NetworkChannel.getOption(...) throws java.lang.AssertionError: Option not found

[Norman Maurer]

Hi,

I just wanted to double check that I am not doing something wrong here.

This code will throw an java.lang.AssertionError: Option not found :


public static void main(String[] args) throws IOException {
    getAllSupportedOptions(DatagramChannel.open());
    getAllSupportedOptions(SocketChannel.open());
    getAllSupportedOptions(ServerSocketChannel.open());
}

private static void getAllSupportedOptions(NetworkChannel channel) throws IOException {
    try {
        for (SocketOption<?> option : channel.supportedOptions()) {
            channel.getOption(option);
        }
    } finally {
        channel.close();
    }
}


It throws for ServerSocketChannel. The option that throws here is IP_TOS which is returned by supportedOptions().

We recently got this reported in netty where we make use of such a pattern:

https://github.com/netty/netty/issues/8182

If this sounds like a bug (I am very confident it is one) I can create an issue. 

This happens on latest java8, 9, 10 and 11 on MacOS. I did not test Linux yet.

As a side-note it would be nice if the AssertionError would have included the option for which it throws.

Thanks,
Norman




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