Before we find a converter, we must understand the architecture.
| Problem | Reason | | :--- | :--- | | Signature Error | Your VXP isn't signed. KaiOS 2.5+ requires a paid certificate. | | Blank Screen | The JAR uses advanced Java features (3D, Bluetooth) not supported by the VXP wrapper. | | Slow Performance | J2ME Loader emulates Java inside a VXP. That’s two layers of overhead. | | Key Mapping | Java games expect a numeric keypad (old Nokia). Modern feature phones have keyboards that map incorrectly. | convert jar to vxp link
Honestly, converting JAR to VXP is a headache. Unless you are a developer, you will fail at the code signing step. Before we find a converter, we must understand
Here is a better workflow:
The J2ME Loader app is the VXP. You just feed it the JAR files at runtime. This avoids the conversion nightmare entirely. The J2ME Loader app is the VXP
Search for:
"game_name.vxp" site:mediafire.com
"vxp games collection"
Many classic J2ME games were already converted by enthusiasts.