Jump to content

Recommended Posts

Posted

I'm trying to make it so that witches drop a custom item I made. I read that I needed to use global loot modifiers and I am currently looking at the documentation as well as other posts online about how to use them and I can't seem to fully understand what I need to put in my code.

 

This is my what I have in my global_loot_modifiers.json:

{
  "replace": false,
  "entries": [
    "global_loot_test:witch"
  ]
}

 

my witch.json:

{
  "type": "mwh:dust_drop",

  "conditions": 
  [
    {
      "condition": "minecraft:killed_by_player"
    },
    
    {
		"condition": "minecraft:entity_properties",
		"predicate": {
		  "type": "minecraft:witch"
		},
		"entity": "this"
	}
  ],
  
  "item": "mwh:witch_dust"
}

 

and my modifier class:

class VanillaMobModifier extends LootModifier 
{
    private final int numSeedsToConvert;
    private final Item itemToCheck;
    private final Item itemReward;
    
    public VanillaMobModifier(ILootCondition[] conditionsIn, int numSeeds, Item itemCheck, Item reward) 
    {
        super(conditionsIn);
        numSeedsToConvert = numSeeds;
        itemToCheck = itemCheck;
        itemReward = reward;
    }

    @Nonnull
    @Override
    public List<ItemStack> doApply(List<ItemStack> generatedLoot, LootContext context) {
        //
        // Additional conditions can be checked, though as much as possible should be parameterized via JSON data.
        // It is better to write a new ILootCondition implementation than to do things here.
        //
        int numSeeds = 0;
        for(ItemStack stack : generatedLoot) 
        {
            if(stack.getItem() == itemToCheck)
                numSeeds+=stack.getCount();
        }
        if(numSeeds >= numSeedsToConvert) 
        {
            generatedLoot.removeIf(x -> x.getItem() == itemToCheck);
            generatedLoot.add(new ItemStack(itemReward, (numSeeds/numSeedsToConvert)));
            numSeeds = numSeeds%numSeedsToConvert;
            if(numSeeds > 0)
                generatedLoot.add(new ItemStack(itemToCheck, numSeeds));
        }
        return generatedLoot;
    }
    
    @SuppressWarnings("unused")
	private static class Serializer extends GlobalLootModifierSerializer<VanillaMobModifier> 
    {

        @Override
        public VanillaMobModifier read(ResourceLocation name, JsonObject object, ILootCondition[] conditionsIn) {
            int numSeeds = JSONUtils.getInt(object, "numSeeds");
            Item seed = ForgeRegistries.ITEMS.getValue(new ResourceLocation((JSONUtils.getString(object, "seedItem"))));
            Item wheat = ForgeRegistries.ITEMS.getValue(new ResourceLocation(JSONUtils.getString(object, "replacement")));
            return new VanillaMobModifier(conditionsIn, numSeeds, seed, wheat);
        }

    	@Override
    	public JsonObject write(VanillaMobModifier instance)
    	{
    		// TODO Auto-generated method stub
    		return null;
    	}
    }
}

 

I don't know how to modify this part of the code to fit my needs. I only want just witches to have a chance at dropping my item when killed.

 

 

And I saw that I needed to do something like this:

 

@SubscribeEvent
    public static void registerModifierSerializers(@Nonnull final RegistryEvent.Register<GlobalLootModifierSerializer<?>> event) 
    {
        if (ENABLE) 
        {
            event.getRegistry().register(new VanillaMobDropsModifier.Serializer().setRegistryName(new ResourceLocation(MOD_ID,"dust_drop")));
        } 
    }

 

buts it's giving me errors. Pretty sure I'm missing something. I bet I'm probably missing important or obvious but if anyone can point me in the right direction I would very my appreciate it.

Posted
6 hours ago, HeyImAmethyst said:

I don't know how to modify this part of the code to fit my needs. I only want just witches to have a chance at dropping my item when killed.

Under the assumption that your condition is only ever true for witches (I haven't messed with entity predicates, so I am not sure that your condition is actually what you want) the "alter this section" is very easy:

    @Nonnull
    @Override
    public List<ItemStack> doApply(List<ItemStack> generatedLoot, LootContext context) {
        generatedLoot.add(new ItemStack(dust, 1));
        return generatedLoot;
    }

You would have a field for the dust that you would deserialize to (look at how the reward field is deserialized) and would not need the other two fields at all.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Posted
On 10/23/2020 at 1:43 AM, Draco18s said:

Under the assumption that your condition is only ever true for witches (I haven't messed with entity predicates, so I am not sure that your condition is actually what you want) the "alter this section" is very easy:


    @Nonnull
    @Override
    public List<ItemStack> doApply(List<ItemStack> generatedLoot, LootContext context) {
        generatedLoot.add(new ItemStack(dust, 1));
        return generatedLoot;
    }

You would have a field for the dust that you would deserialize to (look at how the reward field is deserialized) and would not need the other two fields at all.

 

Okay so I changed it, and I doubled and triple checked to see if I have everything written right and my .json files in the right place. But in my error log it is giving me this error
 

[m[1;31m[12:11:24] [Render thread/ERROR] [ne.mi.co.lo.LootModifierManager/]: Couldn't parse loot modifier mwh:dust_drop
java.lang.NullPointerException: Cannot invoke "com.google.gson.JsonElement.isJsonObject()" because "element" is null
	at net.minecraftforge.common.loot.LootModifierManager.deserializeModifier(LootModifierManager.java:130) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraftforge.common.loot.LootModifierManager.lambda$apply$0(LootModifierManager.java:118) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?] {}
	at net.minecraftforge.common.loot.LootModifierManager.apply(LootModifierManager.java:116) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraftforge.common.loot.LootModifierManager.apply(LootModifierManager.java:57) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.client.resources.ReloadListener.lambda$reload$1(ReloadListener.java:14) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:714) ~[?:?] {}
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?] {}
	at net.minecraft.resources.AsyncReloader.lambda$new$3(AsyncReloader.java:66) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.run(ThreadTaskExecutor.java:139) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.util.concurrent.RecursiveEventLoop.run(RecursiveEventLoop.java:22) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveOne(ThreadTaskExecutor.java:109) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveUntil(ThreadTaskExecutor.java:122) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.Minecraft.func_238189_a_(Minecraft.java:1866) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.func_238195_a_(Minecraft.java:1719) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.func_238191_a_(Minecraft.java:1689) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screen.WorldSelectionList$Entry.func_214443_e(WorldSelectionList.java:364) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screen.WorldSelectionList$Entry.func_214438_a(WorldSelectionList.java:273) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screen.WorldSelectionList$Entry.func_231044_a_(WorldSelectionList.java:228) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.widget.list.AbstractList.func_231044_a_(AbstractList.java:292) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.INestedGuiEventHandler.func_231044_a_(INestedGuiEventHandler.java:31) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.MouseHelper.lambda$mouseButtonCallback$0(MouseHelper.java:92) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.gui.screen.Screen.func_231153_a_(Screen.java:425) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.MouseHelper.mouseButtonCallback(MouseHelper.java:90) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.MouseHelper.lambda$registerCallbacks$4(MouseHelper.java:185) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.execute(ThreadTaskExecutor.java:86) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.MouseHelper.lambda$registerCallbacks$5(MouseHelper.java:184) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:36) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
	at org.lwjgl.system.JNI.invokeV(Native Method) ~[lwjgl-3.2.2.jar:build 10] {}
	at org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:3101) ~[lwjgl-glfw-3.2.2.jar:build 10] {}
	at com.mojang.blaze3d.systems.RenderSystem.flipFrame(RenderSystem.java:93) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.MainWindow.flipFrame(MainWindow.java:304) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1010) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:589) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:184) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
	at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?] {}
	at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
	at java.lang.reflect.Method.invoke(Method.java:564) ~[?:?] {}
	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-7.0.1.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-7.0.1.jar:?] {}
	at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-7.0.1.jar:?] {}
	at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-7.0.1.jar:?] {}
	at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-7.0.1.jar:?] {}
	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:105) [forge-1.16.2-33.0.61_mapped_snapshot_20200514-1.16-recomp.jar:?] {}

 

Its saying that "element" is null but I don't know what its referring to. Is it something is the doApply method or is it something in my Serializer? I removed somethings in my Serializer so it looks like this now:

 

private static abstract class Serializer extends GlobalLootModifierSerializer<VanillaMobModifier> 
    {

       @Override
       public VanillaMobModifier read(ResourceLocation name, JsonObject object, ILootCondition[] conditionsIn) 
       {
           Item dust = ForgeRegistries.ITEMS.getValue(new ResourceLocation(JSONUtils.getString(object, "item")));
           return new VanillaMobModifier(conditionsIn, dust);
       }

    }

 

I noticed that in the documentation that the class was private and static but for me it gives me an error saying to add unimplemented methods or to make it abstract. when I click on add unimplemented methods, this method is added:

 

	@Override
	public JsonObject write(VanillaMobModifier instance)
	{
		// TODO Auto-generated method stub
		return null;
	}

 

Making it abstract removes the error line under Serializer but I would still this NullPointerException error.

 

Posted (edited)
2 hours ago, HeyImAmethyst said:

[m[1;31m[12:11:24] [Render thread/ERROR] [ne.mi.co.lo.LootModifierManager/]: Couldn't parse loot modifier mwh:dust_drop java.lang.NullPointerException: Cannot invoke "com.google.gson.JsonElement.isJsonObject()" because "element" is null

Your json file does not match your deserialization method. You need to make your deserialize (the read method) match your json structure.

 

2 hours ago, HeyImAmethyst said:

Making it abstract removes the error line under

No, do not do this. Actually implement the method. It should mirror your deserialization method, so that your json file is generated by it and properly deserializes.

Edited by Draco18s

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Posted
1 hour ago, Draco18s said:

Your json file does not match your deserialization method. You need to make your deserialize (the read method) match your json structure.

 

It doesn't? Wait so the does read method reads the json file and the write method writes it out? What would I need to put in read method then? Because in the documentation it says that the conditions are already deserialized or was that specific to that code? Im looking online about reading and writing json files and I saw these:

https://stackoverflow.com/questions/10926353/how-to-read-json-file-into-java-with-simple-json-library
https://stackoverflow.com/questions/2591098/how-to-parse-json-in-java
https://www.geeksforgeeks.org/parse-json-java/

 

Is that what I need to do? Like figure out how to map the code to the json?

Posted
2 hours ago, HeyImAmethyst said:

Wait so the does read method reads the json file and the write method writes it out?

GASP. WHO'D HAVE GUESSED.

Yes, yes it does.

That's literally why they are there. Json resources aren't magic.

2 hours ago, HeyImAmethyst said:

Because in the documentation it says that the conditions are already deserialized or was that specific to that code?

Conditions are automatically deserialized.

Not the rest of it. Conditions are JUST this part:

On 10/22/2020 at 5:47 PM, HeyImAmethyst said:

  "conditions": 
  [
    {
      "condition": "minecraft:killed_by_player"
    },
    
    {
		"condition": "minecraft:entity_properties",
		"predicate": {
		  "type": "minecraft:witch"
		},
		"entity": "this"
	}
  ],

 

2 hours ago, HeyImAmethyst said:

Like figure out how to map the code to the json?

...yes

You have custom data. So read your custom data.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.

 

Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.

 

DO NOT PM ME WITH PROBLEMS. No help will be given.

Posted
On 10/24/2020 at 7:57 PM, Draco18s said:

GASP. WHO'D HAVE GUESSED.

Yes, yes it does.

That's literally why they are there. Json resources aren't magic.

 

Yea, I realized how obvious it was after I wrote my comment XD. I'm going to try and get this to work. Thanks for your help!

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Announcements



  • Recently Browsing

    • No registered users viewing this page.
  • Posts

    • https://mclo.gs/46Xf7Sq thanks
    • That seems to have fixed it, thank you!
    • I am having some issues starting an RLCraft server on a minimal install of Debian 12. I have Java installed and I'm able to start the vanilla Minecraft server jar no problem and people can join and play without any issues, as soon as I try to create a new directory with the Forge jar the initial install with the INSTALLER jar works when I use the java command with the --installServer flag, but as soon as I try to start the server using the forge jar that is NOT labelled with installer I get the following error: A problem occurred running the Server launcher.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:569)         at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)         at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')         at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)         at net.minecraft.launchwrapper.Launch.main(Launch.java:28)         ... 6 more   I have tried using newer versions of Java directly from Oracle as well. Has anybody been successful in starting and running a RLCraft server from the terminal on a Linux machine? I cannot figure out why it doesn't want to work but the vanilla jar works without issue. Thank you in advance!
    • This is my latest attempt :  public class ManaScreen extends Screen { Mana mana = new Mana(); boolean removeManaBar = false; ResourceLocation manaBar = ResourceLocation.fromNamespaceAndPath(RSGArmoury.MOD_ID, "/textures/block/spawnable_arena_wall.png"); public ManaScreen() { super(Component.literal("Mana")); } @Override protected void init() { super.init(); Minecraft.getInstance().setScreen(this); } @Override public boolean isPauseScreen() { return false; } @Override public void render(GuiGraphics pGuiGraphics, int pMouseX, int pMouseY, float pPartialTick) { pGuiGraphics.blit(manaBar, 10, -10, 0, 0, mana.getMana(), 10, mana.getMana(), 10); if (removeManaBar) { this.onClose(); return; } super.render(pGuiGraphics, pMouseX, pMouseY, pPartialTick); } public void addManaBar() { removeManaBar = false; Minecraft.getInstance().setScreen(new ManaScreen()); } public boolean removeManaBar() { return removeManaBar = true; } }
  • Topics

  • Who's Online (See full list)

    • There are no registered users currently online
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.