[WARN ]io.netty.channel.ChannelInitializer - Failed to initialize a channel. Closing:

java.lang.NullPointerException: null
at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:127)
at io.netty.channel.ChannelInitializer.channelRegistered(ChannelInitializer.java:78)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:161)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:147)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRegistered(AbstractChannelHandlerContext.java:140)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRegistered(DefaultChannelPipeline.java:1381)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:161)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRegistered(AbstractChannelHandlerContext.java:147)
at io.netty.channel.DefaultChannelPipeline.fireChannelRegistered(DefaultChannelPipeline.java:824)
at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:518)
at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:428)
at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:487)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:405)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:906)
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)
使用的是netty4，ChannelInboundHandlerAdapter上也加了@Sharable也不行，有人知道怎么解决吗？