SonarJava

Cannot be used standalone; requires a SonarQube server, which adds infrastructure and maintenance overhead, limiting flexibility for teams not invested in that ecosystem.

Creating custom rules involves a steep learning curve, as evidenced by the README's recommendation to follow tutorials before implementation, making it less accessible for quick adjustments.

The testing instructions require multiple Java versions (e.g., Java 25, 21, 17) for different modules, complicating local development and contribution efforts.

Recent versions use the Sonar Source-Available License (SSALv1), which is not fully open-source, potentially restricting adoption in environments requiring permissive licenses.