attempts to load non-code resources from the server codebase (via applet classloader) not to present the user with any warning prompts.

Understand there may be some difficulty in this if the JVM loses track of the source of InputStreams it decodes byte code from into classes -- though losing track of this has other nasty implications, e.g. that you get warned about mixed resources, but not about unsigned code.

If, on the other hand, the JVM does not lose track of such things, it would seem that loading resources from unsigned jars or the server codebase should not produce warnings.