An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception

Question

问题：SocketIO 连接  网页链接正常 在手机上运行报下面错误

```

elAdmin- 2020-10-24 20:31:17 [nioEventLoopGroup-6-8] WARN i.n.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.

java.lang.NumberFormatException: For input string: "true"

at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)

at java.base/java.lang.Integer.parseInt(Integer.java:652)

at java.base/java.lang.Integer.valueOf(Integer.java:983)

at com.corundumstudio.socketio.transport.PollingTransport.channelRead(PollingTransport.java: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 com.corundumstudio.socketio.handler.AuthorizeHandler.channelRead(AuthorizeHandler.java:115)

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.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:108)

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.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)

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 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.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)

at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:628)

at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:528)

at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:482)

at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442)

at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)

at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

at java.base/java.lang.Thread.run(Thread.java:832)

```

尝试过

```

@Override

  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

    ctx.close();

  }

```

```

@Override

  protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {

    try {

      if(httpObject instanceof HttpRequest){

        ByteBuf content = Unpooled.copiedBuffer("sb", CharsetUtil.UTF_8);

        FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK,content);

        response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");

        response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());

        channelHandlerContext.writeAndFlush(response);

      }

    }catch (Exception e){

      e.printStackTrace();

    }

  }

```

网页运行正常 手机报错

Answer 1

看提示的意思是：远程主机强迫关闭了一个现有的连接。

java.lang.NumberFormatException: For input string: "true"

at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)

at java.base/java.lang.Integer.parseInt(Integer.java:652)

at java.base/java.lang.Integer.valueOf(Integer.java:983)

这块的提示，说明你程序中用到了类型转换，字符串类型转Integer类型的时候，存在非数字字符。