Java 17 (LTS) support

[aaron-kumar]

As of September 2021, Java 17 is the latest released Java version with long-term support version (LTS). Oracle's JDK 17 - Free Again for Commercial Use. Oracle Java SE 8 LTS discontinue Premier Support (reached End of Life) in March, 2022 but extended support will be there till December 2030

Why Upgrade?

• New Language Features
• New APIs
• Performance Improvements
• Security Improvements
• New supported platforms
• Deprecation and removal

What changes required?

• Replacement of deprecated features and dependencies with new one in all Oxalis Repositories (Oxalis, Oxalis-as4, Vefa-peppol)
• Change in CI/CD pipeline using GitHub
• Docker support for latest Java Version

Estimation:
It is difficult to predict time it will take to fully upgrade all 3 Java repository. First priority is make sure that project compile with latest version, and released using GitHub build pipeline. Replacement of old features with new will be done in due course.

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Oxalis Technical Meeting March 30 Update:
Phase 1 (Roadmap Task OxalisCommunity/Oxalis-internal-roadmap#16): Support running of Oxalis and associated dependencies on Java 17 while keeping compilation dependency on Java 8
Phase 2 (Roadmap Task OxalisCommunity/Oxalis-internal-roadmap#12): Support Java 17 Language features and compile support