Anyone running Cisco CMS plugin 1.2 on a modern system?

I have a Cisco 3750 that I am trying to use the web interface for. It wants me to download and install a CMS plugin version 1.2 that appears to have been built in 2004. The install of the plugin works, but when I try to run the plugin, I get:

The details: Cisco CMS v1.2 plugin, IE 8, Windows XP/Pro, Java 6 update 16.

Any hints would be appreciated.

Update: I get the same error when trying to run it in Firefox on the same system, so I'm thinking it is a Java issue.

From serverfault David Mackintosh

• Generally with Cisco and their propensity for using Java, try back-revving your installed version of Java to version 4 and try it. If version 4 doesn't work, try version 5. Ugh.

  Farseeker : You should see their internal app called C3. I was (un)lucky enough to be there at its launch, even though it was better than their old app, it's still an absolute horror that likely deserves to be on thedailywtf.com

  Farseeker : (It's a monolithic java app, seeing as how I forgot to say how that was relevant)

  David Mackintosh : Nasty java versioning FTW.
  From GregD