.MainClass.onEnable（MainClass.java:24）~[？：？] 在org.bukkit.plugin.java.JavaPlugin.setEnabled（JavaPlugin.java:271）~[spiget.jar:git-spiget-3fb9445-2b6c9f4] 在org.bukkit.plugin.java.JavaPluginLoader.enablePlugin（JavaPluginLoader.java:337）[spigot.jar:git-spigot-3fb9445-2b6c9f4]

唉，没有额外的源代码，我只能告诉你这些。检查

Fly

的构造函数和/或其超类，确保没有试图创建

JavaPlugin

派生类的另一个实例。我冒昧地猜测，

Fly

正在从

MainClass

或

JavaPlugin

扩展

JavaPlugin
是唯一扩展
JavaPlugin
的类吗？在没有任何其他插件的情况下测试插件。可能
Fly
是另一个类。。。StackTrace表示Fly.java第10行的构造函数正在调用JavaPluginIs的构造函数，它是扩展
JavaPlugin
的唯一类？在没有任何其他插件的情况下测试插件。可能
Fly
是另一个类。。。StackTrace表示Fly.java第10行的构造函数正在调用JavaPlugin的构造函数
package net.battleheroes.spigot.spacepvp;

import org.bukkit.Bukkit;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

import net.battleheroes.spigot.spacepvp.cmd.Feed;
import net.battleheroes.spigot.spacepvp.cmd.Fly;
import net.battleheroes.spigot.spacepvp.cmd.Heal;
import net.battleheroes.spigot.spacepvp.cmd.Kits;
import net.battleheroes.spigot.spacepvp.cmd.Spacepvp;
import net.battleheroes.spigot.spacepvp.cmd.gamemode;
import net.battleheroes.spigot.spacepvp.util.AdventureMode;
import net.battleheroes.spigot.spacepvp.util.ChatFormatting;
import net.battleheroes.spigot.spacepvp.util.Messages;

public class MainClass extends JavaPlugin implements ChatFormatting, Messages{


    public void onEnable() {
        Bukkit.getServer().getLogger().info(tag + green + enabled + orange + brand);

        registerCommands();
        registerEvents();

    }

    public void onDisable() {
        Bukkit.getServer().getLogger().info(tag + red + disabled + orange + brand);
    }

    public void registerCommands() {

        getCommand("spacepvp").setExecutor(new Spacepvp());
        getCommand("kit").setExecutor(new Kits());
        getCommand("heal").setExecutor(new Heal());
        getCommand("feed").setExecutor(new Feed());
        getCommand("fly").setExecutor(new Fly());
        getCommand("gamemode").setExecutor(new gamemode());

    }

    public void registerEvents() {
        PluginManager pm = getServer().getPluginManager();

         pm.registerEvents(new AdventureMode(), this);
    }


}

[07:41:11 ERROR]: Error occurred while enabling SpacePVP v0.4 (Is it up to date?)
java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:67) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.battleheroes.spigot.spacepvp.cmd.Fly.<init>(Fly.java:10) ~[?:?]
        at net.battleheroes.spigot.spacepvp.MainClass.registerCommands(MainClass.java:40) ~[?:?]
        at net.battleheroes.spigot.spacepvp.MainClass.onEnable(MainClass.java:24) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:271) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.enablePlugin(CraftServer.java:376) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.enablePlugins(CraftServer.java:326) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.MinecraftServer.t(MinecraftServer.java:421) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.MinecraftServer.l(MinecraftServer.java:382) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.MinecraftServer.a(MinecraftServer.java:337) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:272) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:544) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:125) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:67) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.battleheroes.spigot.spacepvp.MainClass.<init>(MainClass.java:18) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_121]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_121]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_121]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_121]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_121]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.loadPlugins(CraftServer.java:301) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:204) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        ... 2 more

java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:122) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:67) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]

--->    at net.battleheroes.spigot.spacepvp.cmd.Fly.<init>(Fly.java:10) ~[?:?]

        at net.battleheroes.spigot.spacepvp.MainClass.registerCommands(MainClass.java:40) ~[?:?]
        at net.battleheroes.spigot.spacepvp.MainClass.onEnable(MainClass.java:24) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:271) ~[spigot.jar:git-Spigot-3fb9445-2b6c9f4]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot.jar:git-Spigot-3fb9445-2b6c9f4]