java.lang.NoClassDefFoundError: org.fusesource.jansi.Ansi #348
Description
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 v1.3.9CosmeticsCore 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: falseProblematic 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)
No response