[BUG] NoSuchMethodError: Ratelimiter.attempt when player joins with LimboAuth on Velocity 3.4.0

[furkqntrn]

Server throws java.lang.NoSuchMethodError related to Ratelimiter.attempt when a player connects using LimboAuth.

[10:11:48 INFO] [limboapi]: fghjkasdaaaa (/176.40.187.24:50509) has connected to the LimboAuth Limbo [10:11:52 ERROR]: [initial connection] /176.40.187.24:50509: exception encountered in net.elytrium.limboapi.server.LimboSessionHandlerImpl@223f9f1e java.lang.NoSuchMethodError: 'boolean com.velocitypowered.proxy.util.ratelimit.Ratelimiter.attempt(java.net.InetAddress)' at net.elytrium.limboauth.handler.AuthSessionHandler.onChat(AuthSessionHandler.java:203) ~[?:?] at net.elytrium.limboapi.server.LimboSessionHandlerImpl.handleChat(LimboSessionHandlerImpl.java:329) ~[?:?] at net.elytrium.limboapi.server.LimboSessionHandlerImpl.handle(LimboSessionHandlerImpl.java:321) ~[?:?] at com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerCommandPacket.handle(SessionPlayerCommandPacket.java:78) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at com.velocitypowered.proxy.connection.MinecraftConnection.channelRead(MinecraftConnection.java:155) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:359) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at com.velocitypowered.proxy.protocol.netty.MinecraftDecoder.tryDecode(MinecraftDecoder.java:91) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at com.velocitypowered.proxy.protocol.netty.MinecraftDecoder.channelRead(MinecraftDecoder.java:60) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:359) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:107) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:359) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:293) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:359) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1429) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:918) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:167) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.handle(AbstractNioChannel.java:445) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.NioIoHandler$DefaultNioRegistration.handle(NioIoHandler.java:383) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.NioIoHandler.processSelectedKey(NioIoHandler.java:577) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.NioIoHandler.processSelectedKeysOptimized(NioIoHandler.java:552) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.NioIoHandler.processSelectedKeys(NioIoHandler.java:493) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.nio.NioIoHandler.run(NioIoHandler.java:470) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.SingleThreadIoEventLoop.runIo(SingleThreadIoEventLoop.java:204) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.channel.SingleThreadIoEventLoop.run(SingleThreadIoEventLoop.java:175) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:1073) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[velo.jar:3.4.0-SNAPSHOT (git-10e75b6d-b515)] at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] [10:11:52 INFO] [limboapi]: fghjkasdaaaa (/176.40.187.24:50509) has disconnected from the LimboAuth Limbo [10:11:52 INFO]: [initial connection] /176.40.187.24:50509 has disconnected

velocity-dump-2025-06-30-10-13-47.json

[furkqntrn]

Using online-mode = false with forwarding-mode = "modern". Premium players bypass auth as expected. The error occurs only for cracked players after completing /register, during LimboAuth chat handling.

[Danill2]

You should use the latest (dev) versions of the LimboAPI, LimboAuth plugins, as well as LimboFilter and LimboAuth.Social.Addon if present. Velocity should also be updated to the latest version.

Direct links to all these latest versions:

LimboAPI [1.1.27-SNAPSHOT (c463aeb)]: https://github.com/Elytrium/LimboAPI/releases/download/dev-build/limboapi-1.1.27-SNAPSHOT.jar

LimboAuth [1.1.14 (bc8ebd9)]: https://github.com/Elytrium/LimboAuth/releases/download/dev-build/limboauth-1.1.14.jar

LimboAuth.Social.Addon [1.0.11-SNAPSHOT (b71e28a)]: https://github.com/Elytrium/LimboAuth-SocialAddon/releases/download/dev-build/LimboAuth.Social.Addon-1.0.11-SNAPSHOT.jar

LimboFilter [1.1.19 (470d97e)]: https://github.com/Elytrium/LimboFilter/releases/download/dev-build/limbofilter-1.1.19.jar

[hdvtdev]

I encountered the same issue. This is caused by binary incompatibility with the latest Velocity 3.4.0-SNAPSHOT builds.

The Technical Cause:
Velocity updated the internal Ratelimiter class to be a Generic interface (Ratelimiter<T>). Due to Java type erasure, the bytecode signature of the method changed:

• Old plugin expects: attempt(Ljava/net/InetAddress;)Z
• New Velocity runtime provides: attempt(Ljava/lang/Object;)Z

The Fix:
Since the repository already targets 3.4.0-SNAPSHOT, you just need to recompile the plugin to link against the latest API build.

1. Clone the repository.
2. Run the build command with dependency refresh:
   • ./gradlew clean shadowJar (Linux/Mac/PowerShell)
   • gradlew clean shadowJar (Windows CMD)
3. Replace old plugin using new from build/libs

The Java compiler will generate the correct bytecode references for the new generic interface, and the error will disappear.

Works fine with Velocity-3.4.0-SNAPSHOT & limboapi-1.1.27-SNAPSHOT.