Build with JDK 17

[iluwatar]

This task is part of the transition plan at https://github.com/iluwatar/java-design-patterns/wiki/19.-Java-17-transition. Here we address the issues that come up when building the project with JDK 17 using language level Java 11.

Acceptance criteria

• Build the project with JDK 17 while keeping the maven-compiler-plugin language level at 11
• Fix the errors that come up during the build

[harikesh409]

@iluwatar ,
Can I work on this

[iluwatar]

Yes, go ahead @harikesh409

[tylnesh]

Is this already fixed in master branch? I've built the current state against JDK17 and have no errors.

[iluwatar]

For me, it fails during naked objects integration tests

[robertvolkmann]

@iluwatar Could I work on this?

[iluwatar]

@harikesh409 I'll assign @robertvolkmann to this issue as well. This is high priority and would like to see it completed soon.