Minecraft plugin NoClassDefFoundError

Question

I am trying to create plugin for Minecraft, so it can comunicate with Discord. I tried using JDA library for it. But when i reference it, it will throw this error:

[07:13:17] [Server thread/ERROR]: Error occurred while enabling MinecraftDiscordBot v1.0 (Is it up to date?)
java.lang.NoClassDefFoundError: net/dv8tion/jda/api/JDABuilder
        at notURL.RedstoneExpert.MinecraftDiscordBot.Main.discordLogin(Main.java:24) ~[?:?]
        at notURL.RedstoneExpert.MinecraftDiscordBot.Main.onEnable(Main.java:14) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:352) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:461) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:375) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:449) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:266) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:775) [spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
Caused by: java.lang.ClassNotFoundException: net.dv8tion.jda.api.JDABuilder
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_231]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:135) ~[spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:81) ~[spigot-1.14.4.jar:git-Spigot-cbd1a1b-009d8af]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_231]
        ... 11 more

Can you help me?

Did you compile against the library but not actually bother to add it to the Minecraft instance? You do need it at runtime too. — Joseph Sible-Reinstate Monica, May 17 '20 at 06:01
@JosephSible-ReinstateMonica How to do it? I am really noob at this. (I am using eclipse to make the plugin.) — doc. Chocholoušek, May 17 '20 at 06:32
https://www.minecraftforge.net/forum/topic/37528-using-external-libraries-in-my-mod/ — Joseph Sible-Reinstate Monica, May 17 '20 at 16:40
@JosephSible-ReinstateMonica I was trying it for long time, but nope. — doc. Chocholoušek, May 18 '20 at 08:07
Some cool discord user gave me this [link](https://stackoverflow.com/a/1729094/13157141) and it solved the problem. — doc. Chocholoušek, May 21 '20 at 09:19

doc. Chocholoušek · Answer 1 · 2020-12-25T21:00:15.463

0

I solved it, the JDA library wasn't exported with the plugin, so I used the maven assembly plugin. It is best to use intellij idea insted of eclipse, because you can easily select what dependency you want to export.

edited Dec 25 '20 at 21:00

answered May 17 '20 at 18:03

doc. Chocholoušek

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Minecraft plugin NoClassDefFoundError

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