`java.lang.NoSuchFieldError: Class net.minecraft.server.MinecraftServer does not have member field 'net.minecraft.commands.Commands vanillaCommandDispatcher'` after upgrading to Paper-1.20.6-b68

[globau]

CommandAPI version

9.4.0

Minecraft version

1.20.6

Are you shading the CommandAPI?

Yes

What I did

• upgraded from Paper-1.20.6-b62 to Paper-1.20.6-b68

What actually happened

All plugins using CommaAPI fail to load

What should have happened

Business as usual

Server logs and CommandAPI config

java.lang.NoSuchFieldError: Class net.minecraft.server.MinecraftServer does not have member field 'net.minecraft.commands.Commands vanillaCommandDispatcher'
        at ClodMC.jar/shadow.dev.jorel.commandapi.nms.NMS_Common.getBrigadierDispatcher(NMS_Common.java:353) ~[ClodMC.jar:?]
        at ClodMC.jar/shadow.dev.jorel.commandapi.CommandAPIBukkit.registerCommandNode(CommandAPIBukkit.java:641) ~[ClodMC.jar:?]
        at ClodMC.jar/shadow.dev.jorel.commandapi.CommandAPIHandler.register(CommandAPIHandler.java:647) ~[ClodMC.jar:?]
        at ClodMC.jar/shadow.dev.jorel.commandapi.AbstractCommandAPICommand.register(AbstractCommandAPICommand.java:307) ~[ClodMC.jar:?]
        at ClodMC.jar/shadow.dev.jorel.commandapi.CommandAPICommand.register(CommandAPICommand.java:60) ~[ClodMC.jar:?]
        at ClodMC.jar/shadow.dev.jorel.commandapi.ExecutableCommand.register(ExecutableCommand.java:236) ~[ClodMC.jar:?]
        …

Other

Downgrading to Paper-1.20.6-b62 fixed the issue.

Probably caused by https://github.com/PaperMC/Paper/pull/8235

ps. your issue template doesn't have mc v1.20.6.

[DerEchtePilz]

Yeah, definitely caused by Paper‘s Brigadier PR; until we have a (hot)fix it might be best to stay on build 64

[DerEchtePilz]

@globau Just to clarify, when you load a plugin using the CommandAPI on a Paper server with the Paper Brigadier command API, does the plugin actually get disabled?

[Sytm]

One of my users also ran into this problem. This is the full exception: https://pastes.dev/JDnzZIMiXs As you can see my plugin is also disabled because of this (if this is what you meant)

[DerEchtePilz]

One of my users also ran into this problem. This is the full exception: https://pastes.dev/JDnzZIMiXs As you can see my plugin is also disabled because of this (if this is what you meant)

Thanks! I currently have a hotfix on dev/paper-hotfix (PR #555) if you want to check it out. Just waiting on approval and/or feedback but it should work.

[DerEchtePilz]

This is now hotfixed in snapshot version 9.5.0-SNAPSHOT It will take a while for it to deploy but once it is deployed, this issue is hotfixed.

[frengor]

Any plans on when 9.5.0 will be released? We're currently waiting for this to be fixed before releasing the new version of UltimateAdvancementAPI.

(no need to hurry, just to know, hope it isn't a month :skull:)

[DerEchtePilz]

@frengor Yeah, if released it probably will rather be 9.4.2 but @JorelAli is currently on a break so it might take until the end of the month.

[JorelAli]

Hotfix has been published to CommandAPI 9.4.2. For all intents and purposes, this should now be fixed for paper builds 64+