[JAVA] Incompatible types when enum values are hardcoded

[yasensim]

Description

Improper type casting when values are hardcoded inside enum.

Swagger-codegen version

2.2.3

Swagger declaration file content or url

    "swagger": "2.0",
       "X509Certificate": {
            "type": "object",
            "properties": {

                "public_key_length": {
                    "readOnly": true,
                    "enum": [
                        2048,
                        3072
                    ],
                    "type": "integer",
                    "description": "size measured in bits of the public/private keys used in a cryptographic algorithm",
                    "format": "int64"
                }   
		}
	}

Command line used for generation

on MAC OS:
swagger-codegen generate -i test.json -l java

Also with different swagger versions with maven

Result (Generated code)

  /**
   * size measured in bits of the public/private keys used in a cryptographic algorithm
   */
  @JsonAdapter(PublicKeyLengthEnum.Adapter.class)
  public enum PublicKeyLengthEnum {
    NUMBER_2048(2048),
    
    NUMBER_3072(3072);  // these are the problematic lines

    private Long value;

    PublicKeyLengthEnum(Long value) {
      this.value = value;
    }

    public Long getValue() {
      return value;
    }

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

    public static PublicKeyLengthEnum fromValue(String text) {
      for (PublicKeyLengthEnum b : PublicKeyLengthEnum.values()) {
        if (String.valueOf(b.value).equals(text)) {
          return b;
        }
      }
      return null;
    }

    public static class Adapter extends TypeAdapter<PublicKeyLengthEnum> {
      @Override
      public void write(final JsonWriter jsonWriter, final PublicKeyLengthEnum enumeration) throws IOException {
        jsonWriter.value(enumeration.getValue());
      }

      @Override
      public PublicKeyLengthEnum read(final JsonReader jsonReader) throws IOException {
        Long value = jsonReader.nextLong();
        return PublicKeyLengthEnum.fromValue(String.valueOf(value));
      }
    }
  }

  @SerializedName("public_key_length")
  private PublicKeyLengthEnum publicKeyLength = null;

  @SerializedName("not_before")
  private Long notBefore = null;

  @SerializedName("subject")
  private String subject = null;

Compilation failure

[ERROR] /Users/ysimeonov/Documents/workspace/test/target/generated-sources/src/xxx/xxx/xxx/client/model/X509Certificate.java:[134,17] incompatible types: int cannot be converted to java.lang.Long
[ERROR] /Users/ysimeonov/Documents/workspace/test/target/generated-sources/src/xxx/xxx/xxx/client/model/X509Certificate.java:[136,17] incompatible types: int cannot be converted to java.lang.Long
[ERROR] -> [Help 1]

Workaround

I manually modified the following:

    NUMBER_2048(new Long(2048)),
    
    NUMBER_3072(new Long(3072)); 

[dariota]

Looks like a new case is needed here https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java#L1018 to append L to the value when the type is Long.