Add support for variable/property expansion in @Input/@Output @StreamListener annotations

I have a need to do this:

@Output("${my.prop.name}")
    public MessageChannel myOutboundChannel();

But KafkaMessageChannelBinder receives the raw value, not replaced w/ the system/app property and dies here:

public static void validateTopicName(String topicName) {
        try {
            byte[] utf8 = topicName.getBytes("UTF-8");
            for (byte b : utf8) {
                if (!((b >= 'a') && (b <= 'z') || (b >= 'A') && (b <= 'Z') || (b >= '0') && (b <= '9') || (b == '.')
                        || (b == '-') || (b == '_'))) {
                    throw new IllegalArgumentException(
                            "Topic name can only have ASCII alphanumerics, '.', '_' and '-'");
                }
            }
        }
        catch (UnsupportedEncodingException e) {
            throw new AssertionError(e); // Can't happen
        }
    }

[bitsofinfo]

I understand those other options, its just that I’m trying to create a re-usable component someone can drop in their app. The channel name itself can vary in each app that uses an instance of this component. Hence I need that configurable rather than hardwired.

[olegz]

Closing it due to the age if the issue and the amount of changes that went in after that. If you feel you still need this feature please raise a new issue taking into account latest functionality