If you have old .jar games, play them using a modern J2ME emulator on your PC or Android phone. If you must run apps on a BREW device, look for offline SDKs from the 2000s (purely for educational research) and never trust an "online new converter" with your files.
A proprietary binary format developed by MediaTek (MRE) for low-cost feature phones, such as the Nokia S30+ series (e.g., Nokia 220, 225). Unlike Java, VXP files are typically based on C/C++ and are closer to executable binaries (ELF format). Can You Convert JAR to VXP Online? Technically, no direct online converter exists jar to vxp converter online new