java.lang.NoClassDefFoundError: org.fusesource.jansi.Ansi #348

Terms

• I'm using the very latest version of CosmeticsCore and its dependencies.
• I already searched on this Github page to check if the same issue was already reported.
• I already searched on the plugin wiki to know if a solution is already known.
• I already searched on the Discord server to know if anyone already provided a solution in the past for the issue.

Discord tag (optional)

No response

What happened?

CosmeticsCore throws a java.lang.NoClassDefFoundError: org.fusesource.jansi.Ansi error during server startup and fails to start.

Steps to reproduce the issue

The server throws an error even when started with a clean configuration and only the CosmeticsCore dependencies installed
(Installed plugins on the server: CosmeticsCore, PlaceholderAPI, ProtocolLib).

Server version

Paper version 1.21.8-60-main@29c8822

CosmeticsCore Version

CosmeticsCore version 1.3.9
Author: LoneDev

ProtocolLib Version

ProtocolLib version 5.4.1-SNAPSHOT-468082c
Provides read/write access to the Minecraft protocol.
Authors: dmulloy2, and comphenix

FULL server log

[16:21:48] [ServerMain/INFO]: [bootstrap] Running Java 24 (Java HotSpot(TM) 64-Bit Server VM 24.0.1+9-jvmci-b01; Oracle Corporation Oracle GraalVM 24.0.1+9.1) on Windows 11 10.0 (amd64)
[16:21:48] [ServerMain/INFO]: [bootstrap] Loading Paper 1.21.8-60-main@29c8822 (2025-09-06T21:49:13Z) for Minecraft 1.21.8
[16:21:49] [ServerMain/INFO]: [PluginInitializerManager] Initializing plugins...
[16:21:49] [ServerMain/INFO]: [PluginInitializerManager] Initialized 3 plugins
[16:21:49] [ServerMain/INFO]: [PluginInitializerManager] Bukkit plugins (3):

• CosmeticsCore (1.3.9), PlaceholderAPI (2.11.6), ProtocolLib (5.4.1-SNAPSHOT-468082c)
  [16:21:52] [ServerMain/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, name=PROD]
  [16:21:52] [ServerMain/INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Initialising converters for DataConverter...
  [16:21:52] [ServerMain/INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Finished initialising converters for DataConverter in 249.3ms
  [16:21:54] [ServerMain/INFO]: Loaded 1407 recipes
  [16:21:54] [ServerMain/INFO]: Loaded 0 advancements
  [16:21:54] [Server thread/INFO]: Starting minecraft server version 1.21.8
  [16:21:54] [Server thread/INFO]: Loading properties
  [16:21:54] [Server thread/INFO]: This server is running Paper version 1.21.8-60-main@29c8822 (2025-09-06T21:49:13Z) (Implementing API version 1.21.8-R0.1-SNAPSHOT)
  [16:21:54] [Server thread/INFO]: [spark] This server bundles the spark profiler. For more information please visit https://docs.papermc.io/paper/profiling
  [16:21:54] [Server thread/INFO]: Server Ping Player Sample Count: 12
  [16:21:54] [Server thread/INFO]: Using 8 threads for Netty based IO
  [16:21:54] [Server thread/INFO]: [MoonriseCommon] Paper is using 5 worker threads, 1 I/O threads
  [16:21:54] [Server thread/INFO]: [ChunkTaskScheduler] Chunk system is using population gen parallelism: true
  [16:21:54] [Server thread/INFO]: Default game type: SURVIVAL
  [16:21:54] [Server thread/INFO]: Generating keypair
  [16:21:54] [Server thread/INFO]: Starting Minecraft server on *:36843
  [16:21:54] [Server thread/INFO]: Using default channel type
  [16:21:54] [Server thread/INFO]: Paper: Using Java compression from Velocity.
  [16:21:54] [Server thread/INFO]: Paper: Using Java cipher from Velocity.
  [16:21:55] [Server thread/INFO]: [ProtocolLib] Loading server plugin ProtocolLib v5.4.1-SNAPSHOT-468082c
  [16:21:55] [Server thread/INFO]: [PlaceholderAPI] Loading server plugin PlaceholderAPI v2.11.6
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading server plugin CosmeticsCore v1.3.9
  [16:21:55] [Server thread/INFO]: Server permissions file permissions.yml is empty, ignoring it
  [16:21:55] [Server thread/INFO]: [ProtocolLib] Enabling ProtocolLib v5.4.1-SNAPSHOT-468082c
  [16:21:55] [Server thread/WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
  [16:21:55] [Server thread/WARN]: The server will make no attempt to authenticate usernames. Beware.
  [16:21:55] [Server thread/WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
  [16:21:55] [Server thread/WARN]: To change this, set "online-mode" to "true" in the server.properties file.
  [16:21:55] [Server thread/INFO]: Preparing level "towny"
  [16:21:55] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
  [16:21:55] [Server thread/INFO]: Time elapsed: 3 ms
  [16:21:55] [Server thread/INFO]: Preparing start region for dimension minecraft:the_nether
  [16:21:55] [Server thread/INFO]: Time elapsed: 2 ms
  [16:21:55] [Server thread/INFO]: [PlaceholderAPI] Enabling PlaceholderAPI v2.11.6
  [16:21:55] [Server thread/INFO]: [PlaceholderAPI] Fetching available expansion information...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Enabling CosmeticsCore v1.3.9
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library FastNbt-jar (remapped)...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library commons-math3...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-api...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-key
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-string
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-minimessage...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-key
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-string
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-gson...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-json
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-key
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-string
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library option
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library jspecify
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library gson
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library auto-service-annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-commons
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-gson-legacy-impl...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-gson
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-json
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library option
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library jspecify
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library gson
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library auto-service-annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-commons
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-json-legacy-impl
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-key
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-string
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-nbt
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-platform-bukkit...
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-platform-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-key
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-bungeecord
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-legacy
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-nbt
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-api
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library examination-string
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-gson
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-json
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library option
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library jspecify
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library auto-service-annotations
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-commons
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-gson-legacy-impl
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-text-serializer-json-legacy-impl
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-platform-facet
  [16:21:55] [Server thread/INFO]: [CosmeticsCore] Loading library adventure-platform-viaversion
  [16:21:56] [Server thread/ERROR]: Error occurred while enabling CosmeticsCore v1.3.9 (Is it up to date?)
  java.lang.NoClassDefFoundError: org/fusesource/jansi/Ansi
  at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.en.(SourceFile:26) ~[CosmeticsCore_1.3.9.jar:?]
  at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.ex.(SourceFile:16) ~[CosmeticsCore_1.3.9.jar:?]
  at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.s.u(SourceFile:240) ~[CosmeticsCore_1.3.9.jar:?]
  at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.s.s(SourceFile:103) ~[CosmeticsCore_1.3.9.jar:?]
  at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.Main.onEnable(SourceFile:87) ~[CosmeticsCore_1.3.9.jar:?]
  at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:280) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
  at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
  at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:652) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:608) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:743) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:488) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:280) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1164) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
  at java.base/java.lang.Thread.run(Thread.java:1447) ~[?:?]
  Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.Ansi
  at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:205) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
  at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:172) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
  ... 17 more
  [16:21:56] [Server thread/INFO]: [CosmeticsCore] Disabling CosmeticsCore v1.3.9
  [16:21:56] [Server thread/INFO]: [PlaceholderAPI] Placeholder expansion registration initializing...
  [16:21:56] [Server thread/INFO]: Done preparing level "towny" (0.907s)
  [16:21:56] [Server thread/INFO]: Running delayed init tasks
  [16:21:56] [Server thread/INFO]: Done (8.176s)! For help, type "help"
  [16:21:56] [Server thread/INFO]: [PlaceholderAPI] Successfully registered external expansion: player [2.0.8]
  [16:21:56] [Server thread/INFO]: [PlaceholderAPI] Successfully registered external expansion: server [2.6.2]
  [16:21:56] [Server thread/INFO]: [PlaceholderAPI] Successfully registered external expansion: statistic [2.0.1]
  [16:21:56] [Server thread/INFO]: 3 placeholder hook(s) registered! 3 placeholder hook(s) have an update available.

Error (optional)

[16:21:56] [Server thread/ERROR]: Error occurred while enabling CosmeticsCore v1.3.9 (Is it up to date?)
java.lang.NoClassDefFoundError: org/fusesource/jansi/Ansi
	at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.en.<clinit>(SourceFile:26) ~[CosmeticsCore_1.3.9.jar:?]
	at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.ex.<clinit>(SourceFile:16) ~[CosmeticsCore_1.3.9.jar:?]
	at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.s.u(SourceFile:240) ~[CosmeticsCore_1.3.9.jar:?]
	at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.s.s(SourceFile:103) ~[CosmeticsCore_1.3.9.jar:?]
	at CosmeticsCore_1.3.9.jar/dev.lone.cosmeticscore.Main.onEnable(SourceFile:87) ~[CosmeticsCore_1.3.9.jar:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:280) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:652) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:608) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:743) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:488) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:280) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1164) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.8.jar:1.21.8-60-29c8822]
	at java.base/java.lang.Thread.run(Thread.java:1447) ~[?:?]
Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.Ansi
	at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:205) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:172) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ~[?:?]
	... 17 more
[16:21:56] [Server thread/INFO]: [CosmeticsCore] Disabling CosmeticsCore v1.3.9

CosmeticsCore config.yml

lang: en
prefix: ''
extract_default_assets: true
cosmetics:
  max_equippable:
    body: 1
    balloon: 1
  hide_during_combat:
    enabled: true
    combat_duration_ticks: 600
    only_pvp: true
  fix_invisible_nametag: false
  hide_in_vanish: true
  worlds:
  - '*'
wardrobe_room:
  allow-not-owned-preview: true
  camera:
    hide_actionbar_texts: true
    rotation:
      manual:
        enabled: true
        step: 20
      auto:
        enabled: true
        direction: RIGHT
        step: 1.5
        pause_ticks_on_manual_rotation: 60
    zoom:
      enabled: true
      min: 2
    fade_effect: true
    location:
      world: world
      x: -66.0
      y: 75.3
      z: -1.0
      yaw: 90.0
      pitch: 0.0
    use_invisibility_potion: false
  mannequin:
    location:
      world: world
      x: -70.0
      y: 74.0
      z: -1.0
      yaw: -90.0
      pitch: 0.0
  teleport_area:
    enter:
      world: world
      pos1:
        x: -58.0
        y: 74.0
        z: 2.0
      pos2:
        x: -58.0
        y: 80.0
        z: -5.0
    exit_location:
      world: world
      x: -53.5
      y: 74.0
      z: -1.0
      yaw: -90.0
      pitch: 0.0
  gui:
    cursor_default: fermented_spider_eye:9000001
    cursor_rotate: fermented_spider_eye:9000002
    cursor_pointer: fermented_spider_eye:9000003
    dyeing_pointer: fermented_spider_eye:9100003
    tutorial_gui: fermented_spider_eye:9100004
    tutorial_gui_checked: fermented_spider_eye:9100005
    slots:
      colors:
        not_owned: 195,147,57
        owned: 56,67,100
        wearing: 57,70,195
        wearing_preview: 195,120,57
        max_amount_reached_owned: 24, 29, 43
        max_amount_reached_not_owned: 64, 48, 17
      add_item_in_blank_slots:
        # This is useful only for some expert users that need to do some crazy stuff.
        # Do not enable it if you don't know what you are doing.
        enabled: false
        type: PAPER
        custom_model_data: 1337666
  commands:
    whitelist:
      enabled: false
      list:
      - home
      - sethome
    blacklist:
      enabled: false
      list:
      - home
      - sethome
send_creative_hidden_hat_message: false
save:
  file:
    enabled: true
  mysql:
    enabled: false
    url: jdbc:mysql://my_url_database_69.com:3306/database_name
    username: username
    password: password
    table: cosmeticscore_saved
debug: false

Problematic items yml configuration file (optional)

Other files, you can drag and drop them here to upload. (optional)

No response

Screenshots/Videos (you can drag and drop files or paste links)

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