PaperMC 26.1.2 support

[mrfloris]

It's flooding console with little issues when trying to use with the papermc bluemap version for 26.1.2 and papermc 26.1.2.

[03:45:42 WARN]: [PlotMarkers] Task #1421 for PlotMarkers v2.00 generated an exception
java.lang.NullPointerException: Cannot invoke "de.bluecolored.bluemap.api.markers.MarkerSet.put(String, de.bluecolored.bluemap.api.markers.Marker)" because "markerSet" is null
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.createMarker(PoiMarkers.java:310) ~[?:?]
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.lambda$0(PoiMarkers.java:98) ~[?:?]
	at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:80) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:474) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1802) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1655) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:449) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1713) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1383) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at java.base/java.lang.Thread.run(Thread.java:1516) ~[?:?]
[03:45:42 WARN]: [PlotMarkers] Task #1421 for PlotMarkers v2.00 generated an exception
java.lang.NullPointerException: Cannot invoke "de.bluecolored.bluemap.api.markers.MarkerSet.put(String, de.bluecolored.bluemap.api.markers.Marker)" because "markerSet" is null
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.createMarker(PoiMarkers.java:310) ~[?:?]
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.lambda$0(PoiMarkers.java:98) ~[?:?]
	at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:80) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:474) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1802) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1655) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:449) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1713) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1383) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at java.base/java.lang.Thread.run(Thread.java:1516) ~[?:?]
[03:45:42 WARN]: [PlotMarkers] Task #1421 for PlotMarkers v2.00 generated an exception
java.lang.NullPointerException: Cannot invoke "de.bluecolored.bluemap.api.markers.MarkerSet.put(String, de.bluecolored.bluemap.api.markers.Marker)" because "markerSet" is null
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.createMarker(PoiMarkers.java:310) ~[?:?]
	at PlotMarkers-2.00.jar//com.bobcat00.plotmarkers.PoiMarkers.lambda$0(PoiMarkers.java:98) ~[?:?]
	at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:80) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:474) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1802) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1655) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:449) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1713) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1383) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304) ~[paper-26.1.2.jar:26.1.2-52-174eab0]
	at java.base/java.lang.Thread.run(Thread.java:1516) ~[?:?]

There are thousands.

> ver
[03:54:47 INFO]: Checking version, please wait...
[03:54:47 INFO]: This server is running Paper version 26.1.2-52-main@174eab0 (2026-04-29T08:10:12Z) (Implementing API version 26.1.2.build.52-beta)
You are running the latest version
Previous version: 1.21.11-130-c5a2736 (MC: 1.21.11)
> ver BlueMap
[03:54:51 INFO]: BlueMap version 5.20
A 3d-map of your Minecraft worlds view-able in your browser using three.js (WebGL)
Website: https://github.com/BlueMap-Minecraft
Author: Blue (TBlueF / Lukas Rieger)
> ver BlueBridgeCore
[03:54:55 INFO]: BlueBridgeCore version 2.2
Website: https://github.com/Mark-225/BlueBridge
Author: Mark_225
> ver PlotSquared
[03:54:59 INFO]: PlotSquared version 7.5.12-Premium
Easy, yet powerful Plot World generation and management.
Website: https://www.spigotmc.org/resources/77506/
Authors: Citymonstret, Empire92, MattBDev, dordsor21, NotMyFault, and SirYwell
> ver PlotMarkers
[03:55:01 INFO]: PlotMarkers version 2.00
Author: Bobcat00
>

[Bobcat00]

I've been using PlotMarkers with 26.1.2 for a while with no problems:

2026-05-01 06:51:39 [INFO] [PlotMarkers] Created 166 shape markers for plotworld.
2026-05-01 06:51:40 [INFO] [PlotMarkers] Created 226 POI markers for plotworld.
2026-05-01 06:52:15 [INFO] This server is running Paper version 26.1.2-52-main@174eab0 (2026-04-29T08:10:12Z) (Implementing API version 26.1.2.build.52-beta)
2026-05-01 06:52:22 [INFO] BlueMap version 5.20
2026-05-01 06:52:34 [INFO] PlotSquared version 7.5.12
2026-05-01 06:52:41 [INFO] PlotMarkers version 2.00

I took a look at the code and don't see anything obvious that would cause this. I assume there are no errors before the first exception. Did you get the "Created xxx markers..." messages at startup (probably not).

I'm not familiar with BlueBridge. Could you try without that plugin?

[mrfloris]

Hi! I’m seeing a startup race/error with PlotMarkers 2.00 on Paper 26.1.2.

Environment:

• Paper: 26.1.2
• Java: 25
• BlueMap: 5.20
• PlotSquared: 7.5.12
• PlotMarkers: 2.00

During startup, PlotMarkers sometimes runs before BlueMap has finished loading its map/world definitions. When that happens, worldNames appears to be null, but PlotMarkers tries to iterate it anyway:

[PlotMarkers] Task #42 for PlotMarkers v2.00 generated an exception
java.lang.NullPointerException: Cannot invoke "java.util.Set.iterator()" because "worldNames" is null
    at com.bobcat00.plotmarkers.Listeners$1.run(Listeners.java:68)

In my case the configured world is builders. BlueMap later finishes loading the builders map, and then PlotMarkers can create markers successfully:

[BlueMap] Loading map 'builders'...
[BlueMap] Loaded!
[PlotMarkers] Created 115 shape markers for builders.
[PlotMarkers] Created 362 POI markers for builders.

So this looks like a timing/startup-order issue rather than the world being permanently misconfigured. On a faster/smaller test setup it may not reproduce if BlueMap finishes before PlotMarkers’ scheduled task runs.

Possible fix: wait until BlueMap is fully loaded / map definitions are available before reading the BlueMap world names, and add a null check before iterating worldNames.

In 26.x the way worlds are stored on disk seem to be different, they are below the main world mentioned in server.properties .. so maybe this has an influence on it.

plotmarkers.log

[Bobcat00]

Possible fix: wait until BlueMap is fully loaded / map definitions are available

I already do that. BlueMap has a complicated startup sequence. I'll have to ask Blue on his Discord server if anything changed for 26.1.

The first time you use BlueMap on a new MC version, it has to download the MC .jar file, so it takes longer to initialize. But it still shouldn't try to call the PlotMarkers code until it's done.

If you want to do a quick experiment, try doing /bluemap reload a couple times and see if the problem happens sometimes and not others.

[Bobcat00]

Oh, wait a minute. Line 68 is where it gets the world names from PlotMarkers' config file. What does your config file look like?

[mrfloris]

2.00 for 1.21.11 before the upgrade:

# The date format in the icon pop-ups. See Java's SimpleDateFormat.
# Examples include MM/dd/yy, dd/MM/yy, and yy/MM/dd.
date-format: MM/dd/yy
# Markers will be created for each world listed below.
worlds:
  builders:
    # override-y causes the marker to be placed at the specified y coordinate.
    # Normally leave this true and set y to one above the ground level of your plots.
    # If set to false, the average height (y value) of each plot will be used.
    override-y: true
    y: 63
    # Specify a custom icon in the plugin folder if you don't want the default icon.
    # The anchor is which pixel on the marker-image will be placed at the marker's position.
    custom-icon: ''
    custom-icon-anchor-x: 0
    custom-icon-anchor-y: 0
    # Set the color and opacity for the fill and line areas, and the line width.
    # Color is '#rrggbb'. Opacity is 0.0 - 1.0
    fill-color: '#3388ff'
    fill-opacity: 0.1
    line-color: '#3388ff'
    line-opacity: 1.0
    line-width: 5
    # Specify a custom icon in the plugin folder if you don't want the default icon.
    # The anchor is which pixel on the marker-image will be placed at the marker's position.
    custom-icon: marker_tower_red.png
    custom-icon-anchor-x: 15
    custom-icon-anchor-y: 33

[mrfloris]

Possible fix: wait until BlueMap is fully loaded / map definitions are available

I already do that. BlueMap has a complicated startup sequence. I'll have to ask Blue on his Discord server if anything changed for 26.1.

The first time you use BlueMap on a new MC version, it has to download the MC .jar file, so it takes longer to initialize. But it still shouldn't try to call the PlotMarkers code until it's done.

If you want to do a quick experiment, try doing /bluemap reload a couple times and see if the problem happens sometimes and not others.

Thank you for the additional information and some insight.

That makes sense. One extra detail from the stack trace: the first crash may not be BlueMap calling PlotMarkers too early directly, but PlotMarkers ending up with no configured worlds yet.

The exception was:

java.lang.NullPointerException: Cannot invoke "java.util.Set.iterator()" because "worldNames" is null
    at com.bobcat00.plotmarkers.Listeners$1.run(Listeners.java:68)

So worldNames itself is null before the loop runs. This happened on a fresh Paper 26.1.2 test server after updating BlueMap/PlotSquared/Paper, where PlotMarkers had not yet generated or loaded its worlds: config section.

After startup completed, BlueMap did load the builders map, and later PlotMarkers was able to create markers successfully:

[BlueMap] Loading map 'builders'...
[BlueMap] Loaded!
[PlotMarkers] Created 115 shape markers for builders.
[PlotMarkers] Created 362 POI markers for builders.

So I think there may be two related timing/compatibility cases:

On first run after an upgrade/new MC version, BlueMap takes longer because it downloads resources.

At the moment PlotMarkers runs, plugin.config.getWorlds() can still return null / no worlds, possibly because the config has not been populated from PlotSquared yet.

A small defensive fix might be to make getWorlds() return an empty set instead of null, and possibly retry the setup if PlotSquared/BlueMap worlds are not yet available.

[Bobcat00]

I did all this 2 years ago, so I have to remember how it works.

What was your initial conditions? Fresh server, no PlotSquared config, no BlueMap config, no PlotMarkers config?

At first startup, PlotMarkers gets a list of worlds from PlotSquared and uses that to make the the PM config file. If PS wasn't configued yet, it wouldn't return any worlds, and PM would return a null Set; I can see that an empty Set would be better.

PlotMarkers is really designed so that you have a working installation of PlotSquared + BlueMap first. From the Spigot page:

You should set up PlotSquared and BlueMap to your liking first. Then add PlotMarkers to your plugins folder and restart your server. PlotMarkers will generate a config file with entries for all your PlotSquared worlds, and will automatically add a marker for each plot to your BlueMap maps. If you're happy with the default format, that's all you need to do.

I can look into handling the case where none of the three plugins have been configured. Then I'd have to delay creating the config file until PlotSquared has been set up. And then, of course, if the server owner changes the PS config while he's getting everything set, he'd also have to configure PM manually. That's why I recommend adding PM to the mix last.

So just to see if things are working for you, at this point you could stop your server, delete PlotMarkers' config file, then start your server and everything should work.

I haven't done a lot with 26.1 because FastAsyncWorldEdit still doesn't work with it. Have you tried FAWE?

[mrfloris]

cloned instance of paper 1.21.11 server, updated the jar files of the plugins, started up, and let it migrate worlds, and when done /stop and started it again. errors on both 26.1.2 paper runs.
no using worldedit, the fawe has no 26.x jars as far as i know

[Bobcat00]

So all three plugins were already working under 1.21.11? I did the same thing several times, with no problems.

10 PM here. I'll look at it further over the weekend.

[mrfloris]

I will soon have another set of updates for jar files, so i will get a fresh clone from the live server and give things another test, maybe it's a fluke or something

[Bobcat00]

I sent a test version on Discord, because GitHub won't let me attach a .jar file.