[BUG] [KOTLIN-SPRING] @HttpExchange does not support property placeholders without additional HttpServiceProxyFactory.builder() option during instantiation

[Picazsoo]

@HttpExchange("\${api.base-path:}") does not work and throws: Illegal character in scheme name at index 0: ${api.base-path:}/v1/org/f2c35f32-d086-495f-94da-cda95417a690/devices/58609832-df62-4e73-b611-ff27617c22ac, when invoked.

The problem is that Declarative Restclient Interfaces are not compatible with the Property Placeholder in Spring Boot 4.0. There is no plan to fix this.

There is a workaround for this issue where the actual value can be made to resolve via something akin to:

And this then lets the property placeholder resolve.

But I think the utility of the @HttpExchange with the base path on the class level (@HttpExchange("\${api.base-path:}")) is dubious anyway. I would like to go ahead and change it to only @HttpExchange(BASE_PATH) and simply let the developer choose the base path programatically by avoiding the annotation entirely by setting requestMappingMode to none. With the advantage of leaving the const val BASE_PATH: String = in place and thus making it easy to reference it in the HttpServiceProxyFactory.builder() if one so wishes.

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