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Posted (edited)

Working on a terrain scanner that starts scanning from a block position:1 north  a east, b west & 2 south a east, b west for loop on directions (not sure its accuracy yet)

I have made a class for it as utility, where it checks each block position scanning if its in ground or in air. if its in ground it should go up through a loop in position coordinates till it it is no more ground and record the top gound(dirt/grass/stone), its its in the air(air/log/leaf) bring the position coordinates down till there is no more air and the under the last block of air record the ground block

Here is my git, and the specific method i am dealing with

 

and now ill show you what the problem is

[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:grass} POS BlockPos{x=90, y=63, z=257}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:dirt} POS BlockPos{x=94, y=63, z=257}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:stone} POS BlockPos{x=99, y=63, z=257}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:stone} POS BlockPos{x=105, y=63, z=257}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:stone} POS BlockPos{x=105, y=63, z=262}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:stone} POS BlockPos{x=104, y=63, z=262}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:stone} POS BlockPos{x=102, y=63, z=262}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:dirt} POS BlockPos{x=99, y=63, z=262}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:dirt} POS BlockPos{x=95, y=63, z=262}
[00:38:45] [Server thread/INFO] [testmod]:  BLOCK Block{minecraft:dirt} POS BlockPos{x=90, y=63, z=262}

I have checked where the stones are too, in-closed by dirt and grass

Edited by clowcadia
to note
Posted (edited)

There are so many things wrong here....Why are you using | instead of ||?

 

Anyway, your problem is thus:

1a. for(int u = 1;
 b.   isGround(pos.up(u));
 c.   u++){
2.         if(isAir(pos.up(u))) {
3.             floor = pos.up(u-1);
4.         }
5. }

Line 1a executes: u = 1

Line 1b executes: the block is dirt, returns true

Line 2 executes: returns false (it was ground, so it cannot be air)

Line 4 executes [end of loop, returning to top]

Line 1c executes: u = 2

Line 1b executes: the block is air, returns false

Line 5 executes [end of block]

 

And you would know this without wasting my time if:

a) you doodled on some paper and tried running through it yourself

b) you used the debugger that God gave you and watched your code execute

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

What happens if a block is neither air nor ground?

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

 

based on this, it should technically register as something.. though

private boolean isGround(BlockPos pos){
        return (getBlock(pos) == Blocks.DIRT || getBlock(pos) == Blocks.GRASS) || getBlock(pos) == Blocks.STONE;
    }
    
    private boolean isAir(BlockPos pos){
        return getBlock(pos).isAir(getIBS(pos),this.world,pos) ||
                ( getBlock(pos) == Blocks.LOG || getBlock(pos) == Blocks.LOG2) ||
                (getBlock(pos) == Blocks.LEAVES || getBlock(pos) == Blocks.LEAVES2);
    }

i am missing tall grass but yea

Posted
6 minutes ago, clowcadia said:

 

based on this, it should technically register as something.. though


private boolean isGround(BlockPos pos){
        return (getBlock(pos) == Blocks.DIRT || getBlock(pos) == Blocks.GRASS) || getBlock(pos) == Blocks.STONE;
    }
    
    private boolean isAir(BlockPos pos){
        return getBlock(pos).isAir(getIBS(pos),this.world,pos) ||
                ( getBlock(pos) == Blocks.LOG || getBlock(pos) == Blocks.LOG2) ||
                (getBlock(pos) == Blocks.LEAVES || getBlock(pos) == Blocks.LEAVES2);
    }

i am missing tall grass but yea

What? This is a list of all vanilla blocks. You're missing more than just tall grass.

Posted

I know, i have a similar page open, but i am just testing it in somewhat controlled enviorment, its testing a 15x15 area in a forest, yes there are flowers but i dont think there is that many flowers to give me the results of air and stone of such amount

Posted (edited)
11 minutes ago, clowcadia said:

Question: can i edit code while i debug? with this specific situation

 
 
 

If you mean "Can I edit code while running the game", it depends on your IDE (but most of them have this feature). Eclipse has a little green beetle button next to the play button that runs the game in debug mode. While in debug mode, any non-breaking edits will be instantly noticeable in-game. If you make a breaking edit, Eclipse will tell you that you need to relaunch the game before the edit has an effect. I'm not sure about Intellij though.

Edited by TheMasterGabriel
  • Like 1
Posted

Should be able to with IntelliJ too.

But yes, it depends on the IDE.

 

Mind, there are some bits of your code that even if you make non-breaking edits, won't affect the running code, because that part already ran and won't run again. E.g. changes to constructors, your main class, etc.  The objects aren't reinitialized, just that their methods are updated.

  • Like 1

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 (edited)
1 hour ago, clowcadia said:

yes just want to try and fix the issues, in my head sudo wise its meant to work right but i am missing something

SUDO = Super User DO

Pseudo = "fake"

 

And yes, you are. You are incorrectly determining the end of the loop and the set-floor position booleans.  If it finds a floor, then the loop exits, right?  In which case make it so that when it sets the floor the loop exits. There's a dozen ways to do this and all of them fail proof. You're trying to use two checks that don't have an inverse relationship (i.e. isGround(state) == !isAir(state) is not true for all possible blockstates).

 

Again:

What happens if the column at the search location contains a tree? (Log on top of dirt)

Edited by Draco18s
  • Like 2

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

How about tall grass?

Flowers?

Fences?

Farmland?

Cobblestone?

Gravel?

Sand?

Sandstone?

Water?

Snow?

Ice?

Arbitrary mod-added block?

 

Your if-statements are poorly defined as "isAir() == !isGround()" is not a tautology.

 

What happens if your code encounters a cave (stone, air, stone)?

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

finally solved the issue, but now i am goign to take ur advice on the rest of the forestry stuff

but i dont know how to find the flower block as

getBlock(pos) == BlockFlower.;

does not display options like Blocks. does

Posted

there is only 2 types of flowers they have other varients that make them up as different flowers, but in general all but one flower is REDFLOWER and the one is YELLOWFLOWER in the blocks

Posted (edited)

Surprise.

http://minecraft.gamepedia.com/Flower#Data_values

There's three.

Edited by Draco18s
  • Like 1

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

That's precisely what it is.  A top half and a bottom half.

  • Like 1

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

Damn it, now i got a crash from these 2 lines

82 20

[15:10:18] [Client thread/INFO] [testmod]: ItemTarget: onItemUse
[15:10:18] [Server thread/INFO] [testmod]: ItemTarget: onItemUse
[15:10:18] [Server thread/INFO] [testmod]: ItemTarget: onItemUse: 0
[15:10:20] [Server thread/INFO] [testmod]: Test: initEntityAI
[15:10:20] [Server thread/INFO] [testmod]: AIGoto: Constructor
[15:10:20] [Server thread/INFO] [testmod]: Test: writeEntityFromNBT
[15:10:20] [Server thread/INFO] [testmod]: Test: readEntityFromNBT
[15:10:21] [Client thread/INFO] [testmod]: Test: processInteract
[15:10:21] [Server thread/INFO] [testmod]: Test: processInteract
[15:10:21] [Server thread/INFO] [testmod]: GuiHandler: Constructor
[15:10:21] [Server thread/INFO] [testmod]: ContainerBasic: Constructor
[15:10:21] [Server thread/INFO] [testmod]: Test: getCapability
[15:10:21] [Client thread/INFO] [testmod]: GuiHandler: getClientGuiElement
[15:10:21] [Client thread/INFO] [testmod]: ContainerBasic: Constructor
[15:10:21] [Client thread/INFO] [testmod]: Test: getCapability
[15:10:21] [Client thread/INFO] [testmod]: GuiBasic: Constructor
[15:10:23] [Server thread/INFO] [testmod]: AIGoto: startExecuting
[15:10:23] [Server thread/INFO] [testmod]: SL2
[15:10:23] [Server thread/INFO] [testmod]: EL7
[15:10:23] [Server thread/INFO] [testmod]: NL1
[15:10:23] [Server thread/INFO] [testmod]: WL3
[15:10:24] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Ticking entity
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:800) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:698) ~[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:547) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.rangeCheck(ArrayList.java:653) ~[?:1.8.0_121]
	at java.util.ArrayList.get(ArrayList.java:429) ~[?:1.8.0_121]
	at com.clowcadia.test.utils.TreeArea.<init>(TreeArea.java:20) ~[TreeArea.class:?]
	at com.clowcadia.test.entities.living.ai.AIGoto.updateTask(AIGoto.java:82) ~[AIGoto.class:?]
	at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(EntityAITasks.java:112) ~[EntityAITasks.class:?]
	at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:845) ~[EntityLiving.class:?]
	at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2466) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:639) ~[EntityLiving.class:?]
	at net.minecraft.entity.EntityAgeable.onLivingUpdate(EntityAgeable.java:194) ~[EntityAgeable.class:?]
	at net.minecraft.entity.passive.EntityAnimal.onLivingUpdate(EntityAnimal.java:46) ~[EntityAnimal.class:?]
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2292) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:343) ~[EntityLiving.class:?]
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2108) ~[World.class:?]
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:875) ~[WorldServer.class:?]
	at net.minecraft.world.World.updateEntity(World.java:2075) ~[World.class:?]
	at net.minecraft.world.World.updateEntities(World.java:1888) ~[World.class:?]
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:647) ~[WorldServer.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:794) ~[MinecraftServer.class:?]
	... 4 more
[15:10:24] [Server thread/ERROR]: This crash report has been saved to: C:\Users\Andre\OneDrive\Documents\Development\MinecraftForge\1.11\NPCTesting\run\.\crash-reports\crash-2017-03-28_15.10.24-server.txt
[15:10:24] [Server thread/INFO]: Stopping server
[15:10:24] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:600]: ---- Minecraft Crash Report ----
// Oops.

Time: 3/28/17 3:10 PM
Description: Ticking entity

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at com.clowcadia.test.utils.TreeArea.<init>(TreeArea.java:20)
	at com.clowcadia.test.entities.living.ai.AIGoto.updateTask(AIGoto.java:82)
	at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(EntityAITasks.java:112)
	at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:845)
	at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2466)
	at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:639)
	at net.minecraft.entity.EntityAgeable.onLivingUpdate(EntityAgeable.java:194)
	at net.minecraft.entity.passive.EntityAnimal.onLivingUpdate(EntityAnimal.java:46)
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2292)
	at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:343)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2108)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:875)
	at net.minecraft.world.World.updateEntity(World.java:2075)
	at net.minecraft.world.World.updateEntities(World.java:1888)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:647)
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:794)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:698)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:547)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Client thread
Stacktrace:
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at com.clowcadia.test.utils.TreeArea.<init>(TreeArea.java:20)
	at com.clowcadia.test.entities.living.ai.AIGoto.updateTask(AIGoto.java:82)
	at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(EntityAITasks.java:112)
	at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:845)
	at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2466)
	at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:639)
	at net.minecraft.entity.EntityAgeable.onLivingUpdate(EntityAgeable.java:194)
	at net.minecraft.entity.passive.EntityAnimal.onLivingUpdate(EntityAnimal.java:46)
	at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2292)
	at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:343)
	at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:2108)
	at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:875)
	at net.minecraft.world.World.updateEntity(World.java:2075)

-- Entity being ticked --
Details:
	Entity Type: testmod:test (com.clowcadia.test.entities.living.Test)
	Entity ID: 7456
	Entity Name: entity.Test.name
	Entity's Exact location: 415.15, 68.00, 356.36
	Entity's Block location: World: (415,68,356), Chunk: (at 15,4,4 in 25,22; contains blocks 400,0,352 to 415,255,367), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: 0.01, -0.08, 0.01
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.world.World.updateEntities(World.java:1888)
	at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:647)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [EntityPlayerMP['Lynthos'/1688, l='New World', x=415.04, y=68.00, z=351.89]]
	Chunk stats: ServerChunkCache: 771 Drop: 0
	Level seed: 1643567088598055580
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (224,64,248), Chunk: (at 0,4,8 in 14,15; contains blocks 224,0,240 to 239,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1205 game time, 1205 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 36149 (now: false), thunder time: 92532 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:794)
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:698)
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:547)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.11.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_121, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 237966296 bytes (226 MB) / 931135488 bytes (888 MB) up to 1871708160 bytes (1785 MB)
	JVM Flags: 0 total; 
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	FML: MCP 9.38 Powered by Forge 13.20.0.2228 5 mods loaded, 5 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCHIJAAAA	minecraft{1.11.2} [Minecraft] (minecraft.jar) 
	UCHIJAAAA	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
	UCHIJAAAA	FML{8.0.99.99} [Forge Mod Loader] (forgeSrc-1.11.2-13.20.0.2228.jar) 
	UCHIJAAAA	forge{13.20.0.2228} [Minecraft Forge] (forgeSrc-1.11.2-13.20.0.2228.jar) 
	UCHIJAAAA	testmod{1.0.0} [Test Mod] (NPCTesting_main) 
	Loaded coremods (and transformers): 
	GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [EntityPlayerMP['Lynthos'/1688, l='New World', x=415.04, y=68.00, z=351.89]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'
[15:10:24] [Server thread/INFO]: Saving players
[15:10:24] [Client thread/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:600]: #@!@# Game crashed! Crash report saved to: #@!@# .\crash-reports\crash-2017-03-28_15.10.24-server.txt
[15:10:24] [Client thread/INFO] [FML]: Waiting for the server to terminate/save.
[15:10:24] [Server thread/INFO]: Saving worlds
[15:10:24] [Server thread/INFO]: Saving chunks for level 'New World'/Overworld
[15:10:24] [Server thread/INFO] [testmod]: Test: writeEntityFromNBT
[15:10:24] [Server thread/INFO]: Saving chunks for level 'New World'/Nether
[15:10:24] [Server thread/INFO]: Saving chunks for level 'New World'/The End
[15:10:24] [Server thread/INFO] [FML]: Unloading dimension 0
[15:10:24] [Server thread/INFO] [FML]: Unloading dimension -1
[15:10:24] [Server thread/INFO] [FML]: Unloading dimension 1
[15:10:24] [Server thread/INFO] [FML]: Applying holder lookups
[15:10:24] [Server thread/INFO] [FML]: Holder lookups applied
[15:10:24] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded.
[15:10:24] [Client thread/INFO] [FML]: Server terminated.
[15:10:24] [Client Shutdown Thread/INFO]: Stopping server
[15:10:24] [Client Shutdown Thread/INFO]: Saving players
AL lib: (EE) alc_cleanup: 1 device not closed

Process finished with exit code -1

 

Posted (edited)
1 hour ago, clowcadia said:

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
...
	at com.clowcadia.test.utils.TreeArea.<init>(TreeArea.java:20)

 

Reading crash reports is not that much of a mystery. In line 20 of your TreeArea class, you are trying to get the 1 index of an ArrayList which only contains one element (and therefore no 1 index).

Edited by Jay Avery
Posted

Well, the crash report says the ArrayList is size one, which means it did have a 0 index. But if it doesn't, that means you're trying to call it on an empty ArrayList. Post the code where you create and use the list.

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    • Version 1.19 - Forge 41.0.63 I want to create a wolf entity that I can ride, so far it seems to be working, but the problem is that when I get on the wolf, I can’t control it. I then discovered that the issue is that the server doesn’t detect that I’m riding the wolf, so I’m struggling with synchronization. However, it seems to not be working properly. As I understand it, the server receives the packet but doesn’t register it correctly. I’m a bit new to Java, and I’ll try to provide all the relevant code and prints *The comments and prints are translated by chatgpt since they were originally in Spanish* Thank you very much in advance No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. No player is mounted, or the passenger is not a player. MountableWolfEntity package com.vals.valscraft.entity; import com.vals.valscraft.network.MountSyncPacket; import com.vals.valscraft.network.NetworkHandler; import net.minecraft.client.Minecraft; import net.minecraft.network.syncher.EntityDataAccessor; import net.minecraft.network.syncher.EntityDataSerializers; import net.minecraft.network.syncher.SynchedEntityData; import net.minecraft.server.MinecraftServer; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.EntityType; import net.minecraft.world.entity.Mob; import net.minecraft.world.entity.ai.attributes.AttributeSupplier; import net.minecraft.world.entity.ai.attributes.Attributes; import net.minecraft.world.entity.animal.Wolf; import net.minecraft.world.entity.player.Player; import net.minecraft.world.entity.Entity; import net.minecraft.world.InteractionHand; import net.minecraft.world.InteractionResult; import net.minecraft.world.item.ItemStack; import net.minecraft.world.item.Items; import net.minecraft.world.level.Level; import net.minecraft.world.phys.Vec3; import net.minecraftforge.event.TickEvent; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.network.PacketDistributor; public class MountableWolfEntity extends Wolf { private boolean hasSaddle; private static final EntityDataAccessor<Byte> DATA_ID_FLAGS = SynchedEntityData.defineId(MountableWolfEntity.class, EntityDataSerializers.BYTE); public MountableWolfEntity(EntityType<? extends Wolf> type, Level level) { super(type, level); this.hasSaddle = false; } @Override protected void defineSynchedData() { super.defineSynchedData(); this.entityData.define(DATA_ID_FLAGS, (byte)0); } public static AttributeSupplier.Builder createAttributes() { return Wolf.createAttributes() .add(Attributes.MAX_HEALTH, 20.0) .add(Attributes.MOVEMENT_SPEED, 0.3); } @Override public InteractionResult mobInteract(Player player, InteractionHand hand) { ItemStack itemstack = player.getItemInHand(hand); if (itemstack.getItem() == Items.SADDLE && !this.hasSaddle()) { if (!player.isCreative()) { itemstack.shrink(1); } this.setSaddle(true); return InteractionResult.SUCCESS; } else if (!level.isClientSide && this.hasSaddle()) { player.startRiding(this); MountSyncPacket packet = new MountSyncPacket(true); // 'true' means the player is mounted NetworkHandler.CHANNEL.sendToServer(packet); // Ensure the server handles the packet return InteractionResult.SUCCESS; } return InteractionResult.PASS; } @Override public void travel(Vec3 travelVector) { if (this.isVehicle() && this.getControllingPassenger() instanceof Player) { System.out.println("The wolf has a passenger."); System.out.println("The passenger is a player."); Player player = (Player) this.getControllingPassenger(); // Ensure the player is the controller this.setYRot(player.getYRot()); this.yRotO = this.getYRot(); this.setXRot(player.getXRot() * 0.5F); this.setRot(this.getYRot(), this.getXRot()); this.yBodyRot = this.getYRot(); this.yHeadRot = this.yBodyRot; float forward = player.zza; float strafe = player.xxa; if (forward <= 0.0F) { forward *= 0.25F; } this.flyingSpeed = this.getSpeed() * 0.1F; this.setSpeed((float) this.getAttributeValue(Attributes.MOVEMENT_SPEED) * 1.5F); this.setDeltaMovement(new Vec3(strafe, travelVector.y, forward).scale(this.getSpeed())); this.calculateEntityAnimation(this, false); } else { // The wolf does not have a passenger or the passenger is not a player System.out.println("No player is mounted, or the passenger is not a player."); super.travel(travelVector); } } public boolean hasSaddle() { return this.hasSaddle; } public void setSaddle(boolean hasSaddle) { this.hasSaddle = hasSaddle; } @Override protected void dropEquipment() { super.dropEquipment(); if (this.hasSaddle()) { this.spawnAtLocation(Items.SADDLE); this.setSaddle(false); } } @SubscribeEvent public static void onServerTick(TickEvent.ServerTickEvent event) { if (event.phase == TickEvent.Phase.START) { MinecraftServer server = net.minecraftforge.server.ServerLifecycleHooks.getCurrentServer(); if (server != null) { for (ServerPlayer player : server.getPlayerList().getPlayers()) { if (player.isPassenger() && player.getVehicle() instanceof MountableWolfEntity) { MountableWolfEntity wolf = (MountableWolfEntity) player.getVehicle(); System.out.println("Tick: " + player.getName().getString() + " is correctly mounted on " + wolf); } } } } } private boolean lastMountedState = false; @Override public void tick() { super.tick(); if (!this.level.isClientSide) { // Only on the server boolean isMounted = this.isVehicle() && this.getControllingPassenger() instanceof Player; // Only print if the state changed if (isMounted != lastMountedState) { if (isMounted) { Player player = (Player) this.getControllingPassenger(); // Verify the passenger is a player System.out.println("Server: Player " + player.getName().getString() + " is now mounted."); } else { System.out.println("Server: The wolf no longer has a passenger."); } lastMountedState = isMounted; } } } @Override public void addPassenger(Entity passenger) { super.addPassenger(passenger); if (passenger instanceof Player) { Player player = (Player) passenger; if (!this.level.isClientSide && player instanceof ServerPlayer) { // Send the packet to the server to indicate the player is mounted NetworkHandler.CHANNEL.send(PacketDistributor.PLAYER.with(() -> (ServerPlayer) player), new MountSyncPacket(true)); } } } @Override public void removePassenger(Entity passenger) { super.removePassenger(passenger); if (passenger instanceof Player) { Player player = (Player) passenger; if (!this.level.isClientSide && player instanceof ServerPlayer) { // Send the packet to the server to indicate the player is no longer mounted NetworkHandler.CHANNEL.send(PacketDistributor.PLAYER.with(() -> (ServerPlayer) player), new MountSyncPacket(false)); } } } @Override public boolean isControlledByLocalInstance() { Entity entity = this.getControllingPassenger(); return entity instanceof Player; } @Override public void positionRider(Entity passenger) { if (this.hasPassenger(passenger)) { double xOffset = Math.cos(Math.toRadians(this.getYRot() + 90)) * 0.4; double zOffset = Math.sin(Math.toRadians(this.getYRot() + 90)) * 0.4; passenger.setPos(this.getX() + xOffset, this.getY() + this.getPassengersRidingOffset() + passenger.getMyRidingOffset(), this.getZ() + zOffset); } } } MountSyncPacket package com.vals.valscraft.network; import com.vals.valscraft.entity.MountableWolfEntity; import net.minecraft.network.FriendlyByteBuf; import net.minecraft.server.level.ServerLevel; import net.minecraft.server.level.ServerPlayer; import net.minecraft.world.entity.Entity; import net.minecraft.world.entity.player.Player; import net.minecraftforge.network.NetworkEvent; import java.util.function.Supplier; public class MountSyncPacket { private final boolean isMounted; public MountSyncPacket(boolean isMounted) { this.isMounted = isMounted; } public void encode(FriendlyByteBuf buffer) { buffer.writeBoolean(isMounted); } public static MountSyncPacket decode(FriendlyByteBuf buffer) { return new MountSyncPacket(buffer.readBoolean()); } public void handle(NetworkEvent.Context context) { context.enqueueWork(() -> { ServerPlayer player = context.getSender(); // Get the player from the context if (player != null) { // Verifies if the player has dismounted if (!isMounted) { Entity vehicle = player.getVehicle(); if (vehicle instanceof MountableWolfEntity wolf) { // Logic to remove the player as a passenger wolf.removePassenger(player); System.out.println("Server: Player " + player.getName().getString() + " is no longer mounted."); } } } }); context.setPacketHandled(true); // Marks the packet as handled } } networkHandler package com.vals.valscraft.network; import com.vals.valscraft.valscraft; import net.minecraft.resources.ResourceLocation; import net.minecraftforge.network.NetworkRegistry; import net.minecraftforge.network.simple.SimpleChannel; import net.minecraftforge.network.NetworkEvent; import java.util.function.Supplier; public class NetworkHandler { private static final String PROTOCOL_VERSION = "1"; public static final SimpleChannel CHANNEL = NetworkRegistry.newSimpleChannel( new ResourceLocation(valscraft.MODID, "main"), () -> PROTOCOL_VERSION, PROTOCOL_VERSION::equals, PROTOCOL_VERSION::equals ); public static void init() { int packetId = 0; // Register the mount synchronization packet CHANNEL.registerMessage( packetId++, MountSyncPacket.class, MountSyncPacket::encode, MountSyncPacket::decode, (msg, context) -> msg.handle(context.get()) // Get the context with context.get() ); } }  
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