`@Schema` annotation not picked up when used on another annotation.

[Jaroslav Brtis]

Describe the bug

I created a minimal reproducible example with the latest version of Spring Boot (3.3.0) and springdoc-openapi-starter-webflux-ui (2.5.0).

Let's say I have a large number of endpoints which use parameter personId. I want to document that parameter, but I don't want to copy-paste the doc annotations everywhere. So I created the following annotation:

@Retention(RetentionPolicy.RUNTIME)
@Parameter(description = "Person identifier", example = "1234")
public @interface PersonIdParam {

}

I use the annotation in the following way:

@GetMapping("/person/{id}")
public Mono<PersonDto> getById(@PathVariable @PersonIdParam String id) {
	...
}

This works fine, the description and example is added to every parameter in the generated docs.

But now, I would like to do the same thing for object fields. I created the following annotation:

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Schema(description = "Person identifier", example = "1234")
public @interface PersonIdField {

}

And I use it like this:

public class PersonDto {

	@PersonIdField
	private String id;

	...
}

But this doesn't work. The description and example are not added to the generated docs.

To Reproduce
Steps to reproduce the behavior:

• Clone and run the minimal reproducible example
• Open http://localhost:8080/webjars/swagger-ui/index.html#/person-controller/getById
• The description and example are missing on field PersonDto.id

Expected behavior

• Field PersonDto.id has description and example value.