Question

Is there a way to delete older version of an applet from browser’s cache? The things I have already tried to prevent the cache problem in first place are:

1- To set “no-cache” in HTTP response header, I placed following script on the top of my jsp:

<% 
if (request.getProtocol().compareTo("HTTP/1.0") == 0) {
            response.setHeader("Pragma", "no-cache");
        } else if (request.getProtocol().compareTo("HTTP/1.1") == 0) {
            response.setHeader("Cache-Control", "no-cache");
        }
        response.setDateHeader("Expires", 0);
%>

2- While deploying applet 'cache_option' is set to 'no'

But of no use. I was now wondering if there is a way to programatically delete this applet jar file from cache?

[UPDATE]

Providing a unique url for applet each time doesn’t look like a good idea in my case. As, in my case applet reloads(refresh) itself after a time (say at mid-night, using Timer), hitting on a url

applet.getAppletContext().showDocument(url); 

It would be difficult to communicate new url to applet

Answer 1

The answer you got on your other question also applies here: Provide a unique url for your applet each time. It’s not humor, as lots of people are using this technique and it would solve your problem.