Spring generator does not pick up examples from the specs

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Spring generator does not pick up examples given in the OAS specs. It returns null instead

openapi-generator version

4.0.0

OpenAPI declaration file content or url

https://gist.github.com/RitwikChatterjee/0790b7611fcb1d723e0ebae18903ddbf

Command line used for generation

openapi-generator generate -i user.oas3.yaml -o ./source -g spring

Steps to reproduce

Calling the API results in null string being returned. I noticed in the generated code that it ignored the example mentioned in the specification file

Related issues/PRs

None

Suggest a fix

Start with the OpenAPI declaration in the linked gist and run the reported openapi-generator command with the Spring generator. Compare the generated output with the examples declared in the specification; the work is done when those examples are reflected instead of producing null values.