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[1.17.1] Issue with Dependencies when Running Client

Posted September 23, 20214 yr

In my mod, I need to use some libraries (GeckoLib), which I have not done before. So, I decided to just follow the API developer's instructions. Now I can successfully build my mod with the library connected and I see the library classes in my IDE.
The problem is that I cannot start the game client to test my mod. The client gives me the error "NoSuchMethodError". As far as I understand, this should be related to mappings (I use the official ones).
If anyone knows what I am doing wrong, please explain to me.

This is my 'build.gradle':

Spoiler

buildscript {
    repositories {
        // These repositories are only for Gradle plugins, put any other repositories in the repository block further below
        maven { url = 'https://maven.minecraftforge.net' }
        maven { url = 'https://repo.spongepowered.org/maven' }
        mavenCentral()
    }
    dependencies {
        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '5.1.+', changing: true
        classpath 'org.spongepowered:mixingradle:0.7-SNAPSHOT'

    }
}
apply plugin: 'net.minecraftforge.gradle'
apply plugin: 'org.spongepowered.mixin'
apply plugin: 'eclipse'
apply plugin: 'maven-publish'

version = '1.0'
group = "techeart.${modid}"
archivesBaseName = "${modid}"

java.toolchain.languageVersion = JavaLanguageVersion.of(16)

println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + '(' + System.getProperty('java.vendor') + ') Arch: ' + System.getProperty('os.arch'))
minecraft {

    mappings channel: 'official', version: '1.17.1'
    
    runs {
        client {
            workingDirectory project.file('run')

            property 'forge.logging.markers', 'REGISTRIES'
            
            property 'forge.logging.console.level', 'debug'

            arg "-mixin.config=tha.mixin.json"

            mods {
                tha {
                    source sourceSets.main
                }
            }
        }

        server {
            workingDirectory project.file('run')
            
            property 'forge.logging.markers', 'REGISTRIES'

            property 'forge.logging.console.level', 'debug'

            mods {
                tha {
                    source sourceSets.main
                }
            }
        }

        data {
            workingDirectory project.file('run')
            
            property 'forge.logging.markers', 'REGISTRIES'

            property 'forge.logging.console.level', 'debug'

            args '--mod', "${modid}", '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')

            mods {
                tha {
                    source sourceSets.main
                }
            }
        }
    }
}

// Include resources generated by data generators.
sourceSets.main.resources { srcDir 'src/generated/resources' }

repositories {
    maven { url 'https://dl.cloudsmith.io/public/geckolib3/geckolib/maven/' }
}

dependencies {
    minecraft 'net.minecraftforge:forge:1.17.1-37.0.67'

    implementation fg.deobf('software.bernie.geckolib:geckolib-forge-1.17.1:3.0.0')
}

// Example for how to get properties into the manifest for reading at runtime.
jar {
    manifest {
        attributes([
                "Specification-Title"     : "${modid}",
                "Specification-Vendor"    : "Techeart",
                "Specification-Version"   : "1", // We are version 1 of ourselves
                "Implementation-Title"    : project.name,
                "Implementation-Version"  : project.jar.archiveVersion,
                "Implementation-Vendor"   : "Techeart",
                "Implementation-Timestamp": new Date().format("yyyy-MM-dd'T'HH:mm:ssZ"),
                "TweakClass": "org.spongepowered.asm.launch.MixinTweaker",
                "TweakOrder": 0,
                "MixinConfigs": "${modid}.mixin.json"
        ])
    }
}

jar.finalizedBy('reobfJar')

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifact jar
        }
    }
    repositories {
        maven {
            url "file://${project.projectDir}/mcmodsrepo"
        }
    }
}

This is the Crash Report:

Spoiler

---- Minecraft Crash Report ----
// My bad.

Time: 23.09.2021, 18:43
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
	at net.minecraftforge.fmllegacy.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:69) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2375%2381!:?] {re:classloading}
	at net.minecraftforge.fmlclient.ClientModLoader.completeModLoading(ClientModLoader.java:183) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2375%2381!:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.lambda$new$1(Minecraft.java:555) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.Util.ifElse(Util.java:361) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading}
	at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:549) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screens.LoadingOverlay.render(LoadingOverlay.java:135) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.GameRenderer.render(GameRenderer.java:874) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1039) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:659) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:186) ~[forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp.jar%2376!:?] {re:classloading,pl:runtimedistcleaner:A}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?] {}
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
	at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?] {}
	at net.minecraftforge.fml.loading.targets.ForgeClientUserdevLaunchHandler.lambda$launchService$0(ForgeClientUserdevLaunchHandler.java:38) ~[fmlloader-1.17.1-37.0.67.jar%233!:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.0.7.jar%238!:?] {}
	at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:90) [bootstraplauncher-0.1.17.jar:?] {}


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
	at software.bernie.geckolib3.resource.ResourceListener.registerReloadListener(ResourceListener.java:9) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
-- MOD geckolib3 --
Details:
	Caused by 0: java.lang.reflect.InvocationTargetException
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[?:?] {}
		at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
		at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[javafmllanguage-1.17.1-37.0.67.jar%2377!:?] {}
		at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1800) ~[?:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java) ~[?:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1792) ~[?:?] {}
		at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:295) ~[?:?] {}
		at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?] {}
		at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[?:?] {}

	Mod File: geckolib-1.17.1-3.0.2.jar
	Failure message: GeckoLib (geckolib3) has failed to load correctly
		java.lang.reflect.InvocationTargetException: null
	Mod Version: 3.0.2
	Mod Issue URL: https://github.com/bernie-g/geckolib/issues
	Exception message: java.lang.NoSuchMethodError: 'net.minecraft.client.Minecraft net.minecraft.client.Minecraft.m_91087_()'
Stacktrace:
	at software.bernie.geckolib3.resource.ResourceListener.registerReloadListener(ResourceListener.java:9) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
	at net.minecraftforge.fml.DistExecutor.safeRunWhenOn(DistExecutor.java:137) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
	at software.bernie.geckolib3.GeckoLib.initialize(GeckoLib.java:37) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
	at software.bernie.example.GeckoLibMod.<init>(GeckoLibMod.java:24) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[?:?] {}
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[javafmllanguage-1.17.1-37.0.67.jar%2377!:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1800) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1792) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:295) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[?:?] {}


-- MOD examplemod --
Details:
	Caused by 0: java.lang.reflect.InvocationTargetException
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
		at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[?:?] {}
		at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
		at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
		at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[javafmllanguage-1.17.1-37.0.67.jar%2377!:?] {}
		at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1800) ~[?:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java) ~[?:?] {}
		at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1792) ~[?:?] {}
		at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:295) ~[?:?] {}
		at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?] {}
		at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?] {}
		at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[?:?] {}

	Mod File: main
	Failure message: NoName (examplemod) has failed to load correctly
		java.lang.reflect.InvocationTargetException: null
	Mod Version: 0.0NONE
	Mod Issue URL: NOT PROVIDED
	Exception message: java.lang.NoSuchMethodError: 'net.minecraft.client.Minecraft net.minecraft.client.Minecraft.m_91087_()'
Stacktrace:
	at software.bernie.geckolib3.resource.ResourceListener.registerReloadListener(ResourceListener.java:9) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
	at net.minecraftforge.fml.DistExecutor.safeRunWhenOn(DistExecutor.java:137) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
	at software.bernie.geckolib3.GeckoLib.initialize(GeckoLib.java:37) ~[geckolib-1.17.1-3.0.2.jar%2374!:3.0.2] {re:classloading}
	at techeart.tha.content.MainClass.<init>(MainClass.java:33) ~[%2380!:?] {re:classloading}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[?:?] {}
	at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[?:?] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[?:?] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[javafmllanguage-1.17.1-37.0.67.jar%2377!:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.17.1-37.0.67.jar%2379!:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1800) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1792) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:295) ~[?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[?:?] {}


-- System Details --
Details:
	Minecraft Version: 1.17.1
	Minecraft Version ID: 1.17.1
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 16.0.2, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
	Memory: 422564352 bytes (402 MiB) / 1072693248 bytes (1023 MiB) up to 2130706432 bytes (2032 MiB)
	CPUs: 4
	Processor Vendor: GenuineIntel
	Processor Name: Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz
	Identifier: Intel64 Family 6 Model 158 Stepping 11
	Microarchitecture: Coffee Lake
	Frequency (GHz): 3,60
	Number of physical packages: 1
	Number of physical CPUs: 4
	Number of logical CPUs: 4
	Graphics card #0 name: Radeon RX 580 Series
	Graphics card #0 vendor: Advanced Micro Devices, Inc. (0x1002)
	Graphics card #0 VRAM (MB): 4095,00
	Graphics card #0 deviceId: 0x67df
	Graphics card #0 versionInfo: DriverVersion=27.20.1034.6
	Memory slot #0 capacity (MB): 8192,00
	Memory slot #0 clockSpeed (GHz): 2,40
	Memory slot #0 type: DDR4
	Virtual memory max (MB): 18384,42
	Virtual memory used (MB): 15371,87
	Swap memory total (MB): 10259,15
	Swap memory used (MB): 1237,52
	JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	ModLauncher: 9.0.7+91+master.8569cdf
	ModLauncher launch target: forgeclientuserdev
	ModLauncher naming: mcp
	ModLauncher services: 
		 mixin PLUGINSERVICE 
		 eventbus PLUGINSERVICE 
		 object_holder_definalize PLUGINSERVICE 
		 runtime_enum_extender PLUGINSERVICE 
		 capability_inject_definalize PLUGINSERVICE 
		 accesstransformer PLUGINSERVICE 
		 runtimedistcleaner PLUGINSERVICE 
		 mixin TRANSFORMATIONSERVICE 
		 fml TRANSFORMATIONSERVICE 
	FML Language Providers: 
		[email protected]
		javafml@null
	Mod List: 
		forge-1.17.1-37.0.67_mapped_official_1.17.1-recomp|Minecraft                     |minecraft                     |1.17.1              |COMMON_SET|Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
		                                                  |Forge                         |forge                         |37.0.67             |COMMON_SET|Manifest: NOSIGNATURE
		geckolib-1.17.1-3.0.2.jar                         |GeckoLib                      |geckolib3                     |3.0.2               |ERROR     |Manifest: NOSIGNATURE
		main                                              |NoName                        |examplemod                    |0.0NONE             |ERROR     |Manifest: NOSIGNATURE
	Crash Report UUID: bfb35e3d-d977-40b6-96dd-ad7f6f6e6073
	FML: 37.0
	Forge: net.minecraftforge:37.0.67

Quote

September 25, 20214 yr

Author

I tried to update the forge and the library used, and then completely rebuilt the project. I'm still not sure what exactly the problem was, but it has now been resolved.

Quote

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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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