java.net.ConnectException: fail to connect to localhost/127.0.0.1(port 8080): connect failed:ECONNREFUSED….(Codename One App)

From the emulator, 127.0.0.1 refers to the emulator itself - not your local machine. You need to use ip 10.0.2.2, which is bridged to your local machine.

HTH!

It looks like you're trying to connect to localhost in your URL.

This probably works fine using the simulator, but you'll need to use an IP address or better yet a resolvable host name in your URL when you run the app in production.

Try changing your URL in this way. You can test for connectivity by using your phone's web browser, for example enter a URL (not using localhost!) of your web service in the browser and see what happens.