Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
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README.md

Members chat: Contributors chat:

Checkstyle is a tool for checking Java source code for adherence to a Code Standard or set of validation rules (best practices).

The latest release version can be found at SourceForge downloads or at Maven repo.

Each-commit builds of maven artifacts can be found at Maven Snapshot repository.

Documentation is available in HTML format, see http://checkstyle.sourceforge.net/checks.html.

Continuous integration and Quality reports

Travis (Linux & MacOS build): Appveyor (Windows build): Distelli CI

Quality reports: http://checkstyle.sourceforge.net/project-reports.html

JavaScript, CSS and Java source file analysis on Codacy:

Feedback/Support

Please send any feedback to https://groups.google.com/forum/?hl=en#!forum/checkstyle

Questions and Answers from community:

Bugs and Feature requests (not the questions): https://github.com/checkstyle/checkstyle/issues

Licensing

This software is licensed under the terms in the file named "LICENSE" in this directory.

The software uses the ANTLR package (http://www.antlr.org/). Its license terms are in the file named "RIGHTS.antlr" in this directory.

This product includes software developed by The Apache Software Foundation (http://www.apache.org/).

The software uses the Cli, Logging and Beanutils packages from the Apache Commons project (http://commons.apache.org/). The license terms of these packages are in the file named "LICENSE.apache20" in this directory.

The software uses the Google Guava Libraries (https://code.google.com/p/guava-libraries/). The license terms of these packages are in the file named "LICENSE.apache20" in this directory.