javax @NotNull annotation makes parameter as requestbody-parameter

[dulong]

Version 2.9.2, the latest version since the issue created.

I think it's a bug.

Actually not only the @NotNull annotation will cause the bug, but also any other annotation which is not a Spring data binding annotation such as @RequstParam, @PathVariable, @RequestPart, and so on.

when

  @ApiOperation(value = "bug2855")
  @RequestMapping(value = "/2855", method = POST, consumes = APPLICATION_FORM_URLENCODED_VALUE)
  public void bug2855(
          @NotNull String a,
          String b) {
  }

expected generated api operation json

{
  "/bugs/2855": {
    "post": {
      "tags": [
        "Bugs"
      ],
      "summary": "bug2855",
      "operationId": "bug2855UsingPOST_1",
      "consumes": [
        "application/x-www-form-urlencoded"
      ],
      "parameters": [
        {
          "in": "formData",
          "name": "a",
          "description": "a",
          "required": true,
          "type": "string"
        },
        {
          "in": "formData",
          "name": "b",
          "description": "b",
          "required": false,
          "type": "string"
        }
      ],
      "responses": {
        "200": {
          "description": "OK"
        }
      },
      "deprecated": false
    }
  }
}

actual

{
  "/bugs/2855": {
    "post": {
      "tags": [
        "Bugs"
      ],
      "summary": "bug2855",
      "operationId": "bug2855UsingPOST_1",
      "consumes": [
        "application/x-www-form-urlencoded"
      ],
      "parameters": [
        {
          "in": "body",
          "name": "a",
          "description": "a",
          "required": true,
          "schema": {
            "type": "string"
          }
        },
        {
          "name": "b",
          "in": "formData",
          "description": "b",
          "required": false,
          "type": "string"
        }
      ],
      "responses": {
        "200": {
          "description": "OK"
        }
      },
      "deprecated": false
    }
  }
}

The difference is the type(the in field) of parameter a.

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