In-game memory editor

[oak glen]

Pretty much a hex editor in game that allows you to edit Java’s memory in real time

[dusk acorn]

How about no

[frank flume]

I highly doubt

Anyone is going to attempt this

Let alone that it's going to work

Why the hell do you need this

I know what I could work

But it would be tremendous effort

[burnt sorrel]

you don’t even really need a hex editor to do funky stuff with java

just attach a debugger

[crimson harness]

that exist

it's called cheat engine

[lethal swan]

!!hacks

[mental hawk]

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[lethal swan]

even if this request wasn't against the rules or very very sus, live-editing memory is a great way to crash or corrupt stuff. Important stuff like files, apps, java itself, and potentially anything that was running at the same time in the background.

[oak glen]

Corruptions and crashes are fun

This could be for anarchists who want chaos to happen

[oak glen]

It would be confined to the game only

To avoid cheating I have a plan

Make it accessible through /hex and let it only work on singleplayer

[lethal swan]

it would be confined to the cpu and gpu cores running the game that might also be processing other data. Overflowing even a single pointer can cause those cores to read and write things outside of the intended programs and files, even if it's only hex

[oak glen]

What I originally imagined was editing the game’s running code

So things like the world routine, rendering and all of that

Definitely not CPU and GPU memory

[stiff galleon]

you won't be able to access stuff outside as the jvm enforces strict memory bounds and is protected against c/c++ style buffer overflow attacks

[oak glen]

So you can access the game memory itself

But not anything like other java processes

That’s great

[vale coral]

Set up a development environment, launch the game in debugging mode

An in game memory editor though. Like manually entering memory addresses and overwriting the bytes at those addresses?

If you manage to create such a feature, good luck trying to use it

[pulsar aspen]

@oak glen the closest mod you'll probably get is https://modrinth.com/mod/gadget/ which does have some basic memory viewing of certain in-game objects (entities/blocks) (including the ability to edit values). And it lets you see all network traffic too. Client-side only ofc, so relog your game if you mess up anything

Beyond that mod, what you're asking for is basically how to use rather advanced debugging techniques. But it sounds like you might be interested in software like VisualVM (it's a free live java app debugging tool, mostly performance measuring and memory dumping https://visualvm.github.io/) and recaf (a free decompiler https://www.coley.software/Recaf/). That recaf site also has links to learn about how the JVM works, which you'd also probably be interested in

[frank flume]

Isn't a object also randomly assigned?

So no object is after a relaunch in the same memory address?

So no saving those addresses?

I do not know the jvm good enough prob to say anything about dis

[pulsar aspen]

uh, last time I was debugging something in-dev, I noticed some nearby local variables storing objects with sequential id things. But that's probably an implementation detail with different JVMs and/or memory management strategies

oh, and also that was running in debug mode in the first place, which probably also changes (simplifies?) how the jvm behaves... for debugging

[vale coral]

That's what I meant. If you had the ability to arbitrarily edit memory, it's going to be difficult just to find anything.

[frank flume]

Difficult, yes. The only way you could get the address is by in game java shinanigans

To obtain it's adress

Which is also sometimes wronk

So fun having memory corruption

[pulsar aspen]

well uh, there's everyone's favorite: ✨ reflection ✨

[frank flume]

Which more often than not

Gives me wrong addresses

Or I parse it wrong

Either way, it's not cool to work with

[swift plume]

You would want to use Unsafe (haha) to do that

[jagged fjord]

Unsafe is unsafe