arch4u-pmd

Linting rules for Java frameworks like Spring, Quarkus, Jackson, SLF4J, etc., to avoid known problems in REST API, logging, observability, performance, and general best practices. Maintained by dgroup on GitHub, where it has earned 30 stars from the community.

It's actively developed around java, pmd, pmd-ruleset, and is a solid reference for anyone building with these tools.