尝试调用MCP中的函数时崩溃

Question

我试图使用1.8.8版本的ModCoderPack创建一个客户端，但是当我试图调用任何不在同一类中的函数时，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Client类的完整代码

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
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* 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实例传递给函数时起作用

Answer 1

这很简单:您面对的是一个NullPointerException，这意味着您正在尝试使用没有赋值的东西。我猜是这样的

this.gameSettings

不存在或尚未赋值，这意味着它为null。这会导致NullPointerExcepting崩溃。您可能需要编写

this.gameSettings = gs;

或者在可能的情况下只使用gs。这两种方法都应该有效。祝你好运:)