andylizi / haproxy-detector Goto Github PK

A Minecraft plugin that enables proxied and direct connections both at the same time.

License: GNU Lesser General Public License v3.0

Java 100.00%

bukkit-plugin spigot-plugin bungeecord-plugin haproxy velocity-plugin minecraft

haproxy-detector's Introduction

HAProxyDetector

This BungeeCord (and now Spigot and Velocity) plugin enables proxied and direct connections both at the same time. More infomation about HAProxy and its uses can be found here.

Security Warning

Allowing both direct and proxied connections has significant security implications — a malicious player can access the server through their own HAProxy instance, thus tricking the server into believing the connection is coming from a fake IP.

To counter this, this plugin implements IP whitelisting. By default, only proxied connections from localhost will be allowed (direct connections aren't affected). You can add the IP/domain of your trusted HAProxy instance by editing whitelist.conf, which can be found under the plugin data folder.

Details of the whitelist format

# List of allowed proxy IPs
#
# An empty whitelist will disallow all proxies.
# Each entry must be an valid IP address, domain name or CIDR.
# Domain names will be resolved only once at startup.
# Each domain can have multiple A/AAAA records, all of them will be allowed.
# CIDR prefixes are not allowed in domain names.

127.0.0.0/8
::1/128

If you want to disable the whitelist (which you should never do), you can do so by putting this line verbatim, before any other entries:

YesIReallyWantToDisableWhitelistItsExtremelyDangerousButIKnowWhatIAmDoing!!!

Platform-specific Notes

BungeeCord

proxy_protocol needs to be enabled in BC config.yml for this plugin to work. (Not to be confused with the similar option in paper.yml)

Older versions of BC can in theory use BungeeProxy in parallel with this plugin, but it hasn't been tested yet. Feedback is welcomed.

Spigot and its derivatives

ProtocolLib is a required dependency. This plugin was developed using ProtocolLib v4.8.0; please try that version first if there are any errors. Check out issue #3 for experimental support for ProtocolLib 5.0.

Paper

New versions of Paper have built-in HAProxy support (proxied connection only). It's not compatible with this plugin, so please disable the proxy-protocol option in paper.yml.

Velocity

haproxy-protocol needs to be enabled in Velocity config for this plugin to work.

Versions older than 3.0 are not supported.

Java >= 9

If errors like NoClassDefFoundError: sun.misc.Unsafe, InaccessibleObjectException and such are encountered, please add --add-opens java.base/java.lang.invoke=ALL-UNNAMED to JVM arguments.

Java >= 18

If errors like IllegalAccessException: static final field has no write access are encountered, please upgrade the plugin to at least v3.0.2.

If you cannot upgrade for whatever reason, a temporary workaround would be to add -Djdk.reflect.useDirectMethodHandle=false to JVM arguments.

Note that this argument will be removed in future Java releases.

Metrics

This plugin uses bStats for metrics. It collects some basic information, like how many people use this plugin and the total player count. You can opt out at any time by editing the config file under plugins/bStats/.

haproxy-detector's People

Contributors

Stargazers

Watchers

Forkers

mhy278 gundami icesoulhanxi mclk623 dreeam-qwq cxzlw xchao263 aplini plutoproject ghost-chu

haproxy-detector's Issues

Velocity冲突问题

在服务器中如果只启用spigot.yml的bungeecord = true将无法连接到服务器，提示无法连接至If you wish to use IP forwarding, please enable it in your BungeeCord config as well!
如果启用paper.yml中的proxy-protocol选项也将无法进入服务器，提示ReadTimeOut且下游服务器没有任何实质性的响应
我在想这属不属于一个反向代理的逻辑BUG？

bungeecord 启动时报错

如题，启动时报错，Openjdk 18
以下为报错抛出的异常
21:24:14 [警告] Exception encountered when loading plugin: HAProxyDetector
java.lang.InternalError: java.lang.IllegalAccessException: static final field has no write access: net.md_5.bungee.netty.PipelineUtils.SERVER_CHILD/io.netty.channel.ChannelInitializer/putStatic, from class java.lang.Object (module java.base)
at java.base/jdk.internal.reflect.MethodHandleAccessorFactory.newFieldAccessor(MethodHandleAccessorFactory.java:167)
at java.base/jdk.internal.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:176)
at java.base/java.lang.reflect.Field.acquireOverrideFieldAccessor(Field.java:1184)
at java.base/java.lang.reflect.Field.getOverrideFieldAccessor(Field.java:1153)
at java.base/java.lang.reflect.Field.get(Field.java:428)
at net.andylizi.haproxydetector.bungee.BungeeMain.onEnable(BungeeMain.java:102)
at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:265)
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:285)
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:67)
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15)
Caused by: java.lang.IllegalAccessException: static final field has no write access: net.md_5.bungee.netty.PipelineUtils.SERVER_CHILD/io.netty.channel.ChannelInitializer/putStatic, from class java.lang.Object (module java.base)
at java.base/java.lang.invoke.MemberName.makeAccessException(MemberName.java:955)
at java.base/java.lang.invoke.MethodHandles$Lookup.unreflectField(MethodHandles.java:3494)
at java.base/java.lang.invoke.MethodHandles$Lookup.unreflectSetter(MethodHandles.java:3485)
at java.base/java.lang.invoke.MethodHandleImpl$1.unreflectField(MethodHandleImpl.java:1637)
at java.base/jdk.internal.reflect.MethodHandleAccessorFactory.newFieldAccessor(MethodHandleAccessorFactory.java:145)
... 9 more

关于ProtocolLib 5.1.0

不知道是否支持到ProtocolLib的5.1.0版本了，我现在安装插件不加载

Support for 1.20.4?

I'm using spigot 1.20.4 w/ latest dev build from here.

Here is the error log:

[13:23:30] [Server thread/ERROR]: Error occurred while enabling HAProxyDetector v3.1.0-SNAPSHOT (Is it up to date?)
java.lang.NoClassDefFoundError: com/comphenix/protocol/ProtocolLibrary
        at net.andylizi.haproxydetector.bukkit.BukkitMain.onEnable(BukkitMain.java:51) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:266) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:480) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugin(CraftServer.java:539) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4021-Spigot-864e4ac-fb97348]
        at org.bukkit.craftbukkit.v1_20_R3.CraftServer.enablePlugins(CraftServer.java:453) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4021-Spigot-864e4ac-fb97348]
        at net.minecraft.server.dedicated.DedicatedServer.e(DedicatedServer.java:220) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4021-Spigot-864e4ac-fb97348]
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1000) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4021-Spigot-864e4ac-fb97348]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4021-Spigot-864e4ac-fb97348]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.ClassNotFoundException: com.comphenix.protocol.ProtocolLibrary
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:160) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:112) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        ... 10 more

Can't create plugin haproxy-detector

[12:45:55 INFO]: Booting up Velocity 3.3.0-SNAPSHOT (git-350ea7f3-b398)...
[12:45:55 INFO]: Loading localizations...
[12:45:56 INFO]: Connections will use NIO channels, Java compression, Java ciphers
[12:45:56 WARN]: Player info forwarding is disabled! All players will appear to be connecting from the proxy and will have offline-mode UUIDs.
[12:45:56 INFO]: Loading plugins...
[12:45:56 ERROR]: Can't create plugin haproxy-detector
com.google.inject.CreationException: Unable to create injector, see the following errors:

1) [Guice/MissingImplementation]: No implementation for Logger was bound.

Requested by:
1  : VelocityMain.<init>(VelocityMain.java:41)
      \_ for 2nd parameter
     at VelocityPluginModule.configure(VelocityPluginModule.java:47)

Learn more:
  https://github.com/google/guice/wiki/MISSING_IMPLEMENTATION

1 error

======================
Full classname legend:
======================
Logger:               "net.andylizi.haproxydetector.log.Logger"
VelocityMain:         "net.andylizi.haproxydetector.velocity.VelocityMain"
VelocityPluginModule: "com.velocitypowered.proxy.plugin.loader.java.VelocityPluginModule"
========================
End of classname legend:
========================

        at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:589) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.google.inject.internal.InternalInjectorCreator.initializeStatically(InternalInjectorCreator.java:163) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:110) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.google.inject.Guice.createInjector(Guice.java:87) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.google.inject.Guice.createInjector(Guice.java:69) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.google.inject.Guice.createInjector(Guice.java:59) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.velocitypowered.proxy.plugin.loader.java.JavaPluginLoader.createPlugin(JavaPluginLoader.java:129) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.velocitypowered.proxy.plugin.VelocityPluginManager.loadPlugins(VelocityPluginManager.java:155) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.velocitypowered.proxy.VelocityServer.loadPlugins(VelocityServer.java:362) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.velocitypowered.proxy.VelocityServer.start(VelocityServer.java:239) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
        at com.velocitypowered.proxy.Velocity.main(Velocity.java:71) ~[velocity-3.3.0-SNAPSHOT-398.jar:3.3.0-SNAPSHOT (git-350ea7f3-b398)]
[12:45:56 INFO]: Loaded 0 plugins
[12:45:56 INFO]: Listening on /[0:0:0:0:0:0:0:0]:25565
[12:45:56 INFO]: Done (0.49s)!

Minecraft 1.8.9 报错 HAProxyMessage overrides final method release

java版本: 1.8
minecraft版本: 1.8.9
服务端核心: PaperSpigot

[17:16:53 WARN]: Failed to initialize a channel. Closing: [id: 0xd78baa09, /127.0.0.1:50552 => /127.0.0.1:25565]
java.lang.VerifyError: class io.netty.handler.codec.haproxy.HAProxyMessage overrides final method release.()Z
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_333]
        at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_333]
        at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_333]
        at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_333]
        at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_333]
        at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_333]
        at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_333]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_333]
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_333]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:195) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:97) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_333]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_333]
        at java.lang.Class.forName0(Native Method) ~[?:1.8.0_333]
        at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.tree.ClassTypeSignature.accept(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.visitor.Reifier.reifyTypeArguments(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.tree.ClassTypeSignature.accept(Unknown Source) ~[?:1.8.0_333]
        at sun.reflect.generics.repository.ClassRepository.getSuperclass(Unknown Source) ~[?:1.8.0_333]
        at java.lang.Class.getGenericSuperclass(Unknown Source) ~[?:1.8.0_333]
        at io.netty.util.internal.TypeParameterMatcher.find0(TypeParameterMatcher.java:106) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.util.internal.TypeParameterMatcher.find(TypeParameterMatcher.java:78) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.SimpleChannelInboundHandler.<init>(SimpleChannelInboundHandler.java:67) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.SimpleChannelInboundHandler.<init>(SimpleChannelInboundHandler.java:57) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at net.andylizi.haproxydetector.bukkit.HAProxyMessageHandler.<init>(HAProxyMessageHandler.java:23) ~[?:?]
        at net.andylizi.haproxydetector.bukkit.HAProxyInjectorFactory.inject(HAProxyInjectorFactory.java:56) ~[?:?]
        at net.andylizi.haproxydetector.bukkit.HAProxyInjectorFactory.fromChannel(HAProxyInjectorFactory.java:47) ~[?:?]
        at com.comphenix.protocol.injector.netty.ProtocolInjector$1.initChannel(ProtocolInjector.java:161) ~[?:?]
        at io.netty.channel.ChannelInitializer.channelRegistered(ChannelInitializer.java:69) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:158) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:144) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInitializer.channelRegistered(ChannelInitializer.java:71) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:158) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:144) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInitializer.channelRegistered(ChannelInitializer.java:71) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:158) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:144) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRegistered(DefaultChannelPipeline.java:732) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:442) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannel$AbstractUnsafe.register(AbstractChannel.java:412) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:60) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:48) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.MultithreadEventLoopGroup.register(MultithreadEventLoopGroup.java:64) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.bootstrap.ServerBootstrap$ServerBootstrapAcceptor.channelRead(ServerBootstrap.java:251) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at com.comphenix.protocol.injector.netty.ProtocolInjector$3.channelRead(ProtocolInjector.java:187) [ProtocolLib.jar:4.8.0]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:92) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_333]
[17:16:53 WARN]: An exception was thrown by a user handler's exceptionCaught() method while handling the following exception:
java.lang.NullPointerException
        at net.minecraft.server.v1_8_R3.NetworkManager.close(NetworkManager.java:245) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at net.minecraft.server.v1_8_R3.NetworkManager.channelInactive(NetworkManager.java:105) ~[kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:228) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:228) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.handler.timeout.ReadTimeoutHandler.channelInactive(ReadTimeoutHandler.java:144) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:233) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:219) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:769) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.AbstractChannel$AbstractUnsafe$5.run(AbstractChannel.java:567) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:380) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [kamox.jar:git-PaperSpigot-f6fba00-9935adc]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_333]

去除haproxy-detector就没有问题了

所有插件版本都试过了，一样的结果

[00:08:35 INFO]: [ProtocolLib] Loading ProtocolLib v5.0.0-SNAPSHOT-b554
[00:08:36 INFO]: [HAProxyDetector] Loading HAProxyDetector v3.0.1
[00:08:36 INFO]: [ProtocolLib] Enabling ProtocolLib v5.0.0-SNAPSHOT-b554
[00:08:36 INFO]: [ProtocolLib] Started structure compiler thread.
[00:08:36 INFO]: [HAProxyDetector] Enabling HAProxyDetector v3.0.1*
[00:08:36 ERROR]: Error occurred while enabling HAProxyDetector v3.0.1 (Is it up to date?)
java.lang.NoClassDefFoundError: com/comphenix/protocol/injector/netty/ProtocolInjector
        at net.andylizi.haproxydetector.bukkit.BukkitMain.onEnable(BukkitMain.java:59) ~[haproxy-detector-3.0.1.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugin(CraftServer.java:561) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.craftbukkit.v1_17_R1.CraftServer.enablePlugins(CraftServer.java:475) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[patched_1.17.1.jar:git-Purpur-1428]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:322) ~[patched_1.17.1.jar:git-Purpur-1428]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.ClassNotFoundException: com.comphenix.protocol.injector.netty.ProtocolInjector
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:153) ~[patched_1.17.1.jar:git-Purpur-1428]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:105) ~[patched_1.17.1.jar:git-Purpur-1428]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
        ... 10 more
[00:08:36 INFO]: [HAProxyDetector] Disabling HAProxyDetector v3.0.1

Please add support for Java16

When I start the server with Java16, I encounter this error

[19:31:38 WARN]: Exception encountered when loading plugin: HAProxyDetector
java.lang.NoSuchFieldException: modifiers
at java.lang.Class.getDeclaredField(Class.java:2549) ~[?:?]
at net.andylizi.haproxydetector.bungee.BungeeMain.onEnable(BungeeMain.java:75) ~[?:?]
at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:315) ~[waterfall-1.17-448.jar:git:Waterfall-Bootstrap:1.17-R0.1-SNAPSHOT:93773f9:448]
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:290) ~[waterfall-1.17-448.jar:git:Waterfall-Bootstrap:1.17-R0.1-SNAPSHOT:93773f9:448]
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:67) ~[waterfall-1.17-448.jar:git:Waterfall-Bootstrap:1.17-R0.1-SNAPSHOT:93773f9:448]
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15) ~[waterfall-1.17-448.jar:git:Waterfall-Bootstrap:1.17-R0.1-SNAPSHOT:93773f9:448]

Please trouble the author to support Java16, because some plug-ins no longer support the old version of Java in the future
I use translation software, there may be translation errors, sorry