Description

The current Maven build is failing due to the absence of the required Checkstyle configuration file:

[ERROR] Failed during checkstyle execution: Unable to find configuration file at location: checkstyle.xml

To unblock the MVP build and allow ongoing development, the Checkstyle plugin will be temporarily skipped using:

mvn clean install -Dcheckstyle.skip=true

This issue tracks the task of re-enabling Checkstyle after the MVP milestone, restoring code style enforcement across the codebase.

Acceptance Criteria

•  Add or restore a checkstyle.xml file at the project root or in a shared config location.
•  Configure maven-checkstyle-plugin in the pom.xml to reference the config file.
•  Ensure mvn clean install passes without needing to skip Checkstyle.
•  Optionally integrate Checkstyle validation into CI (GitHub Actions, OneDev, etc.).
•  Document the Checkstyle rules and formatting guidelines in CONTRIBUTING.md.

Notes

• We can use the Google Java Style Guide or Spring Java Format as the base style.
• Shall we use a shared ruleset across all Tigase Java projects?
• IntelliJ (I assume we all use IDEAj) formatting can be aligned with Checkstyle via plugins or formatter configs.

Target Milestone

Post-MVP Cleanup / Developer Quality Enhancements

Severity

Low (non-blocking, build workaround available)

Related

• https://checkstyle.org/
• https://maven.apache.org/plugins/maven-checkstyle-plugin/