[FIXED] @Parameter(required = false) not working in swagger open api v3

Issue

my project is java spring boot 2 with maven . I use springdoc-openapi-ui dependency. problem is @Parameter(required = false) not working on my api params. src="https://i.stack.imgur.com/kOT7k.png" alt="enter image description here" />

Solution

I don't know how much of swagger annotations Springdoc-openapi supports but according to its own example at PetApiDemo in /findByStatus or /findByTags endpoints you can see by applying @RequestParam(required = false) which is a Spring Annotation! a parameter has become optional.

import org.springframework.web.bind.annotation.RequestParam;
default ResponseEntity<List<Pet>> findPetsByStatus(
        @Parameter(
                explode = Explode.TRUE, 
                name = "status", 
                in = ParameterIn.QUERY, 
                description = "Status values that need to be considered for filter", 
                style = ParameterStyle.FORM, 
                schema = @Schema(
                        type = "string", defaultValue = "available", 
                        allowableValues = {"available", "pending", "sold"}
                )
        )
        @Valid @RequestParam(value = "status", required = false)
        List<String> status) {
    return getDelegate().findPetsByStatus(status);
}

Answered By - Milad Amery
Answer Checked By - Mary Flores (JavaFixing Volunteer)