swagger-parser-v3 fails to parse Open API with relative paths

Version 2.0.0-rc3

io.swagger.parser.v3:swagger-parser-v3 fails to parse/load Open API v3 file that has relative paths. Here is an example:

paths:
/JTasker/startRun:
post:
tags:

• JTasker
  summary: Start JTasker Run
  operationId: JTasker_startRun
  requestBody:
  content:
  application/json:
  schema:
  $ref: './resources/urn_jsonschema_com_issinc_odin_display_CreatePlan.json'
  required: true
  responses:
  '200':
  description: Success
  content:
  application/json:
  schema:
  type: array
  items:
  type: string
  '500':
  description: Server Error

The problem is that ClasspathHelper cannot load the child resource './resources/urn_jsonschema_com_issinc_odin_display_CreatePlan.json'. The problem is very clear when you look at the code.

ClasspathHelper#loadFileFromClasspath(String location) where location is './resources/urn_jsonschema_com_issinc_odin_display_CreatePlan.json'. That obviously can't find the file because that is not the correct path for loading from the class path. In our case the correct path would be '/webroot/resources/urn_jsonschema_com_issinc_odin_display_CreatePlan.json'.

Start with swagger-parser-v3 and inspect ClasspathHelper#loadFileFromClasspath(String), using the relative ./resources/... reference in the issue as the reproduction case. Trace how child resources are resolved and verify the parser can load the referenced file from the appropriate classpath location, such as /webroot/resources/....