How to suppress requestBody generation in OpenAPI spec using swagger-maven-plugin

you can hide any parameter including request body via @Parameter.hidden annotation, like:

    @Override
    @GET
    @Operation (
        summary = "Ask something, get something back.",
        parameters = { @Parameter(in = ParameterIn.QUERY, name="TestParam00020", required = true ) }
    )
    public void doGet(@Parameter(hidden = true) HttpServletRequest request, @Parameter(hidden = true) HttpServletResponse response) throws ServletException, IOException {
    }

Did you apply the annotation also to the response? and are you using the latest version?

I suspect you didn't hide the response and you're seeing that in your outcome. As mentioned, the reader is targeting JAX-RS methods, therefore it tries to resolve method parameters if not hidden, and response is a method parameter.

I tested with the code above and request body is correctly not resolved