Someone could tell me how Forge works with mod jar?

[Blu3Fat]

Recently I am trying to add some resource into a jar through java. By that I could insert some extern resource like songs when I launch the game. And then I learned about how to insert something into a jar through java. But it seems like we could just "override" a jar but not "insert". That's to say,we have to copy and paste whole jar file then add our files into it. And everytime we do it,we just create a new jar(although it could be totally containing the same content).

And then,I tried to set the insert stage to mod initalization phase. And first time I launch the game,It failed because the ClassnotDefExcetion,I guess that's because some .class files were overrided while running. But after this crash,every launching succeed and I just rerun it. So why it will always crash with ClassnotDefException at the first time but work peacefully after that and the mod just do what it did last time!!

[loordgek]

what are you trying to add

[Blu3Fat]

10 hours ago, loordgek said:

what are you trying to add

For example some .ogg music file.I wanna make it customizable to add players' own playlist.

[ChampionAsh5357]

Make a resource pack? Or make a mod. Don't try to modify an existing jar.

[Blu3Fat]

On 12/2/2022 at 10:19 PM, ChampionAsh5357 said:

Make a resource pack? Or make a mod. Don't try to modify an existing jar.

yep,what I meaned is I want to modify my mod jar itself while running.But that's truly kind of dangerous,maybe I would turn to modify the resource pack instead.

[loordgek]

no you make a new resource pack

[Kumar]

Minecraft by default does not run mods so you need to use a mod loader, Forge. There are multiple different ways you can add mods whether you are just installing Forge and the mods manually to Minecraft or if you are using a launcher such as the Twitch Desktop App.

 

 

 

 

 

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Edited May 3, 2023 by Kumar