Hello, i have a Mohist 1.12.2 server and i'm currently using ProtocolLib 4.8.0 in my server beacause ProtocolLib 5.0.0 and 5.0.1 don't start I don't know why.
Yesterday I was playing on my server with some people and after a normal restart the ProtocolLib just was not more letting me enter my server and all of the other people are not able to join my server too. I don't know why, I tried adding more RAM and more CPU for the server, I tried changing for other versions of ProtocolLib, but nothing worked.

What shows on my console when I trie to join the server:
[13:55:14 INFO]: Error Unable to intercept a read client packet. (java.lang.RuntimeException: Error occured while instancing generated class.) occured in com.comphenix.protocol.injector.netty.ChannelInjector@5a4505c0.
[13:55:14 ERROR]: [ProtocolLib] INTERNAL ERROR: Unable to intercept a read client packet.
If this problem hasn't already been reported, please open a ticket
at https://github.com/dmulloy2/ProtocolLib/issues with the following data:
Stack Trace:
java.lang.RuntimeException: Error occured while instancing generated class.
at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:249)
at com.comphenix.protocol.reflect.compiler.CompiledStructureModifier.withTarget(CompiledStructureModifier.java:130)
at com.comphenix.protocol.events.PacketContainer.(PacketContainer.java:139)
at com.comphenix.protocol.injector.netty.ProtocolInjector.onPacketReceiving(ProtocolInjector.java:324)
at com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:600)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:489)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at com.comphenix.protocol.injector.netty.ChannelInjector$2.channelRead(ChannelInjector.java:292)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at com.nickuc.antibot.ςβξιααυει.a(:288)
at com.nickuc.antibot.ςβξιααυει.channelRead(:243)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:284)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at net.minecraft.network.LegacyPingHandler.channelRead(SourceFile:94)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.codec.ByteToMessageDecoder.handlerRemoved(ByteToMessageDecoder.java:236)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:494)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:428)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at com.nickuc.antibot.ΩδΦσωπηοεςβοφΛτ.channelRead(:90)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
at com.nickuc.antibot.ΣΦΦνιγςφ.channelRead(:35)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:808)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:404)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:304)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:233)
... 59 more
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_12_R1/PacketHandshakingInSetProtocol
at com.comphenix.protocol.reflect.compiler.CompiledStructure$net_minecraft_network_handshake_client_C00Handshake$java_lang_Object.(Unknown Source)
... 64 more
Dump:
Parameters:
io.netty.buffer.UnpooledSlicedByteBuf@16690f6f[
buffer=io.netty.buffer.PooledUnsafeDirectByteBuf@4d7f4bf0
adjustment=1
readerIndex=30
writerIndex=30
markedReaderIndex=0
markedWriterIndex=0
maxCapacity=30
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@783ffcd9[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@4f2808e5
packetListeners=[com.comphenix.protocol.async.NullPacketListener@4530533, PacketAdapter[plugin=nLogin, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[SETTINGS[class=PacketPlayInSettings, id=5]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=nLogin, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[TAB_COMPLETE[class=PacketPlayInTabComplete, id=6]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=nLogin, sending=ListeningWhitelist[priority=NORMAL, packets=[WINDOW_ITEMS[class=PacketPlayOutWindowItems, id=20], SET_SLOT[class=PacketPlayOutSetSlot, id=22]], gamephase=PLAYING, options=[]], receiving=EMPTY_WHITELIST], PacketAdapter[plugin=DecentHolograms, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[USE_ENTITY[class=PacketPlayInUseEntity, id=13]], gamephase=PLAYING, options=[ASYNC]]], PacketAdapter[plugin=nLogin, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=LOWEST, packets=[CHAT[class=PacketPlayInChat, id=3]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=nLogin, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=MONITOR, packets=[SET_PROTOCOL[class=PacketHandshakingInSetProtocol, id=0]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=Images, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[SET_CREATIVE_SLOT[class=PacketPlayInSetCreativeSlot, id=40], USE_ENTITY[class=PacketPlayInUseEntity, id=13]], gamephase=PLAYING, options=[]]]]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@589c63b8
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@72227aa1
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@75fc9908
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@7a1cd872
hasClosed=false
classLoader=org.bukkit.plugin.java.PluginClassLoader@7b1ea6a3
reporter=com.comphenix.protocol.ProtocolLib$1@41a6e52a
server=CraftServer{serverName=Mohist,serverVersion=git-Mohist-1.12.2-321,minecraftVersion=1.12.2}
library=ProtocolLib v4.8.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@3195811a
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=1
phasePlayingCount=8
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@65fa01cb
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@78b15be6
hasRecycleDistance=true
minecraftVersion=(MC: 1.12.2)
debug=false
]
Sender:
com.comphenix.protocol.injector.netty.ChannelInjector@5a4505c0[
decodeBuffer=protected void net.minecraft.network.NettyPacketDecoder.decode(io.netty.channel.ChannelHandlerContext,io.netty.buffer.ByteBuf,java.util.List) throws java.lang.Exception
encodeBuffer=protected void net.minecraft.network.NettyPacketEncoder.encode(io.netty.channel.ChannelHandlerContext,java.lang.Object,io.netty.buffer.ByteBuf) throws java.lang.Exception
factory=com.comphenix.protocol.injector.netty.InjectionFactory@74054a3d
player=com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@4144e92f
updated=
playerName=
playerConnection=
networkManager=net.minecraft.network.NetworkManager@3358f48a
originalChannel=[id: 0xffa8559d, L:/172.18.0.4:25793 - R:/85.138.88.224:53971]
channelField=VolatileField [accessor=DefaultFieldAccessor [field=public io.netty.channel.Channel net.minecraft.network.NetworkManager.field_150746_k], container=net.minecraft.network.NetworkManager@3358f48a, previous=[id: 0xffa8559d, L:/172.18.0.4:25793 - R:/85.138.88.224:53971], current=com.comphenix.protocol.injector.netty.ChannelInjector$3@40c537f3, previousLoaded=true, currentSet=true, forceAccess=true]
packetMarker={}
currentEvent=
finalEvent=
unfilteredProcessedPackets=com.comphenix.protocol.injector.netty.PacketFilterQueue@45e8a82
vanillaDecoder=net.minecraft.network.NettyPacketDecoder@7aee8900
vanillaEncoder=net.minecraft.network.NettyPacketEncoder@325832c9
finishQueue=[]
channelListener=com.comphenix.protocol.injector.netty.ProtocolInjector@65fa01cb
processor=com.comphenix.protocol.injector.NetworkProcessor@2b316abf
injected=true
closed=false
cumulation=UnpooledSlicedByteBuf(ridx: 30, widx: 30, cap: 30/30, unwrapped: PooledUnsafeDirectByteBuf(ridx: 42, widx: 42, cap: 42))
cumulator=io.netty.handler.codec.ByteToMessageDecoder$1@25994050
singleDecode=false
decodeWasNull=false
first=true
decodeState=1
discardAfterReads=16
numReads=0
added=true
]
Version:
ProtocolLib v4.8.0
Java Version:
1.8.0_312
Server:
git-Mohist-1.12.2-321 (MC: 1.12.2)
[13:55:14 WARN]: java.lang.IllegalStateException: Handshake data is null in LOGIN state for com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@4144e92f!
[13:55:14 WARN]: at com.nickuc.login.ξξψγξπιω.a(:61)
[13:55:14 WARN]: at com.nickuc.login.ξξψγξπιω.onPacketReceiving(:87)
[13:55:14 WARN]: at com.comphenix.protocol.async.AsyncListenerHandler.processPacket(AsyncListenerHandler.java:642)
[13:55:14 WARN]: at com.comphenix.protocol.async.AsyncListenerHandler.listenerLoop(AsyncListenerHandler.java:596)
[13:55:14 WARN]: at com.comphenix.protocol.async.AsyncListenerHandler.access$200(AsyncListenerHandler.java:48)
[13:55:14 WARN]: at com.comphenix.protocol.async.AsyncListenerHandler$2.run(AsyncListenerHandler.java:229)
[13:55:14 WARN]: at com.comphenix.protocol.async.AsyncListenerHandler$3.run(AsyncListenerHandler.java:300)
[13:55:14 WARN]: at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:64)
[13:55:14 WARN]: at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:50)
[13:55:14 WARN]: at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[13:55:14 WARN]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[13:55:14 WARN]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[13:55:14 WARN]: at java.lang.Thread.run(Thread.java:748)
[13:55:14 INFO]: [nLogin] [ERROR] [Premium] Could not handle incoming packet using ProtocolLib
[13:55:44 INFO]: /85.138.88.224:53971 lost connection: Disconnected

I don't know what to do, anyone can help me?

I discovered that the plugin nLogin it's bugging and doing that error, anyone can tell me why?

Hi, as you already mentioned this is a problem of nLogin.
nLogin uses ProtocolLib and probably does not intercept or send packets correctly.

Probably, the plugin is not compatible with MC 1.12. Please create an issue in the nLogin repository: https://github.com/nickuc/OpeNLogin

Ok thankyou for the help.