Is there any reason it’s more complicated for you than to just do this?

Json.write( get(urlPathMatching("/the/.*/one"))
                .andMatching("path-contains-param", Parameters.one("path", "correct"))
                .willReturn(ok())
                .build())

The plan is/was to see if the conversion could happen from static code (not runtime object instances), and also to find out if there is a reason to implement it in the first place. But, yeah, you are right, it looks quite straightforward and way easier to do what you've just sent. And I've just realized that I didn't account for the fact the a mapping created in Java may produce multiple JSON stub mappings depending on how it is used and how it parametrized.

OK, so you’d click the line marker in a piece of code and it’d give you an HTTP request formed according to the bit of DSL you marked?

Yes. request method, url, body, headers, etc., in the HTTP Client plugin's format. (At the moment, in only that format.)