swagger-codegen generate Poor error message about something being null ( I guess ): WARN io.swagger.util.PropertyDeserializer - no property from int, null, {ENUM=null, TITLE=null,

Description

Poor error message about something being null ( I guess ).

Should provide line number and possibly column number and maybe something more depending on what the issue is.

I had several of these issues in my real spec but they eventually went way as I kept rewriting to match spec to the requirements. Still have no idea what causes it, sorry.

Cause by incorrect type: int. So I guess this is a variation on https://github.com/swagger-api/swagger-codegen/issues/5160

Swagger-codegen version

current master; HEAD = 1c160df33897898da1c39f230c737eb6a313e6ba

Swagger declaration file content or url

swagger: '2.0'

info:
  title: "sscce"
  version: '1.0'
  description: sscce

definitions:
  Pet:
    type: object
    properties:
      no_legs:
        type: int

      name:
        type: string

  Cat:
    allOf:
    - $ref: "#/definitions/Pet"
    - type: object
      properties:
        likes_water:
          type: boolean


paths:
  /foo:
    post:
      parameters:
        - name: cat
          in: body
          schema: {$ref: "#/definitions/Cat"}
      responses:
        "200":
          description: foo
          type: string

Command line used for generation

JAR=".../swagger-codegen.git/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar"
java -jar "${JAR}" generate -i ~/sscce.yaml -l html2 -o foo

outputs:

[main] INFO io.swagger.parser.Swagger20Parser - reading from sscce.yaml
[main] WARN io.swagger.util.PropertyDeserializer - no property from int, null, {ENUM=null, TITLE=null, DESCRIPTION=null, DEFAULT=null, PATTERN=null, DESCRIMINATOR=null, MIN_ITEMS=null, MAX_ITEMS=null, MIN_PROPERTIES=null, MAX_PROPERTIES=null, MIN_LENGTH=null, MAX_LENGTH=null, MINIMUM=null, MAXIMUM=null, EXCLUSIVE_MINIMUM=null, EXCLUSIVE_MAXIMUM=null, UNIQUE_ITEMS=null, EXAMPLE=null, TYPE=int, FORMAT=null, READ_ONLY=null, VENDOR_EXTENSIONS={}, MULTIPLE_OF=null}
[main] WARN io.swagger.codegen.DefaultCodegen - Empty operationId found for path: post /foo. Renamed to auto-generated operationId: fooPost
[main] INFO io.swagger.codegen.AbstractGenerator - writing file /home/yac/sscce.html/index.html

Fun fact: there is a breed of cats called Bengal cat who like water and they are domesticated by selectively breeding four generations from leopards or such.

Reproduce the warning with the supplied sscce.yaml and swagger-codegen-cli.jar command, then start at io.swagger.util.PropertyDeserializer and the parser output shown in the report. Done should mean an invalid type such as int produces an actionable warning identifying the relevant line and column, with the cause made clear.