[BUG][JAVA] Description

Created by: Ankhell

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

If path to OpenAPI 3 specification file contains spaces you get an error

com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'openapi': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')

Everything generates just fine if there is no spaces and backslashes in path

openapi-generator version

5.0.0

OpenAPI declaration file content or url

openapi: 3.0.1
info:
  title: SOME REST API
  description: SOME REST API
  version: 1.0.3
servers:
  - url: /api
    description: current environment
  - url: http://localhost:8080/api
paths:
  /somePath:
    get:
      responses:
        200:
          description: Request OK.
          content:
            'text/plain':
              schema:
                type: string

Generation Details

java -jar openapi-generator-cli-5.jar generate -i "C:\Idea Projects\dummy\dummy.yml" -g java -o "C:\Idea Projects\dummy\results" --library rest-assured --api-package "com.example.dummy.api" --model-package "com.example.dummy.model" --invoker-package "com.example.dummy.invoker"

everything works fine with java -jar openapi-generator-cli-5.jar generate -i "C:/IdeaProjects/dummy/dummy.yml" -g java -o "C:/IdeaProjects/dummy/results" --library rest-assured --api-package "com.example.dummy.api" --model-package "com.example.dummy.model" --invoker-package "com.example.dummy.invoker"

Steps to reproduce

Try to generate sources from openAPI 3 spec file which path contains spaces or backslashes