JNLP download to check for file version differences

When the end user of my application clicks on JNLP link, I want to show him a popup " Files have changes, Please clear your cache" in case there is a new deployment. Can some body tell me what exactly to be done ? Do I need to deal with any config parameters or I have to create some additional programs. If so, how that program file will get into action as soon as somebody clicks on jnlp link.
-Regards;
SS

Hi Alex,
Thanks for your response.
Yes, I am talking about the files that are mentioned in .jnlp file of Web Start. I understand that if the files change, Web Start will automatically update the client cache. But if the new deployment jars are signed with a different certificate then it cant download at client, it will throw an error to the end user - 'Jars are not signed with the same certificate', unless the client cache is manually cleared. Hence when there is a difference in certificate level, and hence change in jars, I wish to present the end user with a information message that 'Jars have changed, please clear your cache'.
I hope I am able to explain this time. Please let me know if I need to explain my requirement any further.

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You could try using the File.exists() method.
The paths are on networked drives, does that make a difference?Try the above on a local file and a networked file.
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Last edited by drrossum (2012-01-18 21:58:28)

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