Ugdhar

You do not need to put the vanilla walls in it, making sure replace is false includes the minecraft walls. Also, did you look at your logs and see this: (*edit: I assume you got this in your log as well, since I just cloned your project and ran it, and this was present in the log afterwards)

Looks like your blockstate json is invalid for some reason. Maybe check out data generators: https://wiki.mcjty.eu/modding/index.php?title=Tut14_Ep7

post it as a github gist, if you don't have a github, make one, it's free, and awesome.

Please post your debug.log, there is likely an error in there that will give us a lead about why it's mad.

Use DeferredWorkQueue.runLater(Runnable), DeferredWorkQueue is in the net.minecraftforge.fml package and is documented. There was an example of someone using it within the first page of search results. If something doesn't work, you need to post updated code (preferably just have a github repo for the project) and updated logs, and be more descriptive than "it didn't work". When all the details are present, a solution usually presents itself

Search these forums with the search bar at the top for DeferredWorkQueue and you will find an example in one of the results I am sure. I haven't looked, but there might also be documentation in the source for it as well.

Haha oops, I meant that instead of DeferredRegister, thanks, fixing it!

You are overthinking it. You don't need to extend DefaultBiomeFeatures, just find one of the method calls in there that is adding ores, such as this from the addOres method: biomeIn.addFeature(GenerationStage.Decoration.UNDERGROUND_ORES, Feature.ORE.withConfiguration(new OreFeatureConfig(OreFeatureConfig.FillerBlockType.NATURAL_STONE, IRON_ORE, 9)).withPlacement(Placement.COUNT_RANGE.configure(new CountRangeConfig(20, 0, 0, 64)))); And then use a similar call to the Biome#addFeature method from your FMLCommonSetupEvent, using DeferredWorkQueue using your custom ore. *edit: also, that event you have setup will never fire, there's no method signature to indicate what event it is subscribed to

Were you in creative mode when you were trying it? Just curious, since I would imagine you wouldn't take damage in creative.

I've seen people using a mod called optiforge to load unsupported versions of optifine in 1.15, but honestly that seems like a total hack to me, and I wouldn't bother. Just seems like a hacky mod that lets you run an unsupported hacky mod. . .

Please post your debug.log after this happens with no mods installed, it should provide enough information to start figuring out what is going on.

Please do not add on to a thread someone else started just because you think your issue is the same, changes are it is not. You should start your own thread. No you don't, the latest version is 1.15.2-31.2.0 and you are still using 1.12, which is no longer supported due to age. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

If you look in the Referenced Libraries of your IDE, there is a forge jar with all the MC/Forge sources for you to browse. A lot/most of the forge stuff has comments/javadocs, but as far as I can tell the majority of the vanilla stuff is not. If you mean like an actual reference manual describing all the methods, there is not one, you more or less have to dig in and read the code. As for your other question, I haven't tried to find all instances of a specific item entity before, sorry!

Really old versions are no longer supported. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

As Terdy mentioned above, you make a new Installation (they aren't called profiles anymore) in your launcher for whatever version(s) you want. That being said, keep in mind that 1.12 is not supported here any longer, and if you have issues, you will have to go elsewhere for support. Moderators will close threads for old versions, since the focus is on modern MC/Forge.

Really old versions are no longer supported. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

I'm pretty sure he's a mod user, not a mod maker, and doesn't really know what he's saying.

Whichever program is opening the files as ZIP files has hijacked your jar file associate away from Java. https://johann.loefflmann.net/en/software/jarfix/index.html should sort you out.

You got scammed, there is no Pixelmon for 1.15.2, it has not been updated to a supported versions yet (which doesn't mean you can't try to use it, you just won't get help for it here) *edit: Pixelmon website https://reforged.gg/

Really old versions of Minecraft/Forge are no longer supported. Please update to a modern (1.14.4/1.15.2) version to receive support. More information on supported versions can be found in the LTS link at the top of every page.

You probably aren't getting answers (I saw you complaining in another thread), 1)because you didn't wait very long, this is a forum not a chat room; and 2) because 1.12 is no longer supported because it is out of date. Please update to a modern version (1.14.4/1.15.2) to receive support. If you cannot/will not update, you will have to seek support elsewhere for your issue. More information on supported versions can be found in the LTS link at the top of every page.

you are starting a vanilla server. Use the forge jar

How are you starting the server? If it's a script, please post the contents of it.

Not much I can do to help you if you're using old software then, sorry! Good luck!!

Everything looks right to me, compared it to a block drop json I have that I know works, seems like everything's right, it looks in the right folder and everything. Just to throw this out there, you aren't in creative mode, are you? Things don't drop in creative mode