If you specifically want to run JAR files (not an Android device), you have two options:
MRE (MediaTek Runtime Environment) is a lightweight application platform designed specifically for feature phones with proprietary OS setups. Unlike .jar files, .vxp files do not require a heavy virtual machine; instead, they act as direct native executables for the chipset. Convert .jar To .vxp UPD
Converting .jar to .vxp UPD can seem daunting, but with the right tools and techniques, it's a manageable process. Whether you choose to use a conversion tool, manual conversion, or a script/program, this guide has provided you with a comprehensive overview of the conversion process. If you specifically want to run JAR files
The application requires more RAM than your device possesses. Try re-converting the file and lowering the heap memory configuration, or choose a smaller, lighter .jar file. Whether you choose to use a conversion tool,
Do not try to convert blindly. First, extract the JAR: