jockercheng91 commented on issue #12621:
URL: https://github.com/apache/dubbo/issues/12621#issuecomment-3519606442
Dubbo version: 3.3.0
Java version: 1.8
I also encountered this problem.
```
[biz-device-center-service] 2025-11-04 11:10:37.699 [NettyServerWorker-13-1]
ERROR o.a.d.r.t.netty4.NettyPortUnificationServerHandler - [DUBBO] Unexpected
exception from downstream before protocol detected., dubbo version: 3.3.0,
current host: 10.216.13.14, error code: 99-0. This may be caused by unknown
error in remoting module, go to https://dubbo.apache.org/faq/99/0 to find
instructions.
io.netty.handler.codec.DecoderException: java.lang.NullPointerException
at
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:499)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
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)
Caused by: java.lang.NullPointerException: null
at
org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationServerHandler.detectProtocol(NettyPortUnificationServerHandler.java:158)
at
org.apache.dubbo.remoting.transport.netty4.NettyPortUnificationServerHandler.decode(NettyPortUnificationServerHandler.java:124)
at
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:529)
at
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:468)
... 17 common frames omitted
```
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