Ugdhar

I was just letting you know. Once a moderator sees this topic, it will be locked, I just saved them the effort of explaining why.

Try running the installer from the commandline, and see what it outputs.

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That is the #1 worst way to do things ever. I would not trust the security of any server that was running your mod with a mindset like that, unfortunately

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Post logs please, and a link to code, preferably a github repo that can be cloned/build/debugged

You won't be able to connect to Skyfactory 4 using 1.15.2, simple as that.

You should probably learn how to make a basic mod first, because I don't think anyone is going to walk through step-by-step explaining every part of how to do it. Not to mention there are probably multiple ways it could be done. Are these items coming from thin air? Are they produced by something, i.e. a block? I'm not trying to give you a hard time, just letting you know that your question is way too broad, and you will probably have a hard time getting a decent answer without more information, and a start to the code/mod to base it on. And then of course, there's the question of forge <-> bukkit interoperability, which I honestly know nothing about.

I still do not think that changes things. If you're running forge, the debug screen is going to say forge no matter what you do.

Then just run vanilla, you can't run mods using forge and then say it as vanilla, it just does not work that way.

Please don't bump threads after so short amount of time, it is considered rude. Give it at least a day. If someone that knows how to help you sees your thread, they will do so.

Skyfactory 4 is 1.12.2, which is no longer supported on these forums. You will not be able to connect to that server using modern and supported versions of forge. (i.e. using the 1.15.2 version you have, which is supported, will not work with that old version, but downgrading to an old version to try and get on there means you cannot get help here if you have problems.) That does not mean that you CAN'T use it/play on it, just that you will have to look elsewhere for help. More information on supported versions can be found in the LTS link at the top of every page.

Ok, so I guess my next question is have you tried anything yet? Like I mentioned, if you share the code for what you have tried, you will get much better results getting someone to help out. And of course, if you do not know any Java (or similar programming language), then this will be impossible to do.

Have you tried anything yet? And what precisely do you mean when you say "plugin"? You will get better results looking for help if you have actually tried something.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

Why does having it say forge interfere with your "video roleplay"? Why are you trying to do something using forge, and claim that it is vanilla? If you want it to say vanilla, you probably have to run it without forge.

The issue is that a pickaxe doesn't have to be a subclass of PickaxeItem, someone could make a custom pick that is just an Item with pick functionality. So, while you could check for vanilla picks, or your own pick, you wouldn't really have any way of knowing if it was someone else's pick.

I would try installing forge 1.15.2-31.1.30 from files.minecraftforge.net and making a new Installation in the vanilla launcher using that version, then point the installation game directory at the modpack instance folder that twitch installed. The only thing you would have to do is if you updated the pack through the twitch launcher, if it updated the forge version you would have to install/update that manually through the vanilla launcher installation settings.

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No prob, I just opened up net.minecraftforge.event in my IDE, and saw entity.player in there, so looked and saw that event in there just waiting to be used

Ok, you skipped right from clicking on the installer to trying jarfix, what happened when you clicked on the installer?

Not sure if it fits what you need or not (haven't messed with doing any event stuff like this) but there is an AttackEntityEvent that looks promising, and the comments say it is fired when a player attacks an Entity.

Please be more detailed in what you have done and what you are doing. Start with how you setup your workspace please

Where did you download forge from? How exactly did you install it? What launcher are you using? Please provide as many details about what you have done as possible to help narrow it down.

Except, Optifine doesn't work with forge on 1.15.2 right now, regardless of what mod you use. Once it is brought up to forge compatability, I imagine it won't matter which biomes mod you use.