Paste #136436: java.lang.NoClassDefFoundError: net/minecraft/world/level/World (Citizens2 Plugin Only)

Date: 2025/10/03 23:53:02 UTC-07:00
Type: Server Log

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❯ ./start.sh 
Listening for transport dt_socket at address: 5005
HOTSWAP AGENT: 16:51:56.053 INFO (org.hotswap.agent.HotswapAgent) - Loading Hotswap agent {2.0.1} - unlimited runtime class redefinition.
HOTSWAP AGENT: 16:51:56.450 INFO (org.hotswap.agent.config.PluginRegistry) - Discovered plugins: [WatchResources, AnonymousClassPatch, Hotswapper, JdkPlugin, Hibernate, HibernateJakarta, Hibernate3, Hibernate3JPA, Spring, SpringBoot, Jersey1, Jersey2, Jetty, Tomcat, ZK, Logback, MyFaces, Mojarra, Omnifaces, ELResolver, WildFlyELResolver, OsgiEquinox, Owb, OwbJakarta, WebObjects, Weld, WeldJakarta, JBossModules, ResteasyRegistry, Deltaspike, DeltaspikeJakarta, GlassFish, Weblogic, Vaadin, Wicket, CxfJAXRS, FreeMarker, Undertow, MyBatis, MyBatisPlus, IBatis, Idea, Thymeleaf, Velocity, Sponge]
Starting org.bukkit.craftbukkit.Main
2025-10-04T06:51:58.799527236Z ServerMain WARN Advanced terminal features are not available in this environment
[16:51:59 INFO]: [bootstrap] Running Java 21 (OpenJDK 64-Bit Server VM 21.0.7+9-b982.16; JetBrains s.r.o. JBR-21.0.7+9-982.16-jcef) on Linux 6.16.8-111.desktop (amd64)
[16:51:59 INFO]: [bootstrap] Loading Paper 1.21.9-47-main@21b4930 (2025-10-03T18:17:01Z) for Minecraft 1.21.9
[16:51:59 INFO]: [PluginInitializerManager] Initializing plugins...
[16:52:00 INFO]: [PluginInitializerManager] Initialized 1 plugin
[16:52:00 INFO]: [PluginInitializerManager] Bukkit plugins (1):
 - Citizens (2.0.39-SNAPSHOT (build 3891))
[16:52:08 INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[16:52:11 INFO]: Loaded 1461 recipes
[16:52:11 INFO]: Loaded 1574 advancements
[16:52:11 INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Initialising converters for DataConverter...
[16:52:12 INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Finished initialising converters for DataConverter in 825.0ms
[16:52:12 INFO]: Starting minecraft server version 1.21.9
[16:52:12 INFO]: Loading properties
[16:52:12 INFO]: This server is running Paper version 1.21.9-47-main@21b4930 (2025-10-03T18:17:01Z) (Implementing API version 1.21.9-R0.1-SNAPSHOT)
[16:52:12 INFO]: [spark] This server bundles the spark profiler. For more information please visit https://docs.papermc.io/paper/profiling
[16:52:12 INFO]: Server Ping Player Sample Count: 12
[16:52:12 INFO]: Using 4 threads for Netty based IO
[16:52:13 INFO]: [MoonriseCommon] Paper is using 2 worker threads, 1 I/O threads
[16:52:13 INFO]: Default game type: SURVIVAL
[16:52:13 INFO]: Generating keypair
[16:52:13 INFO]: Starting Minecraft server on *:25565
[16:52:13 INFO]: Using epoll channel type
[16:52:13 INFO]: Paper: Using libdeflate (Linux x86_64) compression from Velocity.
[16:52:13 INFO]: Paper: Using OpenSSL 3.x.x (Linux x86_64) cipher from Velocity.
[16:52:13 INFO]: [SpigotLibraryLoader] [Citizens] Loading 3 libraries... please wait
[16:52:14 INFO]: [SpigotLibraryLoader] [Citizens] Loaded library /home/sammy/Documents/Code/MCJE-PlayerQuests-Plugin/test-server/libraries/ch/ethz/globis/phtree/phtree/2.8.2/phtree-2.8.2.jar
[16:52:14 INFO]: [SpigotLibraryLoader] [Citizens] Loaded library /home/sammy/Documents/Code/MCJE-PlayerQuests-Plugin/test-server/libraries/org/joml/joml/1.10.8/joml-1.10.8.jar
[16:52:14 INFO]: [SpigotLibraryLoader] [Citizens] Loaded library /home/sammy/Documents/Code/MCJE-PlayerQuests-Plugin/test-server/libraries/it/unimi/dsi/fastutil/8.5.15/fastutil-8.5.15.jar
[16:52:14 INFO]: [Citizens] Loading server plugin Citizens v2.0.39-SNAPSHOT (build 3891)
[16:52:14 INFO]: Server permissions file permissions.yml is empty, ignoring it
[16:52:14 INFO]: Preparing level "world"
[16:52:15 INFO]: Loading 0 persistent chunks for world 'minecraft:overworld'...
[16:52:15 INFO]: Preparing spawn area: 100%
[16:52:15 INFO]: Prepared spawn area in 1 ms
[16:52:15 INFO]: Loading 0 persistent chunks for world 'minecraft:the_nether'...
[16:52:15 INFO]: Prepared spawn area in 0 ms
[16:52:15 INFO]: Loading 0 persistent chunks for world 'minecraft:the_end'...
[16:52:15 INFO]: Prepared spawn area in 0 ms
[16:52:15 INFO]: Done preparing level "world" (1.035s)
[16:52:15 INFO]: [Citizens] Enabling Citizens v2.0.39-SNAPSHOT (build 3891)
[16:52:16 INFO]: [Citizens] Using mojmapped server, avoiding server package checks
[16:52:16 ERROR]: Error occurred while enabling Citizens v2.0.39-SNAPSHOT (build 3891) (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/world/level/World
    at java.base/java.lang.Class.forName0(Native Method) ~[?:?]
    at java.base/java.lang.Class.forName(Class.java:534) ~[?:?]
    at java.base/java.lang.Class.forName(Class.java:513) ~[?:?]
    at io.papermc.reflectionrewriter.runtime.AbstractDefaultRulesReflectionProxy.forName(AbstractDefaultRulesReflectionProxy.java:68) ~[reflection-rewriter-runtime-0.0.3.jar:?]
    at io.papermc.paper.pluginremap.reflect.PaperReflectionHolder.forName(Unknown Source) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at Citizens-2.0.39-b3891.jar/net.citizensnpcs.api.util.SpigotUtil.lambda$getMinecraftPackage$1(SpigotUtil.java:174) ~[Citizens-2.0.39-b3891.jar:?]
    at Citizens-2.0.39-b3891.jar/net.citizensnpcs.api.util.SpigotUtil.getMinecraftPackage(SpigotUtil.java:179) ~[Citizens-2.0.39-b3891.jar:?]
    at Citizens-2.0.39-b3891.jar/net.citizensnpcs.Citizens.onEnable(Citizens.java:377) ~[Citizens-2.0.39-b3891.jar:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-1.21.9-R0.1-SNAPSHOT.jar:?]
    at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.9-R0.1-SNAPSHOT.jar:?]
    at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:639) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:595) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:554) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:368) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1096) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:317) ~[paper-1.21.9.jar:1.21.9-47-21b4930]
    at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.level.World
    at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:208) ~[paper-api-1.21.9-R0.1-SNAPSHOT.jar:?]
    at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:175) ~[paper-api-1.21.9-R0.1-SNAPSHOT.jar:?]
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
    ... 19 more
[16:52:16 INFO]: [Citizens] Disabling Citizens v2.0.39-SNAPSHOT (build 3891)
[16:52:16 INFO]: [spark] Starting background profiler...
[16:52:17 INFO]: Running delayed init tasks
[16:52:17 INFO]: Done (19.284s)! For help, type "help"