Generated MP app SimpleGreetResource#getMessage method claims to produce JSON but returns String

[tjquinno]

Environment Details

• Helidon Version: 4.x
• Helidon SE or Helidon MP MP
• JDK version:
• OS:
• Docker version (if applicable):

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Problem Description

Using helidon init for a custom MP app, the generated SimpleGreetResource class contains the getMessage method (the one that accepts a name to greet):

    @Path("/{name}")
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Counted(name = PERSONALIZED_GETS_COUNTER_NAME,
             absolute = true,
             description = PERSONALIZED_GETS_COUNTER_DESCRIPTION)
    @Timed(name = GETS_TIMER_NAME,
           description = GETS_TIMER_DESCRIPTION,
           unit = MetricUnits.SECONDS,
           absolute = true)
    public String getMessage(@PathParam("name") String name) {
        return String.format("Hello %s", name);
    }

The method's annotations say it returns JSON but it actually returns a String (that is not JSON - just the greeting message).

Steps to reproduce

Generate an MP custom app.
Build and run.
curl http://localhost:8080/simple-greet/Anyone

The response content is Hello Anyone, not JSON as claimed by the @Produces annotation and as indicated in the response Content-Type header.