There is a multipart/form-data ContentHandler in the WmJBoss package.
Unfortunately in what in hindsight was a very stupid move, I mixed the startup and shutdown code of the JBoss server with the startup and shutdown of the handler. The idea was this code would move into the core IS, but it has not happened as of yet because no one has been bugging support or, even better, sales about it.
But if one happened to put the classes that ship in WmJBoss/code/classes/wm/mime and WmJBoss/code/classes/wm/mime/resources into their package and they wrote the following two services as their package’s startup and shutdown services, something good could happen, which I cannot guarantee or support. 
import wm.mime.HandlerFactory_Multipart;
startup service contains:
ServerAPI.registerContentHandler(“multipart/form-data”, new HandlerFactory_Multipart());
shutdown service contains:
ServerAPI.removeContentHandler(“multipart/form-data”);
Cheers,
Fred
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