Question

What are the other mutually exclusive permissions for a MIDlet aside from “Net Access” and “Auto Invocation”? Are “Net Access” and “Messaging” not mutually exclusive?

Edit: What about “Messaging” and “Auto Invocation”?

Answer 1

Stuff like you ask about is covered in MIDP specification addendum: The Recommended Security Policy for GSM/UMTS Compliant Devices. In particular, it explains mutually exclusive permissions as follows:

…the Blanket setting for Application Auto Invocation and the Blanket setting for Net Access are mutually exclusive. This constraint is to prevent a MIDlet suite from auto-invoking itself, then accessing a chargeable network without the user being aware.

Above document is quite lengthy and complicated. For an easier to understand (though less precise) explanation, consider studying the tutorial article Understanding MIDP 2.0’s Security Architecture:

This article describes other MIDP 2.0 features that protect users and their devices from malicious software. You’ll… learn how to work with MIDP 2.0’s security architecture…