获取属性值时的NullPointerException

版本信息
你使用的IDE：IntelliJ IDEA
你使用的IDE版本:2020.1
Forge版本: 31.1.46
Minecraft版本:1.15.2
Mapping 文件版本:20200520

错误情况简述
我给原版玩家增加了两个属性job和team来进行一些判定，但是在使用.getAttributeMap().getEntityAttribute(...).getValue()的时候报错。

报错日志

[14:48:47] [Render thread/FATAL] [minecraft/Minecraft]: Reported exception thrown!
net.minecraft.crash.ReportedException: Colliding entity with block
	at net.minecraft.world.World.guardEntityTick(World.java:591) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.world.ClientWorld.tickEntities(ClientWorld.java:152) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1457) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:942) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:559) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:177) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241] {}
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_241] {}
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_241] {}
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_241] {}
	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-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-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {}
Caused by: java.lang.NullPointerException
	at com.uss_shenzhou.rainbow6.blocks.BarbedWire.onEntityCollision(BarbedWire.java:41) ~[main/:?] {re:classloading}
	at net.minecraft.block.BlockState.onEntityCollision(BlockState.java:282) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.Entity.doBlockCollisions(Entity.java:877) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.Entity.move(Entity.java:615) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.move(ClientPlayerEntity.java:917) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.entity.LivingEntity.travel(LivingEntity.java:2040) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.travel(PlayerEntity.java:1622) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2453) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.livingTick(PlayerEntity.java:534) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.livingTick(ClientPlayerEntity.java:835) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.tick(PlayerEntity.java:237) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.tick(ClientPlayerEntity.java:220) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.world.ClientWorld.updateEntity(ClientWorld.java:182) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.world.World.guardEntityTick(World.java:586) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	... 16 more
[14:48:47] [Render thread/INFO] [STDOUT/]: [net.minecraft.util.registry.Bootstrap:printToSYSOUT:110]: ---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 20-5-21 下午2:48
Description: Colliding entity with block

java.lang.NullPointerException: Colliding entity with block
	at com.uss_shenzhou.rainbow6.blocks.BarbedWire.onEntityCollision(BarbedWire.java:41) ~[main/:?] {re:classloading}
	at net.minecraft.block.BlockState.onEntityCollision(BlockState.java:282) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.Entity.doBlockCollisions(Entity.java:877) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.Entity.move(Entity.java:615) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.move(ClientPlayerEntity.java:917) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.entity.LivingEntity.travel(LivingEntity.java:2040) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.travel(PlayerEntity.java:1622) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2453) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.livingTick(PlayerEntity.java:534) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.livingTick(ClientPlayerEntity.java:835) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.player.PlayerEntity.tick(PlayerEntity.java:237) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.entity.player.ClientPlayerEntity.tick(ClientPlayerEntity.java:220) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.world.ClientWorld.updateEntity(ClientWorld.java:182) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.world.World.guardEntityTick(World.java:586) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.client.world.ClientWorld.tickEntities(ClientWorld.java:152) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1457) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:942) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.Minecraft.run(Minecraft.java:559) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.main.Main.main(Main.java:177) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {re:classloading,pl:runtimedistcleaner:A}
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_241] {}
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_241] {}
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_241] {}
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_241] {}
	at net.minecraftforge.userdev.FMLUserdevClientLaunchProvider.lambda$launchService$0(FMLUserdevClientLaunchProvider.java:55) ~[forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-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-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar:?] {}


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

-- Head --
Thread: Render thread
Stacktrace:
	at com.uss_shenzhou.rainbow6.blocks.BarbedWire.onEntityCollision(BarbedWire.java:41)
	at net.minecraft.block.BlockState.onEntityCollision(BlockState.java:282)

-- Block being collided with --
Details:
	Block: Block{rainbow6:barbedwire}
	Block location: World: (209,4,-315), Chunk: (at 1,0,5 in 13,-20; contains blocks 208,0,-320 to 223,255,-305), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
	at net.minecraft.entity.Entity.doBlockCollisions(Entity.java:877)

-- Entity being checked for collision --
Details:
	Entity Type: minecraft:player (net.minecraft.client.entity.player.ClientPlayerEntity)
	Entity ID: 19
	Entity Name: Dev
	Entity's Exact location: 209.98, 4.16, -313.72
	Entity's Block location: World: (209,4,-314), Chunk: (at 1,0,6 in 13,-20; contains blocks 208,0,-320 to 223,255,-305), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: -0.09, -0.00, -0.19
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.entity.Entity.move(Entity.java:615)
	at net.minecraft.client.entity.player.ClientPlayerEntity.move(ClientPlayerEntity.java:917)
	at net.minecraft.entity.LivingEntity.travel(LivingEntity.java:2040)
	at net.minecraft.entity.player.PlayerEntity.travel(PlayerEntity.java:1622)
	at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2453)
	at net.minecraft.entity.player.PlayerEntity.livingTick(PlayerEntity.java:534)
	at net.minecraft.client.entity.player.ClientPlayerEntity.livingTick(ClientPlayerEntity.java:835)
	at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264)
	at net.minecraft.entity.player.PlayerEntity.tick(PlayerEntity.java:237)
	at net.minecraft.client.entity.player.ClientPlayerEntity.tick(ClientPlayerEntity.java:220)
	at net.minecraft.client.world.ClientWorld.updateEntity(ClientWorld.java:182)

-- Entity being ticked --
Details:
	Entity Type: minecraft:player (net.minecraft.client.entity.player.ClientPlayerEntity)
	Entity ID: 19
	Entity Name: Dev
	Entity's Exact location: 209.98, 4.16, -313.72
	Entity's Block location: World: (209,4,-314), Chunk: (at 1,0,6 in 13,-20; contains blocks 208,0,-320 to 223,255,-305), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: -0.09, -0.00, -0.19
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.world.World.guardEntityTick(World.java:586)
	at net.minecraft.client.world.ClientWorld.tickEntities(ClientWorld.java:152)

-- Affected level --
Details:
	All players: 1 total; [ClientPlayerEntity['Dev'/19, l='MpServer', x=209.98, y=4.16, z=-313.72]]
	Chunk stats: Client Chunk Cache: 529, 324
	Level dimension: DimensionType{minecraft:overworld}
	Level name: MpServer
	Level seed: 5923470984027960334
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: {}
	Level spawn location: World: (176,4,-192), Chunk: (at 0,0,0 in 11,-12; contains blocks 176,0,-192 to 191,255,-177), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 492605 game time, 1163 day time
	Known server brands: 
	Level was modded: false
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Server brand: forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.world.ClientWorld.fillCrashReport(ClientWorld.java:457)
	at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:1840)
	at net.minecraft.client.Minecraft.run(Minecraft.java:573)
	at net.minecraft.client.main.Main.main(Main.java:177)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	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)

-- System Details --
Details:
	Minecraft Version: 1.15.2
	Minecraft Version ID: 1.15.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_241, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1235695208 bytes (1178 MB) / 2050490368 bytes (1955 MB) up to 3793747968 bytes (3618 MB)
	CPUs: 4
	JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	ModLauncher: 5.0.0-milestone.4+67+b1a340b
	ModLauncher launch target: fmluserdevclient
	ModLauncher naming: mcp
	ModLauncher services: 
		/eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE 
		/forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-launcher.jar object_holder_definalize PLUGINSERVICE 
		/forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-launcher.jar runtime_enum_extender PLUGINSERVICE 
		/accesstransformers-2.0.4-shadowed.jar accesstransformer PLUGINSERVICE 
		/forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-launcher.jar capability_inject_definalize PLUGINSERVICE 
		/forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-launcher.jar runtimedistcleaner PLUGINSERVICE 
		/forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-launcher.jar fml TRANSFORMATIONSERVICE 
	FML: 31.1
	Forge: net.minecraftforge:31.1.46
	FML Language Providers: 
		[email protected]
		minecraft@1
	Mod List: 
		client-extra.jar Minecraft {[email protected] DONE}
		forge-1.15.2-31.1.46_mapped_snapshot_20200508-1.15.1-recomp.jar Forge {[email protected] DONE}
		main Rainbow6siege {[email protected] DONE}
	Launched Version: MOD_DEV
	Backend library: LWJGL version 3.2.2 build 10
	Backend API: GeForce GTX 1050 Ti/PCIe/SSE2 GL version 4.6.0 NVIDIA 442.59, NVIDIA Corporation
	GL Caps: Using framebuffer using OpenGL 3.0
	Using VBOs: Yes
	Is Modded: Definitely; Client brand changed to 'forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: 简体中文 (中国)
	CPU: 4x Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz
[14:48:47] [Render thread/INFO] [STDOUT/]: [net.minecraft.util.registry.Bootstrap:printToSYSOUT:110]: #@!@# Game crashed! Crash report saved to: #@!@# F:\MC mod\forge-1.14.4-28.2.3-mdk\run\.\crash-reports\crash-2020-05-21_14.48.47-client.txt
AL lib: (EE) alc_cleanup: 1 device not closed

Process finished with exit code -1

相关代码
BarbedWire.java team判定有关部分
参考了原版的浆果SweetBerryBushBlock.java

    @Override
    public void onEntityCollision(BlockState state, World worldIn, BlockPos pos, Entity entityIn) {
        if (entityIn instanceof PlayerEntity && ((PlayerEntity) entityIn).getAttributes().getAttributeInstance(OPERATOR_TEAM).getValue()==1){
                entityIn.setMotionMultiplier(state, new Vec3d(0.85d, 0.4D,0.85d));

        }
    }

Utils.java增加属性的部分

    public static final IAttribute OPERATOR_JOB = new RangedAttribute(null,"r6_operator_job",0,0,54);
    //0:has not chose & spectator;    1~27:Attackers in turn;    28~54:Defenders in turn
    public static final IAttribute OPERATOR_TEAM = new RangedAttribute(null,"r6_operator_team",0,-1,1);
    //-1:defender    0:spectator    1:attacker
    @SubscribeEvent
    public static void entityInit(PlayerEvent.PlayerLoggedInEvent event){
        final PlayerEntity player = event.getPlayer();
        player.getAttributes().registerAttribute(OPERATOR_JOB);
        player.getAttributes().registerAttribute(OPERATOR_TEAM);
        }

查到的资料
主要参照https://harbinger.covertdragon.team/chapter-08/attribute/

PlayerEvent.PlayerLoggedInEvent下过断点吗？
确定属性已经添加进去了？

刚刚试了，没有。。。
PS:在Harbinger中有用到EntityLivingBase这个东西，但是1.15.2貌似没了？我就做了一点改动，但是感觉不是这个的原因。

PlayerLoggedInEvent 这个事件的触发是在服务端，所以这会导致客户端的玩家实体属性未注册，从而导致空指。

根据Harbinger的

// setShouldWatch(false) 会令逻辑客户端看不到该属性的变化。
// 如果你不希望客户端看到这个值，或者客户端不需要知道这个值，可以用它
// 来稍微节约一点点带宽。
public static final IAttribute MAGIC_POWER = new RangedAttribute(null, "my_mod.attribute.magic", 0.0, 0.0, 20.0).setShouldWatch(false);

看起来这个setShouldWatch为ture的话会进行同步的啊？

EntityLivingBase -> LivingEntity
EntityLiving -> MobEntity
—3T

你根本没有注册进去……
注册的代码就没有执行。

另外，我看你的变量名，实现这个功能用Capability可能更适合，当然用不用取决于你。

感觉这两个job和team用capability有点大材小用了。我只是想在触发一些东西时（比如在tick、onImpact、onEntityCollision等）用来判定，而且应该也不会有别人用这个
另外，折腾了半天，还是不知道为什么没注册上？不过Harbinger里面用的EntityLivingBase大概明白了，但是我获取的直接是player，应该就不用去if了。

阅读 Neutrino 中的事件部分
贴出注册部分的完整代码。
按照下图排查错误（图片 by 3T）

2B49FC4A6067EB3A65311736480F58C01172×321 79.7 KB

左弄右弄还是不行…现在是这样的：

package com.uss_shenzhou.rainbow6.util;

import net.minecraft.entity.ai.attributes.IAttribute;
import net.minecraft.entity.ai.attributes.RangedAttribute;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraftforge.event.entity.player.PlayerEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber
public class ModEventListener {
    public static final IAttribute OPERATOR_JOB = new RangedAttribute(null,"r6_operator_job",0,0,54).setShouldWatch(true);
    //-10~-6:recruit Attacker    -5~-1:recruit Defender    0:has not chose & spectator;    1~28:Attackers in turn;    29~56:Defenders in turn
    public static final IAttribute OPERATOR_TEAM = new RangedAttribute(null,"r6_operator_team",0,-1,1).setShouldWatch(true);
    //-1:defender    0:spectator    1:attacker
    @SubscribeEvent
    public static void R6AlliesAndEnemies(PlayerEvent.PlayerLoggedInEvent event){
        final PlayerEntity player = event.getPlayer();
        player.getAttributes().registerAttribute(OPERATOR_JOB);
        player.getAttributes().registerAttribute(OPERATOR_TEAM);
    }
}

根据查找到的资料
IAttribute 是服务端才有的属性，你只能在服务端调用。
建议直接用Cap实现这个功能。

如果你真的要用 Attribute ，建议更换事件。或者通过自己发包解决客户端未注册的问题。

目前的测试似乎是如果客户端未注册，则即便shouldWatch为true，也不能够同步。

目前实测可行的事件是 EntityConstructing（Harbinger用的不就是这个么？！），如下

    @SubscribeEvent
    public static void onEntityConstructing(EntityEvent.EntityConstructing event)
    {
        if (event.getEntity() instanceof PlayerEntity)
            ((PlayerEntity) event.getEntity()).getAttributes().registerAttribute(OPERATOR_TEAM);
    }

便于日后维护和拓展的话，Capability会是更好的选择。（有这个时间，Cap早写完了！）

一并 @RoitoLeonine ，谢谢两位的解答！看起来还是用capability吧

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获取属性值时的NullPointerException

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