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我有一个不寻常的问题导致我把头发扯掉。我有一个 Netty 客户端/服务器设置。服务器向客户端发送一个命令对象。然后，客户端将在命令对象中找到的每个二进制命令发送到连接到其本地串行端口的设备。每个命令的答案（二进制字符串）存储在命令对象中，当所有命令都执行完毕后，命令对象返回给服务器。因此，我在客户端和服务器管道中都使用了 ObjectEncoder 和 ObjectDecoder。

我有一个特定的、可重复的情况，当特定的命令对象返回到服务器时，服务器会抛出“java.io.StreamCorruptedException：块数据的意外结束”（下面的堆栈跟踪）。我在服务器和客户端上都使用 Netty 3.2.7-Final，我在客户端和服务器上都使用 Oracle Java 1.7.0_02。

真正让我头疼的是，如果我在 Windows 7 下本地运行客户端和服务器，那么作业运行正确。如果我在 Debian Linux 系统上远程运行服务器，则特定作业运行正确。但是，当我在 Linux CentOS 6 系统上运行服务器时，作业每次都会失败，但有异常。（客户端必须在Windows环境下运行）

任何关于如何进一步调试的建议都将非常受欢迎。我已经查看了扩展 ObjectEncoder 以便我可以将序列化对象转储到磁盘以查看在线上放置了什么，但我无法弄清楚如何获取 encode 方法返回的 ChannelBuffer 的内容。

java.io.StreamCorruptedException: unexpected end of block data
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1369)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
    at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:498)
    at java.lang.Throwable.readObject(Throwable.java:913)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
    at java.util.ArrayList.readObject(ArrayList.java:733)
    at sun.reflect.GeneratedMethodAccessor70.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:991)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
    at org.jboss.netty.handler.codec.serialization.ObjectDecoder.decode(ObjectDecoder.java:129)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:282)
    at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:214)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:351)
    at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:282)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:202)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
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1 回答 1

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由于解码时出现问题，

您可以在解码之前将接收到的通道缓冲区十六进制转储到日志并稍后分析。您必须拥有自己的 ObjectDecoder 版本，例如

    @Override
protected Object decode(
        ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {

    ChannelBuffer frame = (ChannelBuffer) super.decode(ctx, channel, buffer);
    if (frame == null) {
        return null;
    }


    logger.debug("Hex dump of object frame [" + ChannelBuffers.hexDump(frame) + "]");

    return new CompactObjectInputStream(
            new ChannelBufferInputStream(frame), classResolver).readObject();
}
于 2012-01-09T16:17:10.157 回答