"Invalid Application. Delete?" only when compiled with a Nokia SDK

I'm developing a piece of software for my University and am currently attempting to implement NFC functionality which requires me to move from my standard Sun wireless tool-kit platform (implemented through NetBeans) to a Nokia platform (also implemented through NetBeans).

The problem is, whenever I compile the code with the Nokia platform implementation and run the program, on the Nokia phone I have or in the emulator, the phone displays a box stating "Invalid Application. Delete?" with a yes/no answer. This stops the installation of the application. The strange part is that if I compile the exact same code with the Sun platform implementation it runs without any issues on the Nokia phone. I have tried this with two different Nokia SDKs (the Series 40 Nokia 6212 NFC SDK and the Series 40 5th Edition SDK) with the same resu开发者_运维百科lts.

What is the Nokia SDK doing differently?

There seems to be some kind of discrepancy between a project created using a Sun platform and a project created in a Nokia platform.

Although the original program, initially created with the Sun platform, compiled with the Nokia platform caused the application to be invalid, when I created a new project from scratch using the Nokia platform and just copied the source of the original program over the program worked. There is no discernible difference in the JAD/manifest files between the two.

If you've copied source code, you may have not copied the "manifest.midlets", i.e. tells the OS which "forms" to create. You'll usually find this in the project properties.

(e.g. in NetBeans IDE - Application Descriptor, "Midlets" tab - it shouldn't be empty).

Make sure that the following attributes (key:value pairs) are in the JAD file and also the manifest file in the JAR file:

1. MIDlet-Name
2. MIDlet-Version
3. MIDlet-Vendor
4. MIDlet-Jar-URL
5. MIDlet-Jar-Size