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Use Java 8 for modding.

I discovered with my mod that due to the order of class loading (item registration depending on the ItemGroup from my main class) my initCapabilities method was being called before my capability instance was set, so it was attempting to call null.getDefaultInstance and throwing the error. I resolved the issue by wrapping it in an additional supplier, so the capability was definitely set by the time it was used.

No, it's a bump. You need to render your custom interface in the RenderGameOverlayEvent.Post (So it is displayed in front of anything else on the screen). You also need to make sure you only listen to one of the events (see RenderGameOverlayEvent.ElementType) to prevent rendering it multiple times per frame.

Hello! I'm trying to do my first mod (in 1.15.2) and I've got a little problem... When I try to run Minecraft from Eclipse, it crashes! Here's the log ---- Minecraft Crash Report ---- // I bet Cylons wouldn't have this problem. Time: 26/02/2020 00:17 Description: Initializing game java.lang.ExceptionInInitializerError: null at net.minecraftforge.fml.ModLoader.<init>(ModLoader.java:121) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading} at net.minecraftforge.fml.ModLoader.get(ModLoader.java:146) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading} at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.<init>(Minecraft.java:393) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:141) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?] {} at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {} at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?] {} at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.jar:?] {} at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:102) [forge-1.15.2-31.1.0_mapped_snapshot_20190719-1.14.3-recomp.jar:?] {} Caused by: java.lang.IllegalStateException: Failed to resolve consumer event type: net.minecraftforge.fml.network.simple.SimpleChannel$$Lambda$2252/0x0000000801406840@663cc8c9 at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:194) ~[eventbus-2.0.0-milestone.1-service.jar:?] {} at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:161) ~[eventbus-2.0.0-milestone.1-service.jar:?] {} at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:156) ~[eventbus-2.0.0-milestone.1-service.jar:?] {} at net.minecraftforge.eventbus.EventBus.addListener(EventBus.java:151) ~[eventbus-2.0.0-milestone.1-service.jar:?] {} at net.minecraftforge.fml.network.NetworkInstance.addListener(NetworkInstance.java:65) ~[?:?] {re:classloading} at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:56) ~[?:?] {re:classloading} at net.minecraftforge.fml.network.simple.SimpleChannel.<init>(SimpleChannel.java:49) ~[?:?] {re:classloading} at net.minecraftforge.fml.network.NetworkRegistry$ChannelBuilder.simpleChannel(NetworkRegistry.java:409) ~[?:?] {re:classloading} at net.minecraftforge.fml.network.NetworkInitialization.getHandshakeChannel(NetworkInitialization.java:38) ~[?:?] {re:classloading} at net.minecraftforge.fml.network.FMLNetworkConstants.<clinit>(FMLNetworkConstants.java:48) ~[?:?] {re:classloading} ... 18 more A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Render thread Stacktrace: at net.minecraftforge.fml.ModLoader.<init>(ModLoader.java:121) at net.minecraftforge.fml.ModLoader.get(ModLoader.java:146) at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97) at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) at net.minecraft.client.Minecraft.<init>(Minecraft.java:393) -- Initialization -- Details: Stacktrace: at net.minecraft.client.main.Main.main(Main.java:141) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:567) at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:102) Java Version: 13.0.2, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation Please, Help me ! I'm new and I have no idea what to do to resolve this. package com.leolerenard.foxfantasy; import net.minecraftforge.common.MinecraftForge; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.fml.common.Mod; import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent; import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent; import net.minecraftforge.fml.event.server.FMLServerStartingEvent; import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext; @Mod("foxfantasy") public class FoxFantasy { public FoxFantasy() { FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup); FMLJavaModLoadingContext.get().getModEventBus().addListener(this::doClientStuff); MinecraftForge.EVENT_BUS.register(this); } private void setup(final FMLCommonSetupEvent event) { } private void doClientStuff(final FMLClientSetupEvent event) { } @SubscribeEvent public void onServerStarting(FMLServerStartingEvent event) { } } Here's the .java file

Based off the crash report, it seems like there's something wrong with the listeners for your event bus. I don't know too much about modding in this version though so sorry if I couldn't be more help.

Here's what I did: At that point, I now knew that the particular function I needed had to be "RuleType" type function. So, the next thing I did was decompile a jar that had the java files with deobfuscated names and obfuscated classes... such a file can be found in your MDK folder... MDK_ROOT/build/fg_cache/net/minecraftforge/forge/MCVERSION-FORGEVERSION_at_STRING In my instance: C:\dev\mdk\build\fg_cache\net\minecraftforge\forge\1.15.2-31.1.0_at_b54d5c04b317e9e50ee2e93c270c8b976d4cdb59 Any of the jars in that folder should contain what you're looking for. In my instance, I needed the "create" function in "BooleanValue" in "net.minecraft.world.gamerules" Upon decompiling, you should see the first image... then find your class, just as seen in the second image... next, look in your class for the proper type of function (in my case RuleType), as seen in the third image. The only RuleType function is "func_223567_b". That should be my function, but we can double check by searching for that name in the mappings, either in Excel or even a text editor will do. And if you search for it, the obfuscated name should line up with the deobfuscated name, as seen in the final image. Hopefully this is helpful. ?