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java.lang.NoClassDefFoundError: net/minecraft/block/Block

Posted December 18, 201212 yr

Good day,

i only just started modding for minecraft the other day using the tutorials on the wiki. It worked perfectly fine until i tried to add a new block. While it still worked with the minecraft version emulated by eclipse my "ordinary" minecraft gives me the above error message. I used the "import net.minecraft.block.Block;" line just as in the tutorial, i assume otherwise the eclipse-minecraft would have had some error of its own. So now my question is: Does anyone have any idea why this might be happening? I myself am clueless for now, and using the search function did not really help me. Please inform me if additional information are required though i didn't see a sticky about a specific form for requests in this sub-forum.

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December 18, 201212 yr

Good day,

i only just started modding for minecraft the other day using the tutorials on the wiki. It worked perfectly fine until i tried to add a new block. While it still worked with the minecraft version emulated by eclipse my "ordinary" minecraft gives me the above error message. I used the "import net.minecraft.block.Block;" line just as in the tutorial, i assume otherwise the eclipse-minecraft would have had some error of its own. So now my question is: Does anyone have any idea why this might be happening? I myself am clueless for now, and using the search function did not really help me. Please inform me if additional information are required though i didn't see a sticky about a specific form for requests in this sub-forum.

It's net.minecraft.src.Block. The fact that minecraft worked fine in eclipse makes me think that your mod file is in the same package as minecraft's Block.java file -- which makes me fear that you're putting your mod files directly in net.minecraft.src. That's usually a bad idea, as (iirc) it always means that the compiled version of your mod must be installed directly in minecraft.jar. I recommend looking through wuppy's tutorials on modding post-1.3.1, one of the things they recommend is putting all your mod files in a custom package.

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December 18, 201212 yr

Author

one of the things they recommend is putting all your mod files in a custom package

which i have done already:

Also it is not net.minecraft.src.Block any longer:

You can also look that up in the tutorial:

http://www.minecraftforge.net/wiki/Tutorials/Basic_Blocks

Here it says import net.minecraft.block.Block;

Wuppy's tutorial appears to be older (18th August) than this one (13th December)

Anyhow, thank you for your input, maybe you can think of another possible reason?

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December 19, 201212 yr

um. . . Well then, I'm sorry I said anything. I've never seen net.minecraft.block before, from my experiences forge's decompile.bash always puts minecraft.jar classes in a net.minecraft.src package; are you working with the 1.4.6 prerelease?

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December 19, 201212 yr

He's got #444 or above. You need to run recompile.bat and reobfuscated.bat, then the files for the mod.zip will be in reobf/minecraft

Protip: try and find answers yourself before asking on the forum.

It's pretty likely that there is an answer.

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December 19, 201212 yr

Author

I'd like to thank both of you for your help.

keepcalm, you are my hero of the day, using the .bat files worked and i can now add blocks to my liking.

Honestly, this was driving me insane.

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[SOLVED] Guys, please help me get through this horrible NoClassDefFound exception.

Well, needing help for this didn't last nearly as long as I expected, lol. I figured out the solution, and it's a real face palmer. Basically, the function Type.getInternalName(Class<?> clazz) does NOT work for classes that are obfuscated. This means that it won't work for basically every minecraft class. So running it with the argument EntityTrackerEntry.class won't work, but running it with CustomHandler.class will work! Annoying, but a still bit interesting. So I just replaced my call for Type.getInternalName(EntityTrackerEntry.class) with just "os", as that is the name of the actual class for EntityTrackerEntry at runtime. Hope this solution helps somebody. In the meantime, I'm going to mark this thread as solved.

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By CravenCraft · Monday at 07:40 PM1 day
How do you add a mob to spawn around a existing vanilla structure?

Hey dawg!

I think I might be able to help you out with your issue here. I say might because I don't know about 1.16.x or any later version, but I know how to do this kind of thing for 1.12.2 forge. Basically, in the pre-init or init (I don't really remember which one) you just gotta'

Okay, ykw, I just downloaded the 1.14.4 1.20.1 minecraft mdk. I think I actually can help you here. So, the 1.12.2 method actually doesn't work with 1.20.1 minecraft or later. Probably not too far before either. I see two options here for ya':

First, it's important to note that the game stores its spawn data for structures in, well, the Structures class. Here, the game initializes an instance of each Structure class and registers them with the BootstrapContext using its bootstrap function. Each instance of a Structure class is registered with a StructureSettings class as an argument. One of the arguments, the one that you're probably going to be particularly interested in here, would be the spawnOverrides argument. For this argument, the game uses a Map between MOB_CATEGORIES and StructureSpawnOverride. StructureSpawnOverride is essentially the juice of it here. It contains almost everything you would need to control how your custom mob spawns in Pillager Outposts. Now, if you want to change how the Structure class for the pillager outposts is registered with the BootstrapContext in the bootstrap function, you're going to want to change where the function's caller gets the function and replace it with your own custom version of this function. How might you do this? This is where it gets a little tricky. The bootstrap function for the structures class is referenced in VanillaRegistries.BUILDER. However, unfortunately, this field is private and final, so you can't directly change it with reflections, but you can still access it with reflections. Now the VanillaRegistries.BUILDER field is of the type RegistrySetBuilder, which uses a private final field "entires", which is set as a List<RegistrySetBuilder.RegistryStub<?>> type. So here, you could use reflections to access this list field and remove the entry for the structures bootstrap. Then you might be able to create your own structures class and add change the bootstrap function to reflect the changes you wish. Then finally, simply re-add the Structure entry that you made to the list, and you should be completely done! Keep in mind, I haven't actually tested this, so I'm not sure if it would actually work, and even if it did work it's really unorthodox, so I would recommend trying this next idea.

When the game is deciding whether or not to spawn an entity, if the entity is registered with the SpawnPlacements class, is uses the function you specify in the entity class to determine whether or not the entity can spawn in a certain spot. For example, the guardian cannot spawn on a block that is exposed to light from underwater because of this function. So what you could do is make a checkSelfSpawnRules function for your mob and register it with the SpawnPlacements function. Then, you could have your checkSelfSpawnRules function take into account if the block it's trying to spawn on is near a Pillager Outpost. Finally, you can get the coordinates to the chunk of your block and iterate through the ServerLevels in your MinecraftServer class and get their chunk sources and test if the chunk source has the chunk of your block position. If it does, you can then get the StructureManager from the ServerLevel. In there should be some very helpful functions for you to use. Although this is a bit more orthodox, it might be a bit laggy.

It's really up to you which of these options you choose. If you need some additional clarification then please let me know, I would be happy to help you out! Also let me know if any of these options hit your goals for what your looking for here or not. If not then just let me know; I could probably find another method you could try.

By Jackson Perr · Monday at 06:27 PM1 day

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java.lang.NoClassDefFoundError: net/minecraft/block/Block

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[SOLVED] Guys, please help me get through this horrible NoClassDefFound exception.

[1.20.1] Custom Effect Help

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