"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?

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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.

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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).

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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