Java Language Support

Summary

Feature	Status	Notes
Maintainability	✔	Complexity, duplication, code smells
Linting	✔
Auto-formatting	✔
Custom checks	✔
Security scanning	✔	AppSec, dependencies, and secrets
Code metrics	✔
Code coverage	✔

Details

Maintainability
Complexity	✔	Aka cognitive complexity
Cyclomatic complexity	✔
Identical code duplication	✔
Similar code duplication	✔
Code smells	✔
Linters
Checkstyle	✔	Static code analysis tool
PMD	✔	Source code analyzer
radarlint-java	✔	Static analysis tool
Auto-formatters
google-java-format	✔	Google’s Java formatter
Custom checks
ast-grep	✔
Semgrep	✔
ripgrep	✔
Security scanning
Gitleaks	✔	Secrets scanning
OSV-Scanner	✔	Dependency scanning (SCA)
radarlint-java	✔	AppSec (SAST)
PMD	✔	AppSec (SAST)
Semgrep	✔	AppSec (SAST)
Trivy	✔	Dependency scanning (SCA)
TruffleHog	✔	Secrets scanning
Code coverage
JUnit	✔
JaCoCo coverage format	✔
Cobertura coverage format	✔

File extensions

By default, Java files are defined as:

[file_types.java]
globs = ["*.java"]

These patterns can be overridden from qlty.toml.

Supported Java versions

We officially support Java 8 and later for maintainability checks and code coverage. Each plugin may have its own version requirements.