Data in J2ME RecordStore does not persist across sessions

Question

I\'m building a mobile app with J2ME, and I\'ve found that the data I write into a RecordStore can be accessed while the program is still running but it is lost after quitti

Answer 1

This question has been around for a while but I stumbled upon it whilst looking for an answer to the same problem with the emulator but in my case it was when using the Java ME 3 SDK. It is possible that the solution I found might also fix this problem.

Using:

emulator -Xdescriptor:/path/to/app.jad

will according to the docs: "Install a MIDlet, run it, and uninstall it after it finishes."

To persist an installation (and it's data) you should use:

emulator -Xjam:install=

The JAD file URL can either be a web address or 'file:///path/to/app.jad' if you want to install from your local file system. This installation command will display an application storage number which you can then use to launch the emulator and run the previously installed app by calling:

emulator -Xjam:run=

See the docs for further command line options.