JRE jar caching - is there any trick to ignore IP address?

Hello,
I'm a developer of GUI solutions for TV and Radio transmitter networks. In a current project TV-Stations are accessible via Web Browser with (relatively large) applets embedded in HTML pages. We are using JRE Plugin V6.x, the applets are the kernel element at the client side. The solution works fine - the only (but big) problem is the loading time of the jar libs used by the applets. There is one lib with appr. 1.5 MBytes and the end-customers, e.g. the DVB/ATSC-Service-Providers have in some cases only slow modem connections to the Tx-Stations (may be anywhere on a big mountain..) with 9 kbit/sec transfer rate.
Our Rich-Client-Solution ist optimized for small network bandwidths and works normally down to appr. 3 kbit/sec. The only problem is: the big jar-lib must be loaded before any communication may start. Of cause we strictly recommend our customers to enable caching - as it is by default - in SUN JRE plugin. But this helps not in each cases, because JRE caches each jar and other resources with the IP-address from where it have been loaded. It's prob. necessary for Java-included security, but bad for our applications.
Imagine a typical scene: An ATSC-TV-provider "GoodLuckBObama.tv" ;) has 150 TX/antenna stations around the United States. Each station has a unique IP (normally also not within the same sub net). When "GoodLuckBObama.tv" byes the 150 transmitters from us there is the current firmware release installed - e.g. 3.6.7 Now the provider wants to access all the stations remote via Web Browser from one central office - may be in NY. He logs on to IP 123.89.78.3 in Miami - there is an ADSL connection with 8 Mbit/sec - the web UI opens and works immediately. Happy about this he wants to have a look at a station in the Rocky Mountains with IP 33.44.55.66 - there is a Modem connection of 64 kbit only. He waits 5 and more minutes - he closes the Browser, starts again.. - it seems so as there is a bug in the Rocky Mountain's stations firmware - he calls our support for help and it's told him: "..we're very sorry, but you must have a connection above 1 Mbit to use the Web UI, beyond there is only SNMP.." Or you must wait more than 1 hour to install the client-software on your PC.. And thats only why JRE-Plugin loads the same jar (eg. rstxui-browsercli-jar-3-6-7.jar) again because it's assumed as an unknown new jar - not already cached. And.. - imagine furthermore that "GoodLuckBObama.tv" decided: ok, we're waiting 1 hour for our 20 stations docked on via modem. After this there's everything all right ...until the 1st software update in 2 months - the same desaster starts again... and the customer asks himself - WHY??
I red with interest article "Applet Caching" in the JRE-Plugin developer guide - bit I didn't find a solution for the describe problem above.
What we want is: if there is a jar with the same name, size, version.. already in cache, we won't that the plugin loads the same again - from any IP. Is there any way to get this behaviour? Can we sign up the jar-libs in any manner to make sure that "it's 100% the same - ignore location/IP"? Or - if nothing other helps - is it possible to modify the (now Open Source) src code of the J-Plugin to force the necessary functionality in a "legal way" without any problems with the underlying license conditions?
I hope anybody can help me..
Thanks

Hi
Deploying all .jars (except the applet .jar file) as standard extensions could help.
[http://java.sun.com/j2se/1.5.0/docs/guide/plugin/developer_guide/extensions.html]
I didn't test this myself but according to the doc, Java plugin evaluates the Extension-Name, Specification-Version, Implementation-Version and Implementation-Vendor-ID of an extension requested by an applet.
If there is an installed extension that matches these criteria, Java Plugin will use it, otherwise the extension will be installed as specified in the applets MANIFEST file.

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