NoClassDefFoundError: com/destroystokyo/paper/event/player/PlayerArmorChangeEvent$SlotType

[SlimeDog]

Skript/Server Version

>sk info
[08:40:51] [Server thread/INFO]: [Skript] Skript's aliases can be found here: https://github.com/SkriptLang/skript-aliases
[08:40:51] [Server thread/INFO]: [Skript] Skript's documentation can be found here: https://docs.skriptlang.org/
[08:40:51] [Server thread/INFO]: [Skript] Skript's tutorials can be found here: https://docs.skriptlang.org/tutorials
[08:40:51] [Server thread/INFO]: [Skript] Server Version: 4477-Spigot-e339edc-ba251cc (MC: 1.21.5)
[08:40:51] [Server thread/INFO]: [Skript] Skript Version: 2.11.0-pre1 (skriptlang-github)
[08:40:51] [Server thread/INFO]: [Skript] Installed Skript Addons: None
[08:40:51] [Server thread/INFO]: [Skript] Installed dependencies: 
[08:40:51] [Server thread/INFO]: [Skript]  - Vault v1.7.3-b131
[08:40:51] [Server thread/INFO]: [Skript]  - WorldGuard v7.0.14-SNAPSHOT+2336-98b5220

Bug Description

Error enabling Skript on server start-up

Expected Behavior

Clean start-up

Steps to Reproduce

• Install Spigot 1.21.5-4477
• Install Skript 2.11.0-pre1
• Start server
• Read errors

Errors or Screenshots

[08:25:43] [Server thread/INFO]: [Skript] Enabling Skript v2.11.0-pre1
[08:25:46] [Server thread/INFO]: ^[[0;37;22m[^[[0;33;22mSkript^[[0;37;22m] ^[[mThe updater is disabled, so a check for the latest version of Skript was not performed.^[[m
[08:25:49] [Server thread/WARN]: [Skript] Loaded class net.kyori.adventure.sound.Sound$Builder from EntityCount v1.2.0 which is not a depend or softdepend of this plugin.
[08:25:50] [Server thread/ERROR]: Error occurred while enabling Skript v2.11.0-pre1 (Is it up to date?)
java.lang.NoClassDefFoundError: com/destroystokyo/paper/event/player/PlayerArmorChangeEvent$SlotType
        at ch.njol.skript.events.EvtPlayerArmorChange$1.<clinit>(EvtPlayerArmorChange.java:79) ~[?:?]
        at java.base/java.lang.Class.forName0(Native Method) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:543) ~[?:?]
        at org.skriptlang.skript.util.ClassLoader.loadClasses(ClassLoader.java:165) ~[?:?]
        at org.skriptlang.skript.util.ClassLoader.loadClasses(ClassLoader.java:95) ~[?:?]
        at ch.njol.skript.util.Utils.getClasses(Utils.java:212) ~[?:?]
        at ch.njol.skript.SkriptAddon.loadClasses(SkriptAddon.java:75) ~[?:?]
        at ch.njol.skript.Skript.onEnable(Skript.java:552) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:267) ~[spigot-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342) [spigot-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:492) [spigot-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_21_R4.CraftServer.enablePlugin(CraftServer.java:578) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]
        at org.bukkit.craftbukkit.v1_21_R4.CraftServer.enablePlugins(CraftServer.java:492) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:652) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]  
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]   
        at net.minecraft.server.dedicated.DedicatedServer.e(DedicatedServer.java:268) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc] 
        at net.minecraft.server.MinecraftServer.y(MinecraftServer.java:1007) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:325) [spigot-1.21.5-R0.1-SNAPSHOT.jar:4477-Spigot-e339edc-ba251cc]
        at java.base/java.lang.Thread.run(Thread.java:1447) [?:?]
Caused by: java.lang.ClassNotFoundException: com.destroystokyo.paper.event.player.PlayerArmorChangeEvent$SlotType
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:160) ~[spigot-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:112) ~[spigot-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
        ... 19 more

Other

No response

Agreement

• I have read the guidelines above and affirm I am following them with this report.

[Fusezion]

Caused by the switch statement, unsure how to go around fixing this, unsure how it even got to that point in the code if no event was registered

Skript/src/main/java/ch/njol/skript/events/EvtPlayerArmorChange.java

Lines 75 to 86 in db0ac23

	public boolean check(Event event) {
	PlayerArmorChangeEvent changeEvent = (PlayerArmorChangeEvent) event;
	if (slot == null)
	return true;
	EquipmentSlot changedSlot = switch (changeEvent.getSlotType()) {
	case HEAD -> EquipmentSlot.HEAD;
	case CHEST -> EquipmentSlot.CHEST;
	case LEGS -> EquipmentSlot.LEGS;
	case FEET -> EquipmentSlot.FEET;
	};
	return slot == changedSlot;
	}

While the method is deprecated, it's required to be used for older versions, so I'm not sure of a fix for this

[SlimeDog]

Not noted in sk info but this is running Java 24. Skript 2.10.2 worked fine, though.

[Fusezion]

This is caused by a change introduce in #7453, to make the event more flexible allowing additional argument parameters

[NotSoDelayed]

The user is using Spigot. How is the check method being invoked in the first place despite having a class exist check?

[SlimeDog]

The user is using Spigot. How is the check method being invoked in the first place despite having a class exist check?

Indeed. Paper 1.21.5 hasn't been released yet.

[sovdeeth]

Check is not being invoked. SlotType is needed in the class so when the class is loaded (in order to run the static block) it also attempts to load SlotType.

[sovdeeth]

@SlimeDog Can you confirm the nightly from the linked PR fixes the issue?

[SlimeDog]

@SlimeDog Can you confirm the nightly from the linked PR fixes the issue?

I will do. Please give me a link (I have tried to find it, unsuccessfully). Found it.

[SlimeDog]

The nightly build 7774 works fine on Spigot 1.21.5-4477. Thanks.