[JAVA SPRING] Error type generated for enum integer type.

Description

integer type should generate integer output instead of string.

Swagger-codegen version

2.2.2

Swagger declaration file content or url

definitions:
  BaseModel:
    discriminator: baseModelType
    properties:
      code:
        type: integer
        format: int32
        default: 0
        enum: [0, 1]
        description:  0 normal, 1 error.
    required:
      - code
      - baseModelType

Command line used for generation

-l spring --library spring-mvc

Generated Java Model

public class BaseModel   {
  /**
   * 0 normal, 1 error.
   */
  public enum CodeEnum {
    NUMBER_0(0),
    
    NUMBER_1(1);

    private Integer value;

    CodeEnum(Integer value) {
      this.value = value;
    }

    @Override
    @JsonValue
    public String toString() {
      return String.valueOf(value);
    }

which output string json value instead of integer:

{
  "code": "0"
}

Reproduce the issue with the supplied YAML and the command -l spring --library spring-mvc, then inspect the generated BaseModel.CodeEnum shown in the report. Done means the enum's JSON output is numeric, producing {"code": 0} rather than a quoted string.