How to automate coding standards and enforce code coverage, code quality and code security in a Java project.

Goal:

1. Format the code automatically as per Google Java Style Guide.
2. Run test cases in the corresponding maven module and fail the commit, if minimum required code coverage is not met.
3. Run static code analysis on staged files and fail the commit, if there are any critical issues.

Configuration required:
Define below plugins in pom.xml.

1. Define git-build-hook-maven-plugin plugin.
2. Define maven-git-code-format plugin.
3. Define spotbugs-maven-plugin plugin.
4. Create pre-commit.sh file in the root directory of the maven module and give it execute permission by running chmod +x pre-commit.sh

How does it work?

1. Run mvn clean install
   > - During maven life cycle install phase, content of pre-commit.sh will be copied to pre-commit file in .git/hooks directory.
2. When files are committed pre-commit hook will be invoked by git and if the script returns a non zero exit code, commit will be failed.

Reference:

• Pre-commit hooks for maven project. https://github.com/rudikershaw/git-build-hook
• Code formatting as per Google Java StyleGuide.
  • https://github.com/google/google-java-format
  • https://github.com/Cosium/git-code-format-maven-plugin
• Code Coverage Check https://www.eclemma.org/jacoco/
• Code Quality and Code Security: https://spotbugs.readthedocs.io/en/stable/index.html