试图调用MCP中的函数时崩溃

Question

我试图使用ModCoderPack为1.8.8创建一个客户机，但是当我试图调用任何在同一个类中不存在的函数时，比如MC.DisplayGuisCreen，游戏就崩溃了。我有等待按键的代码

public void onKeyPressed(GameSettings gs) {
        if(gs.jbClientToggleMenu.isKeyDown()) {
            this.mc.displayGuiScreen(new ModManager());
    }
}

该函数在Minecraft.java中调用

else
{
    jbclient.onKeyPressed(this.gameSettings); // <-=

    if (k == 1)
    {
        this.displayInGameMenu();
    }

以下是客户端类的全部代码

代码：

public class Client {
    private final Minecraft mc = Minecraft.getMinecraft();
    private GameSettings gameSettings = new GameSettings();
    public static String clientName = "jbClient";
    public static String clientVersion = "0.01";

    public static final ModManager modManager = new ModManager();

    public static final Logger logger = LogManager.getLogger();

        public void onKeyPressed(GameSettings gs) {
            if(gs.jbClientToggleMenu.isKeyDown()) {
                this.mc.displayGuiScreen(new ModManager());
            }
        }
}

崩溃日志

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 6/18/20 5:53 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
    at jordanbaron.jbclient.Client.onKeyPressed(Client.java:23)
    at net.minecraft.client.Minecraft.runTick(Minecraft.java:1950)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1123)
    at net.minecraft.client.Minecraft.run(Minecraft.java:429)
    at net.minecraft.client.main.Main.main(Main.java:113)
    at Start.main(Start.java:11)


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

-- Head --
Stacktrace:
    at jordanbaron.jbclient.Client.onKeyPressed(Client.java:23)

-- Affected level --
Details:
    Level name: MpServer
    All players: 1 total; [EntityPlayerSP['Player824'/288, l='MpServer', x=87.13, y=81.00, z=-381.85]]
    Chunk stats: MultiplayerChunkCache: 583, 583
    Level seed: 0
    Level generator: ID 00 - default, ver 1. Features enabled: false
    Level generator options: 
    Level spawn location: -52.00,64.00,132.00 - World: (-52,64,132), Chunk: (at 12,4,4 in -4,8; contains blocks -64,0,128 to -49,255,143), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
    Level time: 5569 game time, 5569 day time
    Level dimension: 0
    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
    Forced entities: 84 total; [EntityCreeper['Creeper'/4096, l='MpServer', x=163.50, y=18.00, z=-365.50], EntityCreeper['Creeper'/4097, l='MpServer', x=159.50, y=18.00, z=-362.50], EntitySkeleton['Skeleton'/4099, l='MpServer', x=166.19, y=18.00, z=-366.66], EntitySkeleton['Skeleton'/2820, l='MpServer', x=156.50, y=27.00, z=-360.50], EntityBat['Bat'/3889, l='MpServer', x=99.47, y=12.53, z=-440.25], EntityZombie['Zombie'/4659, l='MpServer', x=35.50, y=55.00, z=-427.50], EntityBat['Bat'/2612, l='MpServer', x=51.44, y=49.59, z=-424.41], EntityZombie['Zombie'/4660, l='MpServer', x=34.50, y=55.00, z=-428.50], EntityRabbit['Rabbit'/826, l='MpServer', x=141.50, y=71.00, z=-426.50], EntityRabbit['Rabbit'/827, l='MpServer', x=138.34, y=72.00, z=-427.66], EntityRabbit['Rabbit'/828, l='MpServer', x=136.34, y=72.00, z=-427.66], EntityZombie['Zombie'/3139, l='MpServer', x=154.50, y=20.00, z=-324.50], EntityZombie['Zombie'/3140, l='MpServer', x=154.50, y=20.00, z=-325.50], EntityZombie['Zombie'/3141, l='MpServer', x=150.50, y=20.00, z=-322.50], EntityZombie['Zombie'/3142, l='MpServer', x=156.44, y=20.00, z=-324.06], EntityZombie['Zombie'/2376, l='MpServer', x=128.47, y=37.00, z=-366.81], EntityCreeper['Creeper'/2377, l='MpServer', x=129.06, y=38.00, z=-367.66], EntitySkeleton['Skeleton'/4426, l='MpServer', x=149.53, y=12.00, z=-461.66], EntitySpider['Spider'/2891, l='MpServer', x=160.69, y=40.09, z=-417.31], EntitySquid['Squid'/2898, l='MpServer', x=97.00, y=61.41, z=-403.77], EntitySquid['Squid'/2900, l='MpServer', x=100.53, y=58.30, z=-399.57], EntitySquid['Squid'/2901, l='MpServer', x=101.89, y=60.17, z=-386.47], EntitySquid['Squid'/2902, l='MpServer', x=102.47, y=57.00, z=-391.50], EntityBat['Bat'/4955, l='MpServer', x=153.43, y=17.07, z=-438.28], EntityCreeper['Creeper'/3932, l='MpServer', x=147.56, y=26.00, z=-459.94], EntityCreeper['Creeper'/3938, l='MpServer', x=97.50, y=18.00, z=-354.50], EntityCreeper['Creeper'/2147, l='MpServer', x=49.50, y=51.00, z=-342.50], EntitySkeleton['Skeleton'/3939, l='MpServer', x=95.50, y=18.00, z=-355.50], EntitySkeleton['Skeleton'/4966, l='MpServer', x=159.50, y=18.00, z=-363.50], EntitySkeleton['Skeleton'/4967, l='MpServer', x=157.50, y=18.00, z=-364.50], EntityBat['Bat'/3433, l='MpServer', x=147.27, y=11.30, z=-340.73], EntityBat['Bat'/3434, l='MpServer', x=144.89, y=12.05, z=-343.34], EntityPlayerSP['Player824'/288, l='MpServer', x=87.13, y=81.00, z=-381.85], EntityZombie['Zombie'/4208, l='MpServer', x=34.50, y=40.00, z=-334.50], EntityZombie['Zombie'/2673, l='MpServer', x=50.50, y=34.00, z=-424.50], EntitySkeleton['Skeleton'/3953, l='MpServer', x=21.94, y=25.00, z=-306.06], EntityWitch['Witch'/3186, l='MpServer', x=56.50, y=44.00, z=-421.50], EntitySpider['Spider'/3954, l='MpServer', x=19.91, y=25.00, z=-308.09], EntitySpider['Spider'/2674, l='MpServer', x=13.50, y=11.00, z=-376.50], EntityCreeper['Creeper'/3187, l='MpServer', x=47.50, y=44.00, z=-421.50], EntityZombie['Zombie'/2936, l='MpServer', x=112.50, y=17.00, z=-352.50], EntityZombie['Zombie'/2937, l='MpServer', x=113.81, y=16.00, z=-351.25], EntityZombie['Zombie'/3196, l='MpServer', x=33.50, y=35.00, z=-428.50], EntityItem['item.item.seeds'/386, l='MpServer', x=43.13, y=63.00, z=-357.88], EntityRabbit['Rabbit'/387, l='MpServer', x=34.50, y=68.00, z=-334.50], EntityRabbit['Rabbit'/388, l='MpServer', x=32.13, y=66.00, z=-330.88], EntityRabbit['Rabbit'/389, l='MpServer', x=32.75, y=66.00, z=-330.25], EntityCow['Cow'/1929, l='MpServer', x=111.50, y=65.00, z=-448.50], EntityCow['Cow'/1930, l='MpServer', x=113.50, y=66.00, z=-449.50], EntityCow['Cow'/1931, l='MpServer', x=115.50, y=66.00, z=-450.50], EntityCow['Cow'/1932, l='MpServer', x=115.50, y=66.00, z=-446.50], EntityChicken['Chicken'/1933, l='MpServer', x=100.47, y=64.00, z=-452.53], EntityChicken['Chicken'/1934, l='MpServer', x=104.50, y=65.00, z=-442.50], EntityChicken['Chicken'/1935, l='MpServer', x=108.50, y=65.00, z=-449.50], EntityChicken['Chicken'/1936, l='MpServer', x=109.50, y=65.00, z=-449.50], EntityCow['Cow'/406, l='MpServer', x=49.13, y=86.00, z=-402.06], EntityCow['Cow'/407, l='MpServer', x=43.88, y=83.00, z=-397.59], EntityCow['Cow'/408, l='MpServer', x=44.50, y=83.00, z=-394.50], EntityCow['Cow'/409, l='MpServer', x=44.50, y=88.00, z=-392.50], EntityZombie['Zombie'/3737, l='MpServer', x=91.28, y=11.06, z=-455.56], EntityBat['Bat'/5793, l='MpServer', x=66.75, y=35.10, z=-397.75], EntityCreeper['Creeper'/3509, l='MpServer', x=39.50, y=82.00, z=-373.50], EntityItem['item.item.seeds'/5064, l='MpServer', x=65.28, y=64.00, z=-362.81], EntitySquid['Squid'/5070, l='MpServer', x=39.81, y=60.75, z=-353.53], EntitySquid['Squid'/5071, l='MpServer', x=46.47, y=60.19, z=-347.03], EntityCreeper['Creeper'/3024, l='MpServer', x=153.50, y=24.00, z=-375.50], EntitySquid['Squid'/5072, l='MpServer', x=36.47, y=61.00, z=-350.34], EntityCreeper['Creeper'/3025, l='MpServer', x=156.50, y=24.00, z=-377.50], EntityEnderman['Enderman'/3795, l='MpServer', x=41.50, y=55.00, z=-432.50], EntityZombie['Zombie'/4315, l='MpServer', x=142.50, y=13.00, z=-443.50], EntitySkeleton['Skeleton'/3550, l='MpServer', x=91.50, y=23.00, z=-455.50], EntitySkeleton['Skeleton'/3552, l='MpServer', x=78.50, y=23.00, z=-458.16], EntitySkeleton['Skeleton'/3297, l='MpServer', x=28.16, y=25.00, z=-309.75], EntityZombie['Zombie'/744, l='MpServer', x=70.50, y=34.00, z=-312.50], EntitySkeleton['Skeleton'/745, l='MpServer', x=67.50, y=34.00, z=-316.50], EntityZombie['Zombie'/746, l='MpServer', x=70.50, y=34.00, z=-309.50], EntityBat['Bat'/3821, l='MpServer', x=162.75, y=15.66, z=-452.50], EntityRabbit['Rabbit'/494, l='MpServer', x=105.50, y=63.00, z=-398.50], EntitySkeleton['Skeleton'/2287, l='MpServer', x=109.50, y=18.00, z=-351.50], EntityRabbit['Rabbit'/495, l='MpServer', x=103.94, y=64.00, z=-401.88], EntityRabbit['Rabbit'/496, l='MpServer', x=109.53, y=66.00, z=-399.81], EntityRabbit['Rabbit'/2037, l='MpServer', x=109.78, y=65.00, z=-457.59], EntityCreeper['Creeper'/3574, l='MpServer', x=89.50, y=17.00, z=-459.50], EntityCreeper['Creeper'/3582, l='MpServer', x=48.50, y=55.00, z=-427.50]]
    Retry entities: 0 total; []
    Server brand: vanilla
    Server type: Integrated singleplayer server
Stacktrace:
    at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:390)
    at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2782)
    at net.minecraft.client.Minecraft.run(Minecraft.java:458)
    at net.minecraft.client.main.Main.main(Main.java:113)
    at Start.main(Start.java:11)

-- System Details --
Details:
    Minecraft Version: 1.8.9
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_251, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 837748936 bytes (798 MB) / 1532493824 bytes (1461 MB) up to 3806855168 bytes (3630 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
    Launched Version: mcp
    LWJGL: 2.9.4
    OpenGL: GeForce GTX 1660/PCIe/SSE2 GL version 4.6.0 NVIDIA 445.75, NVIDIA Corporation
    GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

    Using VBOs: No
    Is Modded: Very likely; Jar signature invalidated
    Type: Client (map_client.txt)
    Resource Packs: 
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 4x Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz

编辑：它在将Minecraft实例传递给函数时工作

Answer 1

这很简单：您正面临一个NullPointerException，这意味着您试图使用没有赋值的东西。我猜

this.gameSettings

要么不存在，要么尚未赋值，这意味着它为空。这将导致NullPointerExcepting导致崩溃。你可能需要写

this.gameSettings = gs;

或者如果可能的话只使用gs。两者都应该管用。好运：）