List of enums in Android generator results in broken enum definition

Description

List of enums in Android generator results in broken enum definition.

Swagger-codegen version

2.3.1.

Swagger declaration file content or url

      "ApplyCommunicationRecipeResult" : {
         "properties" : {
            "ok" : {
               "type" : "boolean"
            },
            "errors" : {
               "type" : "array",
               "items" : {
                  "type" : "string",
                  "enum" : [
                     "NO_DISCOUNT_OR_BAD_DISCOUNT_TYPE",
                     "HAS_PRODUCT_RELATIONS",
                     "NOT_ONE_INPUT_PRODUCT",
                     "NOT_ONE_OUTPUT_PRODUCT",
                     "NOT_ONE_INPUT_BRAND",
                     "NOT_ONE_OUTPUT_BRAND",
                     "COMMUNICATION_HAS_RULES"
                  ]
               }
            }
         },
         "type" : "object"
      }

Command line used for generation

swagger-codegen generate -i spec.json -l android -o out

Steps to reproduce

Run generator with definition like above. The resulting code will look like

@ApiModel(description = "")
public class ApplyCommunicationRecipeResult {
  
  public enum List<ErrorsEnum> {
     NO_DISCOUNT_OR_BAD_DISCOUNT_TYPE,  HAS_PRODUCT_RELATIONS,  NOT_ONE_INPUT_PRODUCT,  NOT_ONE_OUTPUT_PRODUCT,  NOT_ONE_INPUT_BRAND,  NOT_ONE_OUTPUT_BRAND,  COMMUNICATION_HAS_RULES, 
  };

  @SerializedName("errors")
  private List<ErrorsEnum> errors = null;

  // ...

}

Suggest a fix/enhancement

It works in the Java generator.

Run the swagger-codegen generate -i spec.json -l android -o out command with the declaration and inspect the generated ApplyCommunicationRecipeResult class. Compare the Android output with the Java generator, then verify that the enum declaration is valid Java while the errors field remains a typed list.