The program can be run in the simulator, but it cannot be run on the real machine after the signature-error error starting

The program can run in the emulator, but it cannot be run on the real machine after the signature-error

Error starting DemoApp: ' DemoApp ' may not contain classes in Com.rim, Net.rim, Net.blackberry, Java or javax packages.

Solution:

Rename the package at the beginning of Com.rim, Net.rim, Net.blackberry, Java or javax in the project DemoApp.

Reference:

http://supportforums.blackberry.com/t5/Java-Development/Signed-code-still-generates-unsigned-error-on-device/m-p/243063

At the moment, your probably don ' t care much about packages, what to did with them or what they. I ' ll just say that for security reasons the JAVA Virtual Machine doesn ' t as it when your classes are in the same package As System classes (Com.rim, Net.rim, Java, etc.).