Converting a Java mod (.jar) into a Bedrock Add-on (.mcaddon) is technically a rebuilding process rather than a simple file conversion, as the two versions of

Manifest.json: Each pack needs a manifest.json file with unique UUIDs to be recognized by Minecraft. Limitations to Consider

  1. JAR2BEDROCK (Python script) – Converts simple item/texture mods. Success rate: 15%.
  2. ModPatcherEX – Automatically rewrites Java class files to JavaScript for Bedrock's GameTest Framework. Success rate: 5% (only for data packs).
  3. Blockbench – The only reliable model converter.
  4. Bridge. Auto-Complete – Not a converter, but essential for manually patching the JSON errors in your .mcaddon.

However, I can explain what’s likely being attempted and the closest real solutions.

  1. Open Blockbench.
  2. Go to File → Convert From → Java Block/Item Model.
  3. Select the Java .json model from the extracted JAR.
  4. Blockbench will attempt a conversion. It usually fails for complex models.
  5. Click File → Export → Export Bedrock Geometry → Save as .geo.json.
  6. Manual Patching: You must manually rewrite the JSON to link the geometry to a Bedrock entity file (.entity.json).

MCAddon: This is a file format used by Minecraft: Bedrock Edition to distribute add-ons, which include custom items, blocks, and more. MCAddons are essentially ZIP files with a specific directory structure.

The "story" of this conversion is one of evolving automation: Zip To MCPack Converter – Apps on Google Play

Grab the assets: Open the extracted folder and navigate to assets/modid/ (where "modid" is the name of the mod). Copy the textures, models, and sounds folders to a new workspace on your computer. 🎨 Step 2: Convert the Assets for Bedrock