How to tell the Debugger to jump to replaced code?

[tender holly]

Context

I'm using Intellij IDEA CE and I'm modding a game, The game loads *.jar files (mods) into its classpath. By naming a class in your mod the same as a game source class, you can overwrite it. This way it's possible to replace vanilla game code. I guess Minecraft does something similar. I'm using a special DEBUG.run.xml config to run the game in debug mode. There I'm providing my mod *.jar files and some the game needs to function.

Problem

When debugging my replaced code by placing a break point in it, the debugger will jump to the original vanilla game source code instead of my replaced one.
I can see variables in the debugger, which are only present in my replaced code. The IDE just sends me to the wrong place.

Is there a way to tell the debugger my source is the truth?

[celest pine]

<@&987246527741304832> please have a look, thanks.

[candid tartan]

try excluding that vanilla class from classpath

somehow

[tender holly]

AFAIK I can only exclude whole .jar files from the classpath 🤔

[jolly marsh]

You can remove old class from the jar and add new one

[tender holly]

I can not change the games source code directly, if that's what you mean by removing the old class

[jolly marsh]

Then, you can use the "evaluate" in the debugger and put some code there if it is a temporary solution. (for example in intellij)
But not clear how changed code was added to the game. Was is loaded by game?
If yes then how was it configured?

[tender holly]

yes it is loaded by the games classloader;

it is hardcoded as far as I know

there is no configuration for it

evaluation works somehow... but going step by step through the code is not possible with this ^^