Java NIO (Netty): Exceptionhandling in Downstream Hanlders/Chain?

If an exception is raised in your handler, it always triggers an upstream exception event. It doesn't matter if the exception was raised by an upstream or a downstream handler.

It looks like SimpleChannelDownstreamHandler doesn't have any exception handling method, as you say. Could you rather use a plain old SimpleChannelHandler, and use a downstream method, like writeRequested(...)? (That is, just move your code to that method).

Then you could use exceptionCaught(...) when it throws an exception.

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