java - IllegalArgumentException:在scheduleSyncDelayedTask方法中插件不能为null

Question

每当插件尝试运行此延迟的任务时，我都会收到“ IllegalArgumentException：插件不能为空”错误：

  Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin, 
                new Runnable() {
                    public void run() {                     
                        b.setType(Material.COAL_ORE);
                    }
                }, 500L);

错误：

29.07 00:22:24 [Server] ERROR Could not pass event BlockBreakEvent to Core v1.0.0
29.07 00:22:24 [Server] INFO org.bukkit.event.EventException
29.07 00:22:24 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerInteractManager.breakBlock(PlayerInteractManager.java:286) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerInteractManager.a(PlayerInteractManager.java:215) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:637) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:40) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:10) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_222]
29.07 00:22:24 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_222]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
29.07 00:22:24 [Server] INFO Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
29.07 00:22:24 [Server] INFO at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.validate(CraftScheduler.java:397) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:123) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:119) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:102) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
29.07 00:22:24 [Server] INFO at me.quib.rpgcore.EventsClass.onBlockBreak(EventsClass.java:720) ~[?:?]
29.07 00:22:24 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
29.07 00:22:24 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
29.07 00:22:24 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]

720行是：

Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {

我不知道为什么插件为空？

我在课程开始时就有了一个实现方法：

Main plugin;

public void initEventsClass(Main plugin) {
    this.plugin = plugin;
}

这是我在Main类开始时的代码：

    InventoryClass icp = new InventoryClass();
    EventsClass ecp = new EventsClass();


    private static Main instance;
    public static Main getInstance() {
        return instance;
    }

    @Override
    public void onEnable() {
        instance = this;
        icp.initInventoryClass(this);
        ecp.initEventsClass(this);
        getLogger().info("Quib's RPG Core Enabled");
        getServer().getPluginManager().registerEvents(this, this);
        getServer().getPluginManager().registerEvents(new EventsClass(), this);
        getConfig().options().copyDefaults(true);
    }

Answer 1

我没有使用适当的构造函数

public void initEventsClass(Main plugin) {

至

public void EventsClass(Main plugin) {

解决了这个问题！