Overview of the issue

Convert usage of Java's Optional to the Kotlin built-in null safety features.

Motivation for or Use Case

As the bulk of the Java code is now migrated to Kotlin we can start fully migrating to Kotlin using more of its built-in features. This might seem as it should have been done already but it was intentionally left out to ease the process of migration(#85) and m

Overview of the feature request

While I was working on my post with JHipster + VueJS side by side, I realized that the VueJS generator does not generate the components with protected properties.

This was also true for some time for Angular, but after some discussion it was merged

jhipster/generator-jhipster#8839

I open this issue to know if there is

Improve and fix the issues reported by SonarCloud; https://sonarcloud.io/dashboard?id=jhipster_jhipster-online