Most VXP-based Java emulators do not support internet connectivity. Apps that require a login or server connection will likely fail.
On your phone, go to the File Manager, find the Java.vxp file, and select "Open" or "Run." Convert .jar To .vxp
Before diving into the "how-to," it is important to understand why these files aren't naturally compatible: Most VXP-based Java emulators do not support internet
Converting .JAR to .VXP: A Guide to Legacy Mobile App Porting go to the File Manager