JAVA-JAXRS parameters validation missing, openapi-generator discrepancy

Description

I am trying to figure out whether it is a good idea to use code generation for java-jaxrs, and which generator to use.
Wanted to understand why these changes in openapi-generator https://github.com/OpenAPITools/openapi-generator/commit/4d32e65c240189e253f9330656c2a9a4add97ba0 are not included in this project, and if those changes are useful how difficult it would be to include.

Swagger-codegen version

3.0.27

Swagger declaration file content or url

Command line used for generation

C:\java\jdk1.8.0_144\bin\java -jar swagger-codegen-cli.jar generate -i file.yml -l jaxrs-jersey -o .\folder `
--additional-properties useBeanValidation=true,date-library=java8

Steps to reproduce

Generate code, look at the service class

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/3862

Suggest a fix/enhancement

Similar to
https://github.com/OpenAPITools/openapi-generator/commit/4d32e65c240189e253f9330656c2a9a4add97ba0

Reproduce the issue with the shown swagger-codegen command and inspect the generated java-jaxrs service class for missing parameter validation. Compare that output with the linked OpenAPI Generator commit and related pull request to determine which changes apply. Done means the discrepancy and a concrete implementation scope are established.