Codacy
Static analysis and quality gates for engineering teams.
Open-Source Projects
Discover top open-source software, updated regularly with real-world adoption signals.
Discover top open-source software, updated regularly with real-world adoption signals.
Enforce Java coding standards automatically across your codebase
Checkstyle validates Java source files against configurable style rules, providing CLI and Maven integration, detailed reports, and community support to maintain consistent code quality.
Checkstyle is a static analysis tool that helps Java teams enforce coding standards and best‑practice guidelines. It is suited for developers, build engineers, and quality assurance professionals who need a reliable way to keep codebases consistent.
The tool offers a rich set of configurable checks, from naming conventions to complex control‑flow rules like fall‑through detection. It can be run from the command line or integrated directly into Maven builds, producing clear error reports that fit into CI pipelines. Comprehensive HTML documentation and Javadoc are available, and the project is supported through discussions, Stack Overflow, and a Discord community.
Maintained by volunteers under the GNU LGPL v2.1, Checkstyle leverages libraries such as ANTLR, Apache Commons, Guava, and Picocli. Regular CI testing across multiple platforms ensures stability for production use.
When teams consider Checkstyle, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
Continuous Integration Enforcement
Fail builds when code violates configured style rules, ensuring only compliant code is merged.
Legacy Code Auditing
Generate comprehensive reports to identify and prioritize style violations across an existing codebase.
Educational Code Reviews
Provide students with clear feedback on coding standards, fostering best‑practice habits.
Custom Rule Development
Extend the default rule set to enforce organization‑specific conventions.
Download the latest JAR, create a configuration XML, and execute `java -jar checkstyle-<version>-all.jar -c <config.xml> <source files>`.
Yes, add the `checkstyle` plugin to your `pom.xml` and configure the `configLocation` to point to your rules file.
Edit the configuration XML to include, modify, or exclude modules; each check can be tuned with properties.
Checkstyle is released under the GNU LGPL v2.1 license.
Project at a glance
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