New version not being detected by browser

Hello all.

I'm facing an issue almost everytime I upload a new version of my app
to tomcat.
The browser does not detect that there is a new app ... and the RPC
calls fail.
Then I have to click refresh a few times (or CTRL+F5) ... then the
browser gets the new version.
But end-users dont know that and may quit early...

Is it normal? What should I do during deployment?
Thanks

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