[java] Incorrect code being generated with oneOf

[mukulb90]

Description

[JAVA] Incorrect code generation when subtypes are involved.

openapi-generator version

openapi-generator-cli-3.2.3

OpenAPI declaration file content or url

{
  "openapi": "3.0.1",
  "info": {
    "title": "Mukul",
    "version": "2.0"
  },
  "paths": {
    "/catalog/{id}": {
      "get": {
        "operationId": "getCatalogItem",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "default": {
            "description": "default response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/CatalogEntity"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "CatalogEntity": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "entityType": {
            "type": "string"
          }
        },
        "discriminator": {
          "propertyName": "entityType",
          "mapping": {
            "folder": "#/components/schemas/Folder",
            "source": "#/components/schemas/Source"
          }
        },
        "oneOf": [
          {
            "$ref": "#/components/schemas/Folder"
          },
          {
            "$ref": "#/components/schemas/Source"
          }
        ]
      },
      "Folder": {
        "type": "object",
        "properties": {
          "path": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "tag": {
            "type": "string"
          },
          "children": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/CatalogItem"
            }
          }
        },
        "allOf": [
          {
            "$ref": "#/components/schemas/CatalogEntity"
          }
        ]
      },
      "Source": {
        "type": "object",
        "properties": {
          "tag": {
            "type": "string"
          },
          "type": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "description": {
            "type": "string"
          },
          "createdAt": {
            "type": "string",
            "format": "date-time"
          },
          "children": {
            "type": "array",
            "items": {
              "$ref": "#/components/schemas/CatalogItem"
            }
          }
        },
        "allOf": [
          {
            "$ref": "#/components/schemas/CatalogEntity"
          }
        ]
      }
    }
  }
}

Command line used for generation

java -jar openapi-generator-cli-3.2.3-20180824.092221-7.jar generate -i openapi-apiresource.json -o ./gen -g java

Expectation: Generated classes Space and Source java should extend CatalogEntity and should have properties declared in the json.

Output: It generates classes Spaces and Source and they do extend CatalogEntity but all the props are missing.

For example:-

@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen", date = "2018-08-27T11:13:31.931-07:00[America/Los_Angeles]")
public class Space extends CatalogEntity {

  @Override
  public boolean equals(java.lang.Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    return super.equals(o);
  }

  @Override
  public int hashCode() {
    return Objects.hash(super.hashCode());
  }


  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("class Space {\n");
    sb.append("    ").append(toIndentedString(super.toString())).append("\n");
    sb.append("}");
    return sb.toString();
  }

  /**
   * Convert the given object to string with each line indented by 4 spaces
   * (except the first line).
   */
  private String toIndentedString(java.lang.Object o) {
    if (o == null) {
      return "null";
    }
    return o.toString().replace("\n", "\n    ");
  }

}

[jmini]

Thank you for your report.oneOf is not supported yet. See #15.