BlackBerry code signing warning

Question

I use following line of code in my blackberry java application (6.0)

private static final int HPADDING = Display.getWidth() <= 320 ? 6 : 8;

but Eclipse gives me a warning saying That :

Signing Required: RIM Runtime API (0x52525400): Protected Class     
net.rim.device.api.system.Display

The application installed on the device but it doesn't run. So I want to know that Is there any method to do this without signing the application. I'm very much new to blackberry please help me.

Thank you!

Answer 1

If your code contains a reference to Signed API then you have to sign your application before installing it on actual device. Unsigned application that uses Signed API can run on a simulator but won't launch on an actual device.

Apply for signing keys here: http://www.blackberry.com/go/codesigning

You will receive an email with attached signing keys. Follow the instructions in the received email to install these keys and use them to sign your application.