public class ModEffects {
    private ModEffects() {
    }

    static void register() {
        Effects.register();
      	//at reasure.reasurecraft.init.ModEffects.register(ModEffects.java:23) ~[?:?] {re:classloading}
        Potions.register();
    }

    public static class Effects {
        public static final RegistryObject<Effect> EXPLOSIVE = register("explosive", ExplosiveEffect::new);

        private Effects() {
        }

        static void register() {
        }

        private static <T extends Effect> RegistryObject<T> register(String name, Supplier<T> effect) {
            return Registration.EFFECTS.register(name, effect);
        }
    }

    public static class Potions {
        //at reasure.reasurecraft.init.ModEffects$Potions.<clinit>(ModEffects.java:47) ~[?:?] {re:classloading}
        public static final RegistryObject<Potion> EXPLOSIVE = register("explosive", new EffectInstance(Effects.EXPLOSIVE.get(), 1200, 0));
        public static final RegistryObject<Potion> LONG_EXPLOSIVE = register("long_explosive", new EffectInstance(Effects.EXPLOSIVE.get(), 2400, 0));
        public static final RegistryObject<Potion> STRONG_EXPLOSIVE = register("strong_explosive", new EffectInstance(Effects.EXPLOSIVE.get(), 600, 2));


        private Potions() {
        }

        static void register() {
        }

        private static RegistryObject<Potion> register(String name, EffectInstance potion) {
            return Registration.POTIONS.register(name, () -> new Potion(potion));
        }
    }
}

[21:48:59] [modloading-worker-6/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to create mod instance. ModID: reasurecraft, class reasure.reasurecraft.ReasureCraft
java.lang.ExceptionInInitializerError: null
	at reasure.reasurecraft.init.ModEffects.register(ModEffects.java:23) ~[?:?] {re:classloading}
	at reasure.reasurecraft.init.Registration.register(Registration.java:47) ~[?:?] {re:classloading}
	at reasure.reasurecraft.ReasureCraft.<init>(ReasureCraft.java:32) ~[?:?] {re:classloading}
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_281] {}
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_281] {}
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_281] {}
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_281] {}
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_281] {}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:81) ~[forge:36.2] {re:classloading}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) [?:1.8.0_281] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) [?:1.8.0_281] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_281] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1067) [?:1.8.0_281] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1703) [?:1.8.0_281] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:172) [?:1.8.0_281] {}
Caused by: java.lang.NullPointerException: Registry Object not present: reasurecraft:explosive
	at java.util.Objects.requireNonNull(Objects.java:290) ~[?:1.8.0_281] {}
	at net.minecraftforge.fml.RegistryObject.get(RegistryObject.java:120) ~[forge:?] {re:classloading}
	at reasure.reasurecraft.init.ModEffects$Potions.<clinit>(ModEffects.java:47) ~[?:?] {re:classloading}
	... 16 more
[21:48:59] [main/FATAL] [ne.mi.fm.ModLoader/LOADING]: Failed to complete lifecycle event CONSTRUCT, 1 errors found
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:39)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at cpw.mods.modlauncher.Launcher.run(Launcher.java:82)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at cpw.mods.modlauncher.Launcher.main(Launcher.java:66)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1052]: 	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:108)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by: java.lang.reflect.InvocationTargetException
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at java.lang.reflect.Method.invoke(Method.java:498)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at net.minecraftforge.userdev.FMLUserdevDataLaunchProvider.lambda$launchService$0(FMLUserdevDataLaunchProvider.java:51)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.ThreadGroup:uncaughtException:1061]: 	... 5 more
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: Caused by: net.minecraftforge.fml.LoadingFailedException: Loading errors encountered: [
	fml.modloading.failedtoloadmod
]
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	at net.minecraftforge.fml.ModLoader.waitForTransition(ModLoader.java:269)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	at net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:236)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:194)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	at net.minecraftforge.fml.DatagenModLoader.begin(DatagenModLoader.java:60)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	at net.minecraft.data.Main.main(Main.java:45)
[21:48:59] [main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: 	... 11 more
Exception in thread "main" 
Process finished with exit code 1

It has error

Edited September 12, 20214 yr by reasure

public class ModEffects {
    public static final DeferredRegister<Effect> EFFECTS = DeferredRegister.create(ForgeRegistries.POTIONS, ReasureCraft.MOD_ID);
    public static final DeferredRegister<Potion> POTIONS = DeferredRegister.create(ForgeRegistries.POTION_TYPES, ReasureCraft.MOD_ID);

    public static final RegistryObject<Effect> EXPLOSIVE_EFFECT = EFFECTS.register("explosive", ExplosiveEffect::new);

    public static final RegistryObject<Potion> EXPLOSIVE_POTION = register("explosive", new EffectInstance(EXPLOSIVE_EFFECT.get(), 1200, 0));
    public static final RegistryObject<Potion> LONG_EXPLOSIVE_POTION = register("long_explosive", new EffectInstance(EXPLOSIVE_EFFECT.get(), 2400, 0));
    public static final RegistryObject<Potion> STRONG_EXPLOSIVEPOTION = register("strong_explosive", new EffectInstance(EXPLOSIVE_EFFECT.get(), 600, 2));

    private static RegistryObject<Potion> register(String name, EffectInstance potion) {
        return POTIONS.register(name, () -> new Potion(potion));
    }
}

It has same error

public static final RegistryObject<Potion> EXPLOSIVE_POTION = POTIONS.register("explosive", () ->
            new Potion(new EffectInstance(EXPLOSIVE_EFFECT.get(), 1200, 0)));
    public static final RegistryObject<Potion> LONG_EXPLOSIVE_POTION = POTIONS.register("long_explosive", () ->
            new Potion(new EffectInstance(EXPLOSIVE_EFFECT.get(), 2400, 0)));
    public static final RegistryObject<Potion> STRONG_EXPLOSIVEPOTION = POTIONS.register("strong_explosive", () ->
            new Potion(new EffectInstance(EXPLOSIVE_EFFECT.get(), 600, 2)));

It worked! Thank you!