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PaperMC

24 indexed repositories · View on GitHub

Paper
The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

Java · 12663 stars
Folia
Fork of Paper which adds regionised multithreading to the dedicated server.

Shell · 4369 stars
Velocity
The modern, next-generation Minecraft server proxy.

Java · 2259 stars
adventure
A user-interface library for Minecraft: Java Edition

Java · 887 stars
Waterfall
BungeeCord fork that aims to improve performance and stability.

Shell · 752 stars
paperweight
Gradle build system plugin for Paper and Paper forks

Kotlin · 317 stars
Paperclip
Bootstrap utility and launcher for the Paper Minecraft server

Java · 126 stars
adventure-platform-mod
An adapter for adventure to integrate with Fabric and NeoForge

Java · 81 stars
DataConverter
Rewrite of the dataconverter system for performance.

Java · 75 stars
docs
Documentation for all projects under the PaperMC umbrella.

MDX · 73 stars
website
The PaperMC website

MDX · 62 stars
mache
Compilable patches for the decompiled Minecraft server

59 stars
diff-viewer
Featureful and performant web-based diff viewer

TypeScript · 50 stars
adventure-webui
A web UI for Adventure

Kotlin · 47 stars
tack
Paper server launcher with AOT cache management.

Rust · 26 stars
codebook
Library for handling jar remaping logic for PaperMC

Java · 24 stars
asm-utils
Library for redirecting Java bytecode & reflection calls using ASM

Java · 18 stars
fill

Java · 10 stars
patch-roulette
Management tool for updating Paper

TypeScript · 7 stars
update-projects-action

TypeScript · 4 stars
4 more repositories live on View on GitHub

Beginner friendly Everything

Open All

@KeyPattern regex broke due to update to @KeyPattern.Namespace regex Open

area: key type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

PaperMC/adventure#1435 · Opened Jul 19, 2026
Invalid cross-device link when world migration starts (ZFS with a dataset for the dimension targeted) Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#14078 · 1 comment · 1 reaction · Opened Jul 18, 2026
Javadoc button in software is hidden for mobile Open

type: bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

PaperMC/website#346 · Opened Jul 18, 2026
Throwing exception in custom arg before signed arg causes mismatch Open

status: accepted version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 55/100

PaperMC/Paper#14076 · 1 reaction · Opened Jul 17, 2026
Paper refuses to start after deleting `world_gen_settings.dat` file Open

status: accepted version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#14066 · 2 comments · 2 reactions · Opened Jul 14, 2026
PlayerTeleportEvent#setCancelled(true) does not cancel when spectating entity Open

status: needs triage version: 26.1.2

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PaperMC/Paper#14065 · 4 comments · Opened Jul 14, 2026
java.nio.file.AtomicMoveNotSupportedException during world storage migration not handled Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 58/100

PaperMC/Paper#14059 · 4 comments · 1 reaction · Opened Jul 13, 2026
Server crash - ConcurrentModificationException at ServerDebugSubscribers.tick (1.21.11) Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PaperMC/Folia#472 · Opened Jul 12, 2026
Adding valueless tags to PersistentDataContainer Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#14053 · Opened Jul 12, 2026
Wandering Trader leash desync when re-entering tracking distance Open

status: accepted version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PaperMC/Paper#14049 · Opened Jul 10, 2026
openpty UnsatisfiedLinkError during startup Open

status: needs triage version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PaperMC/Paper#14046 · 16 comments · Opened Jul 9, 2026
BlockBreakEvent missfires when player in adventure mode switches item in a last tick Open

status: needs triage version: 26.1.2

Difficulty 3/5 1-2 days Newbie friendliness 45/100

PaperMC/Paper#14042 · 1 comment · Opened Jul 8, 2026
Add event to account for items being ejected from item frames Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#14041 · Opened Jul 7, 2026
[Feature Request]Proposal: Add a stable connection identifier accessible across all login-phase events Open

type: feature

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PaperMC/Velocity#1839 · 2 comments · Opened Jul 6, 2026
NoSuchMethodError for (removed adventure) Book interface's setter Open

status: needs triage version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 47/100

PaperMC/Paper#14030 · 6 comments · Opened Jul 4, 2026
Expose server API version along with helper methods Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#14015 · 7 comments · Opened Jun 30, 2026
mention how to disable watchdog and client timeouts on debugging page Open

Difficulty 1/5 Under an hour Newbie friendliness 75/100

PaperMC/docs#777 · Opened Jun 29, 2026
World Clock API Open

scope: api status: accepted

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#14007 · 1 comment · Opened Jun 29, 2026
Bundled mysql-connector-j protobuf causes OpenTelemetry incompatibility Open

status: needs triage version: 26.1.2

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PaperMC/Paper#13996 · 1 comment · Opened Jun 28, 2026
Detected unsafe terrain read during worldgen in 26.2 (MC-307918) Open

status: needs triage upstream: vanilla version: 26.2

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PaperMC/Paper#13995 · 2 comments · 3 reactions · Opened Jun 28, 2026
PlayerInventorySlotChangeEvent#getSlot() returns misleading slot when armor changes while another inventory is open` Open

status: needs triage version: 26.1.2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#13991 · Opened Jun 26, 2026
Network protocol error when player is kicked during configuration Open

type: bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PaperMC/Velocity#1832 · 5 comments · Opened Jun 26, 2026
PaperMC snapshots repository returns corrupt artifacts Open

resolution: cannot reproduce

Difficulty 4/5 3-5 days Newbie friendliness 35/100

PaperMC/Paper#13987 · 6 comments · Opened Jun 24, 2026
Change the license header to use SPDX abbreviations Open

type: feature

Difficulty 4/5 3-5 days Newbie friendliness 52/100

PaperMC/Velocity#1829 · 1 reaction · Opened Jun 23, 2026
supportsForge disables packet ID range check — out-of-range IDs cause AIOOBE; EntityMap off-by-one Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

PaperMC/Waterfall#872 · Opened Jun 23, 2026
GS4 query handler throws on short/malformed datagrams instead of dropping them Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

PaperMC/Velocity#1828 · Opened Jun 23, 2026
Offline-mode login accepts arbitrary Unicode in username — no charset validation Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

PaperMC/Velocity#1827 · 1 comment · Opened Jun 23, 2026
Dependency Dashboard Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

PaperMC/adventurex#4 · Opened Jun 21, 2026
Ambiguity in LivingEntity.getRemoveWhenFarAway() documentation Open

status: accepted version: 26.2

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PaperMC/Paper#13980 · 4 comments · Opened Jun 21, 2026
Ambiguity in Mob.getTarget() functionality Open

status: needs triage version: 26.2

Difficulty 3/5 1-2 days Newbie friendliness 52/100

PaperMC/Paper#13979 · 2 comments · Opened Jun 21, 2026
Note blocks do not respond to redstone and pitch never changes on player interaction Open

status: needs triage type: bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Folia#470 · 2 comments · Opened Jun 18, 2026
Option to couple Nether-Overworld portal-linked regions to the same thread Open

status: needs triage type: feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

PaperMC/Folia#469 · Opened Jun 15, 2026
Soul Speed effect persists after boots break when swapping between two pairs on soul sand Open

status: accepted upstream: vanilla version: 26.1.2

Difficulty 3/5 1-2 days Newbie friendliness 68/100

PaperMC/Paper#13958 · 2 comments · Opened Jun 14, 2026
Auto upstream update? Open

status: needs triage type: feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

PaperMC/Folia#468 · 2 comments · 2 reactions · Opened Jun 11, 2026
`read-timeout` is too high, effectively does nothing in some scenarios Open

type: bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

PaperMC/Velocity#1819 · 1 comment · Opened Jun 2, 2026
Expose a stable connection ID across motd, handshake, login and join events Open

scope: api status: accepted

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#13921 · 1 comment · 3 reactions · Opened May 31, 2026
--forceUpgrade removed/not implemented in 26.1 Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 25/100

PaperMC/Paper#13920 · 3 comments · Opened May 31, 2026
BossBar Changes Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

PaperMC/adventure#1426 · 1 comment · Opened May 29, 2026
Tag resolvers should hint at tag type to avoid multiple calls Open

area: text-minimessage type: enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/adventure#1424 · 1 comment · 3 reactions · Opened May 28, 2026
Save level.dat asynchronously on the I/O thread to avoid blocking the server thread Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#13902 · 5 comments · Opened May 22, 2026
Add GrindstoneItemEvent Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#13900 · Opened May 21, 2026
Keys for feature seeds in world configs do not migrate from 1.21.11 to 26.1.2 properly Open

status: accepted version: 26.1.2

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PaperMC/Paper#13899 · 4 comments · Opened May 21, 2026
PlayerInteractEvent is not triggered when entity_interaction_range is increased Open

status: needs triage

Difficulty 3/5 1-2 days Newbie friendliness 58/100

PaperMC/Paper#13895 · Opened May 19, 2026
How about adding dialog box support? Open

type: feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

PaperMC/Velocity#1795 · 1 comment · 2 reactions · Opened May 19, 2026
level-name in server.properties not being input sanitized Open

status: needs triage upstream: vanilla version: 26.1.2

Difficulty 3/5 1-2 days Newbie friendliness 48/100

PaperMC/Paper#13893 · 2 comments · Opened May 18, 2026
Add SpearChargeDismountEvent Open

status: needs triage

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#13883 · 2 comments · Opened May 14, 2026
Configurable Lava Level Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 45/100

PaperMC/Paper#13878 · 4 comments · Opened May 11, 2026
Mismatched encoding between console and texts got printed results in garbled texts Open

status: needs triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

PaperMC/Paper#13865 · Opened May 6, 2026
Flush memory caches to disk when server is paused (empty-server pause) Open

scope: configuration status: accepted

Difficulty 5/5 Over a week Newbie friendliness 38/100

PaperMC/Paper#13864 · 2 comments · 2 reactions · Opened May 5, 2026
Server crash starting spark background profiler Open

status: needs triage version: 26.1.2

Difficulty 4/5 3-5 days Newbie friendliness 48/100

PaperMC/Paper#13862 · 5 comments · Opened May 5, 2026

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