netty - Netty ExceptionInInitializerError
问题描述
我进入了一个物联网项目,并试图理清学习曲线和一个奇怪的方法角度。我是一名 .Net 程序员,似乎首选库是基于 Java 的 Netty。我们的客户已经在研究将其放置在他们的设备上,并坚持使用 HTTP 而不是 MQTT,因为他们不希望防火墙配置成为正常因素。
所以,我应该让你知道的第一件事是,我首先尝试使用 DotNetty 作为客户端和代理,但我无法确定库的正面或反面,因为它没有文档并且我无法绑定我的对象在对象资源管理器中看到了我在 Netty 文档中看到的内容。然后我突然想到,也许我可以做一些我在 Xamarin 中看到的事情,在那里我清楚地从 C# 代码访问 Java 库。这导致我使用 LKVM,它允许我将 Netty jar 文件转换为 DLL 文件。
因此,当我使用 Visual Studio 和 C# 时,我现在能够遵循 Netty 教程和文档,这让我取得了相当大的进步。
我写了一个小控制台应用程序,它应该像一个带有 Netty 客户端的 IOT 设备。我使用我生成的 DLL 来编写客户端。我在尝试连接时遇到错误,并假设由于我没有代理,它只是找不到端点。所以今天我写了服务器代码。完成后,我尝试再次连接设备并得到相同的错误。
然后我启动了 Fiddler,这样我就可以检查流量,发现没有流量。因此,错误发生在任何尝试连接之前。
所以,在我继续之前,这里是客户端代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using JSON = Newtonsoft.Json.JsonConvert;
using io.netty.util;
using io.netty.bootstrap;
using io.netty.buffer;
using io.netty.channel;
using io.netty.channel.nio;
using io.netty.channel.socket;
using io.netty.channel.socket.nio;
using io.netty.handler.codec.http;
using io.netty.handler.codec.http.websocketx;
using io.netty.handler.codec.http.websocketx.extensions.compression;
using io.netty.handler.ssl;
using io.netty.handler.ssl.util;
using java.io;
using java.net;
using io.netty.util.concurrent;
namespace Device
{
public class WebSocketClient
{
public string URL { get; set; }
public URI Uri = null;
public Uri netUri = null;
public string Host;
public int Port;
public Channel Channel;
public Bootstrap BootStrap = new Bootstrap();
public WebSocketClientHandler Handler;
public EventLoopGroup Group = new NioEventLoopGroup();
public SslContext SslCtx = null;
public WebSocketClient(string URL)
{
this.URL = URL;
netUri = new Uri(this.URL);
Uri = new URI(URL);
Host = netUri.Host;
Port = netUri.Port;//Unlike the Netty example, .Net knows the ws/wss ports.
bool SSL = Port == 443;
if (SSL)
{
SslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
}
Handler = new WebSocketClientHandler(WebSocketClientHandshakerFactory.newHandshaker(Uri, WebSocketVersion.V13, null, true, new DefaultHttpHeaders()));
//BootStrap.group(Group).channel(new NioSocketChannel().GetType().handler(new ChannelInitializer(Handler, Host, Port, SslCtx))).connect(Host, Port).sync().channel();
}
public void Connect()
{
//Channel = BootStrap.connect(Host, Port).sync().channel();
//Channel = BootStrap.connect().sync().channel();
//((Bootstrap)BootStrap.group(Group).channel(new NioSocketChannel().GetType()).handler(new ChannelInitializer(Handler, Host, Port, SslCtx))).connect(Host, Port).sync().channel();
BootStrap = BootStrap.group(Group) as Bootstrap;
BootStrap = BootStrap.channel(new NioSocketChannel().GetType()) as Bootstrap;
BootStrap = BootStrap.handler(new ChannelInitializer(Handler, Host, Port, SslCtx)) as Bootstrap;
//BootStrap.remoteAddress(Host, Port);
//BootStrap.localAddress(Host, Port);
ChannelFuture cf = BootStrap.connect(Host, Port);
cf = cf.sync();
Channel = cf.channel();
Handler.HandshakeFuture().sync();
}
public void Close()
{
Group.shutdownGracefully();
}
public void Ping()
{
WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte[] { 8, 1, 8, 1 }));
Channel.writeAndFlush(frame);
}
public void Send(string content)
{
Channel.writeAndFlush(content);
Channel.newPromise().addListener(new Listener());
}
}
public class Listener : GenericFutureListener
{
public void operationComplete(Future f)
{
System.Console.WriteLine(JSON.SerializeObject(f.get()));
}
}
}
在构造函数中,有一条注释行模仿了他们的客户端示例中的内容。因为它是链式的,所以很难判断错误来自哪里。所以,我把它移到了我的连接函数中并打破了它。
在连接函数中,以下行是我看到问题的第一个迹象:
ChannelFuture cf = BootStrap.connect(Host, Port);
如果我查看“手表”中的对象,我可以看到似乎已经存在错误。它看起来像这样:
{DefaultChannelPromise@67755d(failure: java.lang.ExceptionInInitializerError)}
但是,它不会在该行出错,而是在以下行出错:
cf = cf.sync();
堆栈跟踪如下所示:
at io.netty.util.internal.PlatformDependent0.throwException(Exception )
at io.netty.util.internal.PlatformDependent.throwException(Exception t)
at io.netty.util.concurrent.DefaultPromise.rethrowIfFailed()
at io.netty.util.concurrent.DefaultPromise.sync()
at io.netty.channel.DefaultChannelPromise.sync()
at io.netty.channel.DefaultChannelPromise.<bridge>sync()
at io.netty.channel.DefaultChannelPromise.io.netty.channel.ChannelFuture/()Lio.netty.channel.ChannelFuture;sync()
at Device.WebSocketClient.Connect() in c:\Users\ME\Documents\Visual Studio 2017\Projects\MQTT Sandbox\Device\WebSocketClient.cs:line 70
at Device.Program.SocketTest() in c:\Users\ME\Documents\Visual Studio 2017\Projects\MQTT Sandbox\Device\Program.cs:line 106
at Device.Program.Main(String[] args) in c:\Users\ME\Documents\Visual Studio 2017\Projects\MQTT Sandbox\Device\Program.cs:line 72
我唯一的另一个线索是,如果我探索该异常,则该异常有一个子异常(与内部异常相反),上面写着:“未知指针大小”。该堆栈跟踪如下所示:
我今天花了很大一部分时间进行修补和研究,但我完全没有找到任何关于哪里出了问题的线索。任何帮助将不胜感激。
提前感谢您的帮助!
更新 我能够从 ChannelFuture cf = BootStrap.connect(Host, Port); 中提取更好的堆栈跟踪
May 29, 2018 8:25:37 AM io.netty.channel.DefaultChannelId defaultProcessId
WARNING: Failed to find the current process ID from ''; using a random value: -251539282
May 29, 2018 8:25:43 AM io.netty.channel.AbstractChannel$AbstractUnsafe register
WARNING: Force-closing a channel whose registration task was not accepted by an event loop: [id: 0x6312b48a]
java.lang.ExceptionInInitializerError
at io.netty.util.internal.shaded.org.jctools.queues.LinkedArrayQueueUtil.modifiedCalcElementOffset(LinkedArrayQueueUtil.java:24)
at io.netty.util.internal.shaded.org.jctools.queues.BaseMpscLinkedArrayQueue.offer(BaseMpscLinkedArrayQueue.java:308)
at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:330)
at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:321)
at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:765)
at io.netty.channel.AbstractChannel$AbstractUnsafe.register(AbstractChannel.java:479)
at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:81)
at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:74)
at io.netty.channel.MultithreadEventLoopGroup.register(MultithreadEventLoopGroup.java:86)
at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:333)
at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:163)
at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:145)
at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:126)
at cli.Device.WebSocketClient.Connect(WebSocketClient.cs:70)
at cli.Device.Program.SocketTest(Program.cs:106)
at cli.Device.Program.Main(Program.cs:72)
Caused by: java.lang.IllegalStateException: Unknown pointer size
at io.netty.util.internal.shaded.org.jctools.util.UnsafeRefArrayAccess.<clinit>(UnsafeRefArrayAccess.java:51)
... 11 more
May 29, 2018 8:25:43 AM io.netty.util.concurrent.DefaultPromise safeExecute
SEVERE: Failed to submit a listener notification task. Event loop shut down?
java.lang.NoClassDefFoundError: Could not initialize class io.netty.util.internal.shaded.org.jctools.util.UnsafeRefArrayAccess
at io.netty.util.internal.shaded.org.jctools.queues.LinkedArrayQueueUtil.modifiedCalcElementOffset(LinkedArrayQueueUtil.java:24)
at io.netty.util.internal.shaded.org.jctools.queues.BaseMpscLinkedArrayQueue.offer(BaseMpscLinkedArrayQueue.java:308)
at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:330)
at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:321)
at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:765)
at io.netty.util.concurrent.DefaultPromise.safeExecute(DefaultPromise.java:764)
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:438)
at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
at io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:84)
at io.netty.channel.AbstractChannel$CloseFuture.setClosed(AbstractChannel.java:1148)
at io.netty.channel.AbstractChannel$AbstractUnsafe.register(AbstractChannel.java:491)
at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:81)
at io.netty.channel.SingleThreadEventLoop.register(SingleThreadEventLoop.java:74)
at io.netty.channel.MultithreadEventLoopGroup.register(MultithreadEventLoopGroup.java:86)
at io.netty.bootstrap.AbstractBootstrap.initAndRegister(AbstractBootstrap.java:333)
at io.netty.bootstrap.Bootstrap.doResolveAndConnect(Bootstrap.java:163)
at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:145)
at io.netty.bootstrap.Bootstrap.connect(Bootstrap.java:126)
at cli.Device.WebSocketClient.Connect(WebSocketClient.cs:70)
at cli.Device.Program.SocketTest(Program.cs:106)
at cli.Device.Program.Main(Program.cs:72)
解决方案
我在我的 IKVM 分支中找到了解决方案并实施了修复。https://github.com/Draspax/ikvm8
基本上在类 io.netty.util.internal.shaded.org.jctools.util.UnsafeRefArrayAccess 中有一个调用 UnsafeAccess.UNSAFE.arrayIndexScale(Object[].class); 它应该返回 4 或 8,并且 IKVM Unsafe 实现不考虑 Object[].class,因此它返回默认值 1。我已添加对象数组作为 arrayIndexScale 的选项以返回 4。
希望这些人能够让 IKVM 保持活力,尽快将其包含在https://github.com/wwrd/ikvm8中。
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