1.8.8 java.lang.IllegalArgumentException：插件不能是 null

Question

我的插件上有这个错误，我一直试图解决很长时间，但我找不到解决方案，这就是我来这里寻求帮助的原因：我有这个错误：

at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [spigot.jar:git-Spigot-db6de12-18fbb24] at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-db6de12-18fbb24]
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
at java.base/java.lang.Thread.run(Thread.java:832) [?:?]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.validate(CraftScheduler.java:397) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:123) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:119) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:102) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
at tech.mssteur.ktcp9.objects.Game.launch(Game.java:88) ~[?:?]
at tech.mssteur.ktcp9.guis.ConfigMenu.lambda$init$1(ConfigMenu.java:61) ~[?:?]
at fr.minuskube.inv.ClickableItem.run(ClickableItem.java:26) ~[?:?]
at fr.minuskube.inv.InventoryManager$InvListener.lambda$onInventoryClick$2(InventoryManager.java:140) ~[?:?]
at java.base/java.util.Optional.ifPresent(Optional.java:176) ~[?:?]
at fr.minuskube.inv.InventoryManager$InvListener.onInventoryClick(InventoryManager.java:140) ~[?:?]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[?:?]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[?:?]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
... 15 more

Here is the Game class: https://pastebin.com/YkCPsXPN Here is the Main class: https://pastebin.com/WxGWaLUA

如果有人有解决此错误的解决方案，我将非常感谢他们，谢谢

Answer 1

当开发人员将错误的参数 arguments 提供给方法时，通常会引发 IllegalArgumentException。 在这种情况下，参数plugin是NULL 。 查看堆栈跟踪时，我们发现问题出在Game class 的load方法中，如下行所述：

at tech.mssteur.ktcp9.objects.Game.launch(Game.java:88) ~[?:?]

从前一行我们看到违规的方法调用是scheduleSyncDelayedTask

at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:102)

scheduleSyncDelayedTask方法接受一个需要初始化的plugin参数。 在你的情况下，它不是。

您有两个构造函数来初始化您的Game对象。 其中之一是设置您在调用scheduleSyncDelayedTask时使用的plugin字段。 您可能正在使用没有 arguments 的默认构造函数。 因此，您的plugin是NULL 。