Cannot use OpenAPI U/Is to change the greeting message in the MP quickstart

[tjquinno]

Environment Details

• Helidon Version: 1.x, 2.x
• Helidon SE or Helidon MP: MP
• JDK version: n/a
• OS: n/a
• Docker version (if applicable): n/a

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Problem Description

In working with the openapi-ui MP extension (and this is not unique to that extension), the user cannot execute the endpoint to update the greeting correctly because there is no way to provide the new greeting input parameter.

Steps to reproduce

For example, to the 2.x quickstart MP example:

• Comment out the GreetApplication#getClasses method. (See also Update helidon-quickstart-mp to show proper JAX-RS application discovery #1380)
• Add this dependency:

<dependency>
    <groupId>org.microprofile-ext.openapi-ext</groupId>
    <artifactId>openapi-ui</artifactId>
    <version>1.1.2</version>
    <scope>runtime</scope>
</dependency>

• mvn package
• java -jar target/helidon-quickstart-mp.jar
• From a browser access http://localhost:8080/openapi-ui
• Click on the PUT button for /greet/greeting. There is no way to enter the request body JSON for the new greeting message. Clicking Execute yields a server error because the expected request body is missing.

[tjquinno]

Adding this code (with the corresponding imports) to the GreetResource#updateGreeting method resolves the problem:

@RequestBody(name = "greeting",
            required = true,
            content = @Content(mediaType = "application/json",
                    schema = @Schema(type = SchemaType.STRING)))

[tjquinno]

Note that we could add a large number of other OpenAPI annotations to all endpoints in the MP quickstart example so the OpenAPI info is more extensive (descriptions, examples, etc.). But I like the idea of not doing so, keeping the clutter to a minimum. That said, the @RequestBody change above is a necessary bug fix.