@Operation(summary = "Get Something by key", responses = {
			@ApiResponse(description = "Successful Operation", responseCode = "200", content = @Content(mediaType = "application/json", schema = @Schema(oneOf = {
					String.class, Integer.class }), examples = {
					@ExampleObject(name = "The String example", value = "urgheiurgheirghieurg"),
					@ExampleObject(name = "The Integer example", value = "311414") })),
			@ApiResponse(responseCode = "404", description = "Thing not found"),
			@ApiResponse(responseCode = "401", description = "Authentication Failure") })
	@GetMapping(value = "/hello")
	ResponseEntity<Void> sayHello() {
		return null;
	}
Say hello response entity.

@return the response entity
springdoc-openapi-tests/springdoc-openapi-javadoc-tests/src/test/java/test/org/springdoc/api/v30/app6/HelloController.java