[BUG][JAVA] @Size not generated in the method parameters which are treated as headers

Created by: Chismur

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I'm trying to generate some javax.validation annotations in my generated Spring API files. In the parameters section I use reference to the object. When I try to add a size validation on a parameter by adding minItems or maxItems for example, the generated method does not contain the expected javax.validation @Size annotation

Actual:

@ApiOperation(value = "someValue", nickname = "someNickName", notes = "someNotes", tags={ "someTag", })
    @ApiResponses(value = { 
        @ApiResponse(code = 202, message = "success") })
    @RequestMapping(value = "/someUrl/v1/smth",
        consumes = { "application/json" },
        method = RequestMethod.POST)
    default ResponseEntity<Void> someMethod(@ApiParam(value = "someValueHeaderOne" ,required=true) @RequestHeader(value="HeaderOne", required=true) String headerOne,@ApiParam(value = "someValueHeaderTwo" ,required=true) @RequestHeader(value="HeaderTwo", required=true) UUID headerTwo, @ApiParam(value = "Request Body" ,required=true )  @Valid @RequestBody SomeBody someBody) {
        return getDelegate().someMethod(headerOne, headerTwo, someBody);

Expected:

@ApiOperation(value = "someValue", nickname = "someNickName", notes = "someNotes", tags={ "someTag", })
    @ApiResponses(value = { 
        @ApiResponse(code = 202, message = "success") })
    @RequestMapping(value = "/someUrl/v1/smth",
        consumes = { "application/json" },
        method = RequestMethod.POST)
    default ResponseEntity<Void> someMethod(@ApiParam(value = "someValueHeaderOne" ,required=true) @RequestHeader(value="HeaderOne", required=true) @Size (min=1, max=10) String headerOne,@ApiParam(value = "someValueHeaderTwo" ,required=true) @RequestHeader(value="HeaderTwo", required=true) @Size (min=1, max=10) String headerTwo, @ApiParam(value = "Request Body" ,required=true )  @Valid @RequestBody SomeBody someBody) {
        return getDelegate().someMethod(headerOne, headerTwo, someBody);

When I try this by manually modifying the generated interface, the validation works great and throw errors when I send an empty header

openapi-generator version

4.1.3 (maven plugin). I also tried the 4.3.1 version and the latest version, the result is the same

OpenAPI declaration file content or url

{
  "openapi": "3.0.1",
  "info": {
    "title": "title",
    "description": "description",
    "version": "1.0.0",
    "contact": {
      "name": "name",
      "url": "url",
      "email": "email.com"
    }
  },
  "paths": {
    "/someUrl/v1/smth": {
      "post": {
        "tags": [
          "someMethod"
        ],
        "summary": "summary",
        "description": "description",
        "operationId": "sm",
        "parameters": [
          {
            "$ref": "#/components/parameters/HeaderOne"
          },
          {
            "$ref": "#/components/parameters/HeaderTwo"
          }
        ],
        "requestBody": {
          "description": "Request Body",
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/SomeBody"
              }
            }
          },
          "required": true
        },
        "responses": {
          "202": {
            "description": "success"
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "SomeBody": {
        "type": "object",
        "required": [
          "id"
        ],
        "properties": {
          "id": {
            "type": "string",
            "example": "123",
            "description": "description"
          }
        }
      }
    },
    "parameters": {
      "HeaderOne": {
        "name": "HeaderOne",
        "in": "header",
        "description": "description",
        "required": true,
        "schema": {
          "type": "string",
          "minLength": 1,
          "maxLength": 10
        }
      },
      "HeaderTwo": {
        "name": "HeaderTwo",
        "in": "header",
        "description": "description",
        "required": true,
        "schema": {
          "type": "string",
          "minLength": 1,
          "maxLength": 10
        }
      }
    }
  }
}

Generation Details

                 <execution>
                        <id>generate-sources-client</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/conf/swagger/smth.json</inputSpec>
                            <generatorName>spring</generatorName>
                            <generateApiTests>false</generateApiTests>
                            <generateApiDocumentation>false</generateApiDocumentation>
                            <generateModelTests>false</generateModelTests>
                            <generateModelDocumentation>false</generateModelDocumentation>
                            <apiPackage>${my.package}.api.smth</apiPackage>
                            <modelPackage>${my.package}.api.smth.model</modelPackage>
                            <library>spring-boot</library>
                            <configOptions>
                                <java8>true</java8>
                                <library>resttemplate</library>
                                <library>spring-boot</library>
                                <delegatePattern>true</delegatePattern>
                                <dateLibrary>java8-offsetdatetime</dateLibrary>
                                <performBeanValidation>true</performBeanValidation>
                                <useBeanValidation>true</useBeanValidation>
                                <useTags>true</useTags>
                            </configOptions>
                            <environmentVariables>
                                <supportingFiles>ApiUtil.java</supportingFiles>
                            </environmentVariables>
                        </configuration>
                    </execution>

Related issues/PRs

This could be related to this issue - https://github.com/OpenAPITools/openapi-generator/issues/4122