netty遇到的一个bug

​ 启动netty报如下异常，工具异常提示能确定重复使用Handler导致的，但我检查了代码不知道是哪里重复使用的。

io.netty.channel.ChannelPipelineException: com.hcy.FrpsHandler is not a @Sharable handler, so can't be added or removed multiple times.
	at io.netty.channel.DefaultChannelPipeline.checkMultiplicity(DefaultChannelPipeline.java:600)
	at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:202)
	at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:381)
	at io.netty.channel.DefaultChannelPipeline.addLast(DefaultChannelPipeline.java:370)
	at io.netty.bootstrap.ServerBootstrap$ServerBootstrapAcceptor.channelRead(ServerBootstrap.java:203)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:93)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)

此bug引发的原因是因为，我在创建ServerBootstrap时，传入childHandler时，因为比较简单所以直接new出来的Handler，没有使用ChannelInitializer。

而直接new的Handler会存储在ServerBootstrap中，每个连接都使用相同的Handler，而我的Handler是不允许共享的才导致的错误。

改成使用ChannelInitializer，每次都重新new Handler 即可。