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Contributing guide

Want to contribute? Great! We try to make it easy, and all contributions, even the smaller ones, are more than welcome. This includes bug reports, fixes, documentation, examples... But first, read this page (including the small print at the end).

Legal

All original contributions to Quarkus are licensed under the ASL - Apache License, version 2.0 or later, or, if another license is specified as governing the file or directory being modified, such other license.

All contributions are subject to the Developer Certificate of Origin (DCO). The DCO text is also included verbatim in the dco.txt file in the root directory of the repository.

Reporting an issue

This project uses GitHub issues to manage the issues. Open an issue directly in GitHub.

If you believe you found a bug, and it's likely possible, please indicate a way to reproduce it, what you are seeing and what you would expect to see. Don't forget to indicate your Quarkus, Java, Maven/Gradle and GraalVM version.

Before you contribute

To contribute, use GitHub Pull Requests, from your own fork.

Code reviews

All submissions, including submissions by project members, need to be reviewed before being merged.

Continuous Integration

Because we are all humans, and to ensure Quarkus is stable for everyone, all changes must go through Quarkus continuous integration. Quarkus CI is based on GitHub Actions, which means that everyone has the ability to automatically execute CI in their forks as part of the process of making changes. We ask that all non-trivial changes go through this process, so that the contributor gets immediate feedback, while at the same time keeping our CI fast and healthy for everyone.

The process requires only one additional step to enable Actions on your fork (clicking the green button in the actions tab). See the full video walkthrough for more details on how to do this.

Tests and documentation are not optional

Don't forget to include tests in your pull requests. Also don't forget the documentation (reference documentation, javadoc...).

Be sure to test your pull request in:

  1. Java mode
  2. Native mode

Setup

If you have not done so on this machine, you need to:

  • Install Git and configure your GitHub access
  • Install Java SDK (OpenJDK recommended)
  • Install GraalVM
  • Install platform C developer tools:
    • Linux
      • Make sure headers are available on your system (you'll hit 'Basic header file missing (<zlib.h>)' error if they aren't).
        • On Fedora sudo dnf install zlib-devel
        • Otherwise sudo apt-get install libz-dev
    • macOS
      • xcode-select --install
  • Set GRAALVM_HOME to your GraalVM Home directory e.g. /opt/graalvm on Linux or $location/JDK/GraalVM/Contents/Home on macOS

Docker is not strictly necessary: it is used to run the MariaDB and PostgreSQL tests which are not enabled by default. However it is a recommended install if you plan to work on Quarkus JPA support:

IDE Config and Code Style

Quarkus has a strictly enforced code style. Code formatting is done by the Eclipse code formatter, using the config files found in the independent-projects/ide-config directory. By default when you run ./mvnw install the code will be formatted automatically. When submitting a pull request the CI build will fail if running the formatter results in any code changes, so it is recommended that you always run a full Maven build before submitting a pull request.

If you want to run the formatting without doing a full build, you can run ./mvnw process-sources.

Eclipse Setup

Open the Preferences window, and then navigate to Java -> Code Style -> Formatter. Click Import and then select the eclipse-format.xml file in the independent-projects/ide-config directory.

Next navigate to Java -> Code Style -> Organize Imports. Click Import and select the eclipse.importorder file.

IDEA Setup

Open the Preferences window (or Settings depending on your edition) , navigate to Plugins and install the Eclipse Code Formatter Plugin from the Marketplace.

Restart your IDE, open the Preferences (or Settings) window again and navigate to Other Settings -> Eclipse Code Formatter.

Select Use the Eclipse Code Formatter, then change the Eclipse Java Formatter Config File to point to the eclipse-format.xml file in the independent-projects/ide-config directory. Make sure the Optimize Imports box is ticked, and select the eclipse.importorder file as the import order config file.

Build

  • Clone the repository: git clone https://github.com/quarkusio/quarkus.git
  • Navigate to the directory: cd quarkus
  • Set Maven heap to 1.5GB export MAVEN_OPTS="-Xmx1563m"
  • Invoke ./mvnw clean install from the root directory
git clone https://github.com/quarkusio/quarkus.git
cd quarkus
export MAVEN_OPTS="-Xmx1563m"
./mvnw clean install
# Wait... success!

The default build does not create native images, which is quite time consuming.

Note that the full build with all tests is quite slow, you will usually want to build with -DskipTests. This will also skip creation of the integration-test runner jars. If you want to skip tests but still create the runners you can set -DskipTests -Dquarkus.build.skip=false

You can build and test native images in the integration tests supporting it by using ./mvnw install -Dnative.

By default the build will use the native image server. This speeds up the build, but can cause problems due to the cache not being invalidated correctly in some cases. To run a build with a new instance of the server you can use ./mvnw install -Dnative-image.new-server=true.

MicroProfile TCK's

Quarkus has a TCK module in tcks where all the MicroProfile TCK's are set up for you to run if you wish. These include tests to areas like Config, JWT Authentication, Fault Tolerance, Health Checks, Metrics, OpenAPI, OpenTracing, REST Client, Reactive Messaging and Context Propagation.

The TCK module is not part of the main Maven reactor build, but you can enable it and run the TCK tests by activating the Maven Profile -Ptcks. If your work is related to any of these areas, running the TCK's is highly recommended to make sure you are not breaking the project. The TCK's will also run on any Pull Request.

You can either run all of the TCK's or just a subset by executing mvn verify in the tcks module root or each of the submodules. If you wish to run a particular test, you can use Maven -Dtest= property with the fully qualified name of the test class and optionally the method name by using mvn verify -Dtest=fully.qualified.test.class.name#methodName.

Test Coverage

Quarkus uses Jacoco to generate test coverage. If you would like to generate the report run mvn install -Ptest-coverage, then change into the coverage-report directory and run mvn package. The code coverage report will be generated in target/site/jacoco/.

This currently does not work on Windows as it uses a shell script to copy all the classes and files into the code coverage module.

Extensions

Descriptions

Extensions descriptions (in the runtime/pom.xml description or in the YAML quarkus-extension.yaml) are used to describe the extension and are visible in https://code.quarkus.io. Try and pay attention to it. Here are a few recommendation guidelines:

  • keep it relatively short so that no hover is required to read it
  • describe the function over the technology
  • use an action / verb to start the sentence
  • do no conjugate the action verb (Connect foo, not Connects foo nor Connecting foo)
  • connectors (JDBC / reactive) etc tend to start with Connect
  • do not mention Quarkus
  • do not mention extension
  • avoid repeating the extension name

Bad examples and the corresponding good example:

  • "AWS Lambda" (use "Write AWS Lambda functions")
  • "Extension for building container images with Docker" (use "Build container images with Docker")
  • "PostgreSQL database connector" (use "Connect to the PostgreSQL database via JDBC")
  • "Asynchronous messaging for Reactive Streams" (use "Produce and consume messages and implement event driven and data streaming applications")

The small print

This project is an open source project, please act responsibly, be nice, polite and enjoy!

Frequently Asked Questions

  • The Maven build fails with OutOfMemoryException

Set Maven options to use 1.5GB of heap: export MAVEN_OPTS="-Xmx1563m".

  • IntelliJ fails to import Quarkus Maven project with java.lang.OutOfMemoryError: GC overhead limit exceeded

In IntelliJ IDEA (version older than 2019.2) if you see problems in the Maven view claiming java.lang.OutOfMemoryError: GC overhead limit exceeded that means the project import failed.

To fix the issue, you need to update the Maven importing settings:
Build, Execution, Deployment > Build Tools> Maven > Importing > VM options for importer To import Quarkus you need to define the JVM Max Heap Size (E.g. -Xmx1g)

Note As for now, we can't provide a unique Max Heap Size value. We have been reported to require from 768M to more than 3G to import Quarkus properly.

  • Build hangs with DevMojoIT running infinitely
./mvnw clean install
# Wait...
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.192 s - in io.quarkus.maven.it.GenerateConfigIT
[INFO] Running io.quarkus.maven.it.DevMojoIT

DevMojoIT require a few minutes to run but anything more than that is not expected. Make sure that nothing is running on 8080.

  • The native integration test for my extension didn't run in the CI

In the interest of speeding up CI, the native build stage run_native_tests_stage have been split into multiple steps. This means that each new extension needs to be configured explicitly in azure-pipelines.yml to have it's integration tests run in native mode