Incompatibility with newer SnakeYAML (Paper 26.1.2)

[Hurming]

Hello,

I'm encountering an issue while enabling skript-yaml (v1.7.2) on a modern Paper server (Minecraft 1.21). The plugin throws the following error during startup:

[10:56:42 INFO]: [skript-yaml] Enabling skript-yaml v1.7.2
[10:56:42 WARN]: java.lang.NoSuchMethodException: org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(org.yaml.snakeyaml.nodes.Tag,java.util.Map,java.lang.Boolean)
[10:56:42 WARN]:        at java.base/java.lang.Class.getDeclaredMethod(Class.java:2422)
[10:56:42 WARN]:        at Skript-Yaml-1.7.2.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.<clinit>(SkriptYamlRepresenter.java:39)
[10:56:42 WARN]:        at Skript-Yaml-1.7.2.jar//me.sashie.skriptyaml.SkriptYaml.onEnable(SkriptYaml.java:136)
[10:56:42 WARN]:        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279)
[10:56:42 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:207)
[10:56:42 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109)
[10:56:42 WARN]:        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520)
[10:56:42 WARN]:        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:637)
[10:56:42 WARN]:        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:594)
[10:56:42 WARN]:        at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:680)
[10:56:42 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:386)
[10:56:42 WARN]:        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1301)
[10:56:42 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304)
[10:56:42 WARN]:        at java.base/java.lang.Thread.run(Thread.java:1474)

java.lang.NoSuchMethodException: org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(org.yaml.snakeyaml.nodes.Tag, java.util.Map, java.lang.Boolean)

It appears that this is caused by changes in the SnakeYAML API used in newer server versions, which makes skript-yaml incompatible.

Steps to reproduce:

1. Install skript-yaml v1.7.2
2. Run server on Paper (26.1.2)
3. Start the server

Expected behavior:
Plugin should enable without errors.

Actual behavior:
Plugin fails to initialize due to missing method in SnakeYAML.

Additional information:
This seems related to outdated SnakeYAML method usage. Possibly requires updating to newer API.

Could you please look into updating the plugin for compatibility with newer Minecraft/Paper versions?
Thanks in advance.

[ILikeOrangeJuice]

Can confirm, got the same error.

[MinecraftMan1013number2]

I get a different error also relating to SnakeYAML.

29.05 11:31:19 [Server] INFO [skript-yaml] Enabling skript-yaml v1.7.2
29.05 11:31:19 [Server] WARN java.lang.NoSuchMethodException: org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(org.yaml.snakeyaml.nodes.Tag,java.util.Map,java.lang.Boolean)
29.05 11:31:19 [Server] WARN at java.base/java.lang.Class.getDeclaredMethod(Class.java:2422)
29.05 11:31:19 [Server] WARN at skript-yaml-1.7.2.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.<clinit>(SkriptYamlRepresenter.java:39)
29.05 11:31:19 [Server] WARN at skript-yaml-1.7.2.jar//me.sashie.skriptyaml.SkriptYaml.onEnable(SkriptYaml.java:136)
29.05 11:31:19 [Server] WARN at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279)
29.05 11:31:19 [Server] WARN at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:207)
29.05 11:31:19 [Server] WARN at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109)
29.05 11:31:19 [Server] WARN at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520)
29.05 11:31:19 [Server] WARN at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:637)
29.05 11:31:19 [Server] WARN at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:594)
29.05 11:31:19 [Server] WARN at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:680)
29.05 11:31:19 [Server] WARN at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:386)
29.05 11:31:19 [Server] WARN at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1301)
29.05 11:31:19 [Server] WARN at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304)
29.05 11:31:19 [Server] WARN at java.base/java.lang.Thread.run(Thread.java:1474)

Server Version: 26.1.2-63-711c5de (MC: 26.1.2)
Server type: Paper
Skript Version: 2.15.2 (skriptlang-github)
skript-yaml v1.7.2

[MadPanCake]

I can reproduce this too. On my setup skript-yaml loads, but YAML saving is broken, so the addon is not usable for writing YAML files.

Environment

• Paper 26.1.2-67-main@10a73fe, Minecraft 26.1.2
• Java 25.0.1, Eclipse Adoptium Temurin
• Skript 2.15.2
• skript-yaml 1.7.2
• OS: Windows 11

Minimal reproduction

on load:
    load yaml "plugins/Skript/test.yml" as "test_yaml"
    set yaml value "test" from "test_yaml" to "hello"
    save yaml "test_yaml"

Startup error

[11:22:35] [Server thread/INFO]: [skript-yaml] Enabling skript-yaml v1.7.2
[11:22:35] [Server thread/WARN]: java.lang.NoSuchMethodException: org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(org.yaml.snakeyaml.nodes.Tag,java.util.Map,java.lang.Boolean)
[11:22:35] [Server thread/WARN]: 	at java.base/java.lang.Class.getDeclaredMethod(Class.java:2422)
[11:22:35] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.<clinit>(SkriptYamlRepresenter.java:39)
[11:22:35] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.SkriptYaml.onEnable(SkriptYaml.java:136)

Error when saving YAML

[11:23:02] [Server thread/WARN]: [skript-yaml] The yaml 'resource_pack' hasnt been populated yet [script: core.sk, line: 337]
[11:23:02] [Server thread/WARN]: java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Method.invoke(Object, Object[])" because "me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.representScalarMethod" is null
[11:23:02] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.representScalar(SkriptYamlRepresenter.java:129)
[11:23:02] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter$RepresentString.representData(SkriptYamlRepresenter.java:111)
[11:23:02] [Server thread/WARN]: 	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:105)
[11:23:02] [Server thread/WARN]: 	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:174)
[11:23:02] [Server thread/WARN]: 	at org.yaml.snakeyaml.Yaml.dump(Yaml.java:266)
[11:23:02] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.utils.yaml.YAMLProcessor.save(YAMLProcessor.java:333)
[11:23:02] [Server thread/WARN]: 	at skript-yaml.jar//me.sashie.skriptyaml.skript.EffSaveYaml.execute(EffSaveYaml.java:65)

It looks like SkriptYamlRepresenter is trying to reflect the old SnakeYAML method signature with Boolean flow style, but the runtime SnakeYAML API no longer has that signature.

[sajeebkumar]

[13:59:50 INFO]: [skript-yaml] Enabling skript-yaml v1.7.2
[13:59:50 WARN]: java.lang.NoSuchMethodException: org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(org.yaml.snakeyaml.nodes.Tag,java.util.Map,java.lang.Boolean)
[13:59:50 WARN]: at java.base/java.lang.Class.getDeclaredMethod(Class.java:2422)
[13:59:50 WARN]: at skript-yaml-1.7.2.jar//me.sashie.skriptyaml.utils.yaml.SkriptYamlRepresenter.(SkriptYamlRepresenter.java:39)
[13:59:50 WARN]: at skript-yaml-1.7.2.jar//me.sashie.skriptyaml.SkriptYaml.onEnable(SkriptYaml.java:136)
[13:59:50 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279)
[13:59:50 WARN]: at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:207)
[13:59:50 WARN]: at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109)
[13:59:50 WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520)
[13:59:50 WARN]: at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:651)
[13:59:50 WARN]: at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:608)
[13:59:50 WARN]: at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:684)
[13:59:50 WARN]: at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:429)
[13:59:50 WARN]: at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1316)
[13:59:50 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:304)
[13:59:50 WARN]: at java.base/java.lang.Thread.run(Thread.java:1474)

[ILikeOrangeJuice]

Any update yet, especially since 26.2 is already out?

Best regards.

[ILikeOrangeJuice]

Bump