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Support 1.21.{5, 6, 7} #366

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@TsubakiDev
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@TsubakiDev TsubakiDev commented Jun 28, 2025 •
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  • Update to packetevents 2.8.0

@deivaxxx
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deivaxxx commented Jun 28, 2025

rly

@jivanpal
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jivanpal commented Jul 5, 2025 •
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@TsubakiDev Are you able to provide build instructions here and/or provide the compiled plugin JAR on your repo's releases page? Simply running ./gradlew build completes successfully, but the resulting JAR is unable to be loaded, with the following error:

[17:55:59] [Server thread/ERROR]: [ModernPluginLoadingStrategy] Could not load plugin 'LibreLogin.jar' in folder 'plugins'
java.lang.NoClassDefFoundError: xyz/kyngs/librelogin/api/provider/LibreLoginProvider
        at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?]
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperSimplePluginClassLoader.findClass(PaperSimplePluginClassLoader.java:103) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) ~[?:?]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:118) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:107) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        at java.base/java.lang.Class.forName0(Native Method) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:534) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:513) ~[?:?]
        at io.papermc.paper.plugin.provider.util.ProviderUtil.loadClass(ProviderUtil.java:50) ~[purpur-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.provider.util.ProviderUtil.loadClass(ProviderUtil.java:29) ~[purpur-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.provider.type.paper.PaperPluginParent$PaperServerPluginProvider.createInstance(PaperPluginParent.java:169) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.provider.type.paper.PaperPluginParent$PaperServerPluginProvider.createInstance(PaperPluginParent.java:139) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.strategy.modern.ModernPluginLoadingStrategy.loadProviders(ModernPluginLoadingStrategy.java:116) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:38) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:39) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:581) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:269) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1176) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:311) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: xyz.kyngs.librelogin.api.provider.LibreLoginProvider
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:146) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:107) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        ... 23 more

I encounter essentially the same error when trying use a JAR built from the 0.24.0 source (current master branch on this original repo) with Purpur 1.21.4-2416. The actual JAR provided on the releases page works fine. I am building on Debian 12 with the msopenjdk-21 and gradle packages installed (Microsoft OpenJDK 21.0.5, Gradle 4.4.1):

$ java -version
openjdk version "21.0.5" 2024-10-15 LTS
OpenJDK Runtime Environment Microsoft-10376803 (build 21.0.5+11-LTS)
OpenJDK 64-Bit Server VM Microsoft-10376803 (build 21.0.5+11-LTS, mixed mode, sharing)

$ javac -version
javac 21.0.5

$ gradle --version
openjdk version "21.0.5" 2024-10-15 LTS
OpenJDK Runtime Environment Microsoft-10376803 (build 21.0.5+11-LTS)
OpenJDK 64-Bit Server VM Microsoft-10376803 (build 21.0.5+11-LTS, mixed mode, sharing)

------------------------------------------------------------
Gradle 4.4.1
------------------------------------------------------------

Build time:   2012-12-21 00:00:00 UTC
Revision:     none

Groovy:       2.4.21
Ant:          Apache Ant(TM) version 1.10.13 compiled on February 6 2023
JVM:          21.0.5 (Microsoft 21.0.5+11-LTS)
OS:           Linux 6.1.0-37-amd64 amd64

@TsubakiDev
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TsubakiDev commented Jul 6, 2025

@TsubakiDev Are you able to provide build instructions here and/or provide the compiled plugin JAR on your repo's releases page? Simply running ./gradlew build completes successfully, but the resulting JAR is unable to be loaded, with the following error:

[17:55:59] [Server thread/ERROR]: [ModernPluginLoadingStrategy] Could not load plugin 'LibreLogin.jar' in folder 'plugins'
java.lang.NoClassDefFoundError: xyz/kyngs/librelogin/api/provider/LibreLoginProvider
        at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
        at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) ~[?:?]
        at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperSimplePluginClassLoader.findClass(PaperSimplePluginClassLoader.java:103) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:593) ~[?:?]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:118) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:107) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        at java.base/java.lang.Class.forName0(Native Method) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:534) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:513) ~[?:?]
        at io.papermc.paper.plugin.provider.util.ProviderUtil.loadClass(ProviderUtil.java:50) ~[purpur-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.provider.util.ProviderUtil.loadClass(ProviderUtil.java:29) ~[purpur-api-1.21.5-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.provider.type.paper.PaperPluginParent$PaperServerPluginProvider.createInstance(PaperPluginParent.java:169) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.provider.type.paper.PaperPluginParent$PaperServerPluginProvider.createInstance(PaperPluginParent.java:139) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.strategy.modern.ModernPluginLoadingStrategy.loadProviders(ModernPluginLoadingStrategy.java:116) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.storage.SimpleProviderStorage.enter(SimpleProviderStorage.java:38) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.LaunchEntryPointHandler.enter(LaunchEntryPointHandler.java:39) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:581) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:269) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1176) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:311) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: xyz.kyngs.librelogin.api.provider.LibreLoginProvider
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:146) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at io.papermc.paper.plugin.entrypoint.classloader.PaperPluginClassLoader.loadClass(PaperPluginClassLoader.java:107) ~[purpur-1.21.5.jar:1.21.5-2450-61d7f55]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        ... 23 more

I encounter essentially the same error when trying use a JAR built from the 0.24.0 source (current master branch on this original repo) with Purpur 1.21.4-2416. The actual JAR provided on the releases page works fine. I am building on Debian 12 with the msopenjdk-21 and gradle packages installed (Microsoft OpenJDK 21.0.5, Gradle 4.4.1):

$ java -version
openjdk version "21.0.5" 2024-10-15 LTS
OpenJDK Runtime Environment Microsoft-10376803 (build 21.0.5+11-LTS)
OpenJDK 64-Bit Server VM Microsoft-10376803 (build 21.0.5+11-LTS, mixed mode, sharing)

$ javac -version
javac 21.0.5

$ gradle --version
openjdk version "21.0.5" 2024-10-15 LTS
OpenJDK Runtime Environment Microsoft-10376803 (build 21.0.5+11-LTS)
OpenJDK 64-Bit Server VM Microsoft-10376803 (build 21.0.5+11-LTS, mixed mode, sharing)

------------------------------------------------------------
Gradle 4.4.1
------------------------------------------------------------

Build time:   2012-12-21 00:00:00 UTC
Revision:     none

Groovy:       2.4.21
Ant:          Apache Ant(TM) version 1.10.13 compiled on February 6 2023
JVM:          21.0.5 (Microsoft 21.0.5+11-LTS)
OS:           Linux 6.1.0-37-amd64 amd64

In this project, please use ./gradlew shadowJar to compile the jar file, because running ./gradlew build directly will not package the libraries into the jar file.

I have published the prebuilt jar in the https://github.com/MGTown/Librelogin repository.

@TsubakiDev TsubakiDev changed the title Update packetevents version Support 1.21.{5, 6, 7} Jul 7, 2025
@pbl0
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pbl0 commented Jul 12, 2025

Was getting this error on 1.21.7 when typing /login with the prebuilt jar.

[18:40:24 INFO]: BZ34 joined the game
[18:40:24 INFO]: BZ34[/192.168.1.18:53432] logged in with entity id 869 at ([limbo]0.0, 70.0, 0.0)
[18:40:39 INFO]: [packetevents] xyz.kyngs.librelogin.lib.packetevents.api.exception.PacketProcessException: Failed to map the Packet ID 12 to a PacketType constant. Bound: SERVER, Connection state: CONFIGURATION, Server version: 1.21.5
[18:40:39 INFO]: [packetevents] Disconnected BZ34 due to an invalid packet!
[18:40:39 INFO]: BZ34 lost connection: Disconnected
[18:40:39 INFO]: BZ34 left the game

Updating packetevents version to 2.9.1 and rebuilding seems to fix it.

@TsubakiDev
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TsubakiDev commented Jul 15, 2025 via email

@TsubakiDev
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TsubakiDev commented Jul 21, 2025

I have republished the jar.

@bassik1
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bassik1 commented Sep 21, 2025

hi, is there possibility to update to 1.21.8? thanks

@jakmar06
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jakmar06 commented Sep 21, 2025

https://modrinth.com/plugin/libreloginprod/

hi, is there possibility to update to 1.21.8? thanks

@MiguVT
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MiguVT commented Dec 16, 2025

Hi! I made my own fork removing the dependencies that made the plugin hard to update (Moved from protocolize to PacketEvents), I want to share it here if someone needs an updated version, if kyngs want to continue supporting it I can make a PR <3 https://github.com/MiguVerse/LibreLoginNext

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7 participants

@TsubakiDev @deivaxxx @jivanpal @pbl0 @bassik1 @jakmar06 @MiguVT