going to effect server settings. Would removing JSP generated classes, which again will get generated upon page access be so dangerous?

The only files I've uploaded to the server are the WEB-INF folder, META-INF folder, and index.jsp.
Inside the WEB-INF folder is:
/classes/ (empty)
/lib/
/lib/jstl.jar
/lib/standard.jar
web.xml

Inside the META-INF folder is:
context.xml
MANIFEST.MF

I have tried deleting all of these from the server and uploading them back. This doesn't seem to affect it, it still loads the old page.

Can you just rename old class and java files, for security sake, and try what I suggested in previous post. Am still pretty sure that even deleting those won't hurt your setup, but since Peter has raised a concern lets keep it in mind, and instead of deleting lets rename them, so that we can revert it back if something goes wrong.

I never run online Tomcat server just local installed plus the project on university server, but my teacher told me always to stop server throught Tomcat manager, do any changes you need, then Start server and do Reload. However this was only school project, I have no idea what you running and don't know what will happens if you try to do so...

The changes I suggested are not at all related to any server configuration changes. Since the java/class files get generated upon page access, if not found in work fold I don't think deleting them would be such a big deal.

Now, for restarting servers, I have 'n' number of experiences with some major companies in this world, that they generally don't allow server restarts without a planned maintenance. And for things like minor changes in JSP, I don't think restart is a good idea, though it will surely solve the issue, but I think the work around I suggested will probably resolve the matter.

So, now am just asking to follow the thumb rule of maintaining any live project on client's server - Don't delete anything, keep a backup, if something weird is witnessed, revert back your changes.

What say??