netty4 io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

在netty4中，对象的生命周期由引用计数器控制，ByteBuf就是如此，每个对象的初始化引用计数加1，调用一次release方法，引用计数器会减1，当尝试访问计数器为0时，对象时，会抛出IllegalReferenceCountException，正如ensureAccessible的实现，更加详细的解释可以参考官方文档

原因分析：日志显示refCnt=0了，表明使用的这个ByteBuf已经被回收了，代码中调用ctx.writeAndFlush(buff)会使此次ByteBuf回收也即将refCnt置为0

个人理解：ack消息代码里;

buff.release();netty提供的一个释放ByteBuf内存的方法(ReferenceCountUtil.release(msg);)，
如果不采用这个，直接调用ByteBuf.release方法也可以，但是因为上面调用了writeAndFlush方法，
已经将ByteBuf的refCnt置为0了，这个里面调用的时候又会在设置一次，但是发现已经为0了，
所以就抛出的该异常。

报错信息：

io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1at io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:101)at com.alex.data.netty.utils.NettyUtil.sendMessage(NettyUtil.java:35)at com.alex.data.netty.service.ServiceMessage.handlerVehLoginData(ServiceMessage.java:124)at com.alex.data.netty.service.ServiceMessage.analysisVehDataByMessage(ServiceMessage.java:69)at com.alex.data.netty.server.VehMessageHandler.channelRead(VehMessageHandler.java:72)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276)at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)at java.lang.Thread.run(Thread.java:745)

ack消息的方式如下

    /*** 发送消息* @param msg* @param channel*/public static void sendMessage(byte[] msg, Channel channel) {if(channel == null) {logger.error("channel == null,can't ack msg|"+ CodecUtil.byte2HexStr(msg));return;}ByteBuf buff = channel.alloc().buffer();buff.writeBytes(msg);channel.writeAndFlush(buff);
//TODO      buff.release();//此处会引起 对象的生命周期由引用计数器控制异常分析 IllegalReferenceCountException refCnt: 0, decrement: 1}

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