So I am getting this error while trying to register a seed blockitem for a crop block.

Spoiler

[18:51:15] [modloading-worker-0/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to create mod instance. ModID: bettercrops, class darkorg.bettercrops.BetterCrops
java.lang.reflect.InvocationTargetException: null
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[?:?] {}
	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:67) ~[javafmllanguage-1.18.2-40.1.86.jar%2380!/:?] {}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:106) ~[fmlcore-1.18.2-40.1.86.jar%2383!/:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run$$$capture(CompletableFuture.java:1804) [?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java) [?:?] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) [?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:373) [?:?] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java) [?:?] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) [?:?] {}
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) [?:?] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) [?:?] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) [?:?] {}
Caused by: java.lang.ExceptionInInitializerError
	at darkorg.bettercrops.BetterCrops.<init>(BetterCrops.java:22) ~[%2384!/:?] {re:classloading}
	... 16 more
Caused by: java.lang.NullPointerException: Registry Object not present: bettercrops:barley
	at java.util.Objects.requireNonNull(Objects.java:334) ~[?:?] {}
	at net.minecraftforge.registries.RegistryObject.get(RegistryObject.java:320) ~[forge-1.18.2-40.1.86_mapped_parchment_2022.11.06-1.18.2-recomp.jar%2378%2385!/:?] {re:classloading,xf:fml:forge:registry_object_binary_compat}
	at darkorg.bettercrops.registry.ModItems.<clinit>(ModItems.java:17) ~[%2384!/:?] {re:classloading}
	at darkorg.bettercrops.BetterCrops.<init>(BetterCrops.java:22) ~[%2384!/:?] {re:classloading}
	... 16 more
[18:51:16] [main/FATAL] [ne.mi.fm.ModLoader/LOADING]: Failed to complete lifecycle event CONSTRUCT, 1 errors found
Exception in thread "main" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:39)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.run(Launcher.java:106)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
	at [email protected]/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149)
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at MC-BOOTSTRAP/[email protected]/net.minecraftforge.fml.loading.targets.ForgeDataUserdevLaunchHandler.lambda$launchService$0(ForgeDataUserdevLaunchHandler.java:27)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
	... 7 more
Caused by: net.minecraftforge.fml.LoadingFailedException: Loading errors encountered: [
	fml.modloading.failedtoloadmod
]
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModLoader.waitForTransition(ModLoader.java:222)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModLoader.lambda$dispatchAndHandleError$21(ModLoader.java:187)
	at java.base/java.util.Optional.ifPresent(Optional.java:178)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:187)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$11(ModLoader.java:164)
	at java.base/java.lang.Iterable.forEach(Iterable.java:75)
	at LAYER PLUGIN/[email protected]/net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:164)
	at TRANSFORMER/[email protected]/net.minecraftforge.data.loading.DatagenModLoader.begin(DatagenModLoader.java:38)
	at TRANSFORMER/[email protected]/net.minecraft.data.Main.main(Main.java:67)
	... 13 more
Disconnected from the target VM, address: '127.0.0.1:54565', transport: 'socket'

Process finished with exit code 1

 

Blocks class:

Spoiler

public class ModBlocks {
    public static final DeferredRegister<Block> BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS, BetterCrops.MOD_ID);

    public static final RegistryObject<Block> BARLEY = registerCrop("barley");

    private static RegistryObject<Block> registerCrop(String pName) {
        return BLOCKS.register(pName, ModCropBlock::new);
    }
}

 

Items class:

Spoiler

public class ModItems {
    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, BetterCrops.MOD_ID);
    
    public static final RegistryObject<Item> BARLEY_SEEDS = registerSeed("barley_seeds", ModBlocks.BARLEY.get());

    private static RegistryObject<Item> registerSeed(String pSeed, Block pCrop) {
        return ITEMS.register(pSeed, () -> new SeedBlockItem(pCrop));
    }
}

 

SeedBlockItem class:

Spoiler

public class SeedBlockItem extends ItemNameBlockItem {
    public SeedBlockItem(Block pBlock) {
        super(pBlock, new Properties().tab(ModCreativeTabs.TAB_SEEDS));
    }
}

 

ModCropBlock class:

Spoiler

public class ModCropBlock extends CropBlock {
    public ModCropBlock() {
        super(BlockBehaviour.Properties.of(Material.PLANT).noCollission().randomTicks().instabreak().sound(SoundType.CROP));
    }

    @Override
    protected @NotNull ItemLike getBaseSeedId() {
        return this.asItem();
    }
}

 

Main class:

Spoiler

@Mod(BetterCrops.MOD_ID)
public class BetterCrops {
    public static final String MOD_ID = "bettercrops";

    IEventBus forgeBus = MinecraftForge.EVENT_BUS;

    IEventBus modBus = FMLJavaModLoadingContext.get().getModEventBus();

    public BetterCrops() {
        ServerConfig.init();
        ModBlocks.BLOCKS.register(modBus);
        ModItems.ITEMS.register(modBus);
        forgeBus.register(this);
    }
}

 

I have registered the block but the supplier.get() doesn't resolve the block for some reason. Any ideas what is wrong?

You are trying to access the unregistered block during classloading (static initialisation).

You need to understand how deferred references work (Suppliers, RegistryObject, etc.) and when you can call get()

This is an important pattern within forge/minecraft.

 

Something like:

 
    // Pass the supplier, don't try to get the unregistered block yet
    public static final RegistryObject<Item> BARLEY_SEEDS = registerSeed("barley_seeds", ModBlocks.BARLEY);

    // Method accepts the supplier
    private static RegistryObject<Item> registerSeed(String pSeed, RegistryObject<Block> pCrop) {
        // Retrieve the block object at registration time
        return ITEMS.register(pSeed, () -> new SeedBlockItem(pCrop.get()));
    }

 

Edited December 3, 20222 yr by warjort