This is where most tutorials lie to you. You cannot convert Java .class files to Bedrock behavior files.
You must analyze the original .jar's source code (using a decompiler like JD-GUI) and manually write JSON behavior components that mimic the logic.
Example: If the Java mod makes a diamond sword set enemies on fire, you edit the sword.json in your behavior pack and add:
"minecraft:on_hurt":
"on_hurt":
"event": "set_on_fire"
You need to write Behavior Pack (logic) and Resource Pack (visuals). Since you have a Java mod, use a converter tool for the boring stuff: how+to+convert+jar+to+mcaddon+verified
Pro Tip: Bedrock uses Molang (a weird math language) instead of Java’s Math.random(). You will cry here. That’s normal.
Once you have recreated the mod in Bridge.:
A verified MCADDON means Minecraft Bedrock recognizes it as safe, signed, and properly formatted. Unverified addons cause the dreaded "Import Failed. This pack is not valid" error. This is where most tutorials lie to you
Java’s block JSON might look like:
"parent": "block/cube_all",
"textures": "all": "mod:block/ruby_block"
Bedrock’s block (in blocks/ruby_block.json):
"format_version": "1.20.30",
"minecraft:block":
"description": "identifier": "converted:ruby_block" ,
"components":
"minecraft:material_instances":
"*": "texture": "ruby_block", "render_method": "opaque"
,
"minecraft:destructible_by_mining": "seconds_to_destroy": 2 ,
"minecraft:destructible_by_explosion": "explosion_resistance": 6
You must manually map each Java property to a Bedrock component. You must analyze the original
Create a new folder on your desktop called MyConvertedAddon. Inside, create exactly these two subfolders:
MyConvertedAddon/
├── behavior_pack/
└── resource_pack/
Let’s walk a real example: converting "More Ores Mod (JAR)" that adds Ruby, Sapphire, and Topaz ores, ingots, and tools.
Step 1: Extract JAR → grab ruby_ore.png, sapphire_ore.png, topaz_ore.png.
Step 2: Write Ore block JSONs for Bedrock (copy-paste from vanilla diamond_ore.json – rename identifiers).
Step 3: Write Ingot items (json in items/ folder with minecraft:max_stack_size: 64).
Step 4: Write Tools (Sword, Pickaxe) using minecraft:durability and minecraft:damage.
Step 5: Write Recipes (ore to ingot in furnace; ingot to tools in crafting table).
Step 6: Assemble behavior and resource packs.
Step 7: Validate with mc-validator.
Step 8: Package as .mcaddon → Test in Bedrock → Success.
Total manual work: ~2 hours for a simple 5-item/3-ore mod.
This is where the manual work happens.