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!!

what are you trying to add

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.

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

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.

no you make a new resource pack

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, 20232 yr by Kumar