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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).

Table of contents generated with markdown-toc

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.

Checking an issue is fixed in main

Sometimes a bug has been fixed in the main branch of Quarkus and you want to confirm it is fixed for your own application. Testing the main branch is easy and you have two options:

This is a quick summary to get you to quickly test main. If you are interested in having more details, refer to the Build section and the Usage section.

Using snapshots

Snapshots are published daily so you will have to wait for a snapshot containing the commits you are interested in.

Then just add https://s01.oss.sonatype.org/content/repositories/snapshots as a Maven repository and a plugin repository in your settings xml:

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <profiles>
    <profile>
       <id>quarkus-snapshots</id>
       <repositories>
        <repository>
          <id>quarkus-snapshots-repository</id>
          <url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>quarkus-snapshots-plugin-repository</id>
          <url>https://s01.oss.sonatype.org/content/repositories/snapshots/</url>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>quarkus-snapshots</activeProfile>
  </activeProfiles>
</settings>

You can check the last publication date here: https://s01.oss.sonatype.org/content/repositories/snapshots/io/quarkus/ .

Building main

Just do the following:

git clone [email protected]:quarkusio/quarkus.git
cd quarkus
export MAVEN_OPTS="-Xmx4g"
./mvnw -Dquickly

Wait for a bit and you're done.

Updating the version

When using the main branch, you need to use the group id io.quarkus instead of io.quarkus.platform for both the Quarkus BOM and the Quarkus Maven Plugin.

In a standard Quarkus pom.xml set the quarkus.platform.group-id-property to io.quarkus and the quarkus.platform.version-property to 999-SNAPSHOT to build your application against the locally installed main branch.

You can now test your application.

Before you contribute

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

Also, make sure you have set up your Git authorship correctly:

git config --global user.name "Your Full Name"
git config --global user.email [email protected]

If you use different computers to contribute, please make sure the name is the same on all your computers.

We use this information to acknowledge your contributions in release announcements.

Code reviews

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

Coding Guidelines

  • We decided to disallow @author tags in the Javadoc: they are hard to maintain, especially in a very active project, and we use the Git history to track authorship. GitHub also has this nice page with your contributions. For each major Quarkus release, we also publish the list of contributors in the announcement post.
  • Commits should be atomic and semantic. Please properly squash your pull requests before submitting them. Fixup commits can be used temporarily during the review process but things should be squashed at the end to have meaningful commits. We use merge commits so the GitHub Merge button cannot do that for us. If you don't know how to do that, just ask in your pull request, we will be happy to help!

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.

To keep the caching of non-Quarkus artifacts efficient (speeding up CI), you should occasionally sync the main branch of your fork with main of this repo (e.g. monthly).

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 11+ (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

How to work

Quarkus is a large project and IDEA will have a hard time compiling the whole of it. Before you start coding, make sure to build the project using Maven from the commandline with ./mvnw -Dquickly.

OutOfMemoryError while importing

After creating an IDEA project, the first import might fail with an OutOfMemory error, as the size of the project requires more memory than the IDEA default settings allow.

Note In some IDEA versions the OutOfMemory error goes unreported. So if no error is reported but IDEA is still failing to find symbols or the dependencies are wrong in the imported project, then importing might have failed due to an unreported OutOfMemory exception. One can further investigate this by inspecting the org.jetbrains.idea.maven.server.RemoteMavenServer36 process (or processes) using JConsole.

To fix that, open the Preferences window (or Settings depending on your edition), then navigate to Build, Execution, Deployment > Build Tools > Maven > Importing. In VM options for importer, raise the heap to at least 2 GB; some people reported needing more, e.g. -Xmx8g.

In recent IDEA versions (e.g. 2020.3) this might not work because VM options for importer get ignored when .mvn/jdk.config is present (see IDEA-250160) it disregards the VM options for importer settings. An alternative solution is to go to Help > Edit Custom Properties... and add the following line:

idea.maven.embedder.xmx=8g

After these configurations, you might need to run File -> Invalidate Caches and Restart and then trigger a Reload all Maven projects.

package sun.misc does not exist while building

You may get an error like this during the build:

Error:(46, 56) java: package sun.misc does not exist

To fix this go to Settings > Build, Execution, Deployment > Compiler > Java Compiler and disable Use '--release' option for cross compilation (java 9 and later).

Formatting

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.

Next, disable wildcard imports: navigate to Editor -> Code Style -> Java -> Imports and set Class count to use import with '*' to 999. Do the same with Names count to use static import with '*'.

Build

  • Clone the repository: git clone https://github.com/quarkusio/quarkus.git
  • Navigate to the directory: cd quarkus
  • Set Maven heap to 4GB export MAVEN_OPTS="-Xmx4g"
  • Invoke ./mvnw -Dquickly from the root directory
  • Note: On Windows, it may be necessary to run the build from an elevated shell. If you experience a failed build with the error "A required privilege is not held by the client", this should fix it.
git clone https://github.com/quarkusio/quarkus.git
cd quarkus
export MAVEN_OPTS="-Xmx4g"
./mvnw -Dquickly
# Wait... success!

This build skipped all the tests, native-image builds, documentation generation etc. and used the Maven goals clean install by default. For more details about -Dquickly have a look at the quick-build profile in quarkus-parent (root pom.xml).

Adding -DskipTests=false -DskipITs=false enables the tests. It will take much longer to build but will give you more guarantees on your code.

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

Workflow tips

Due to Quarkus being a large repository, having to rebuild the entire project every time a change is made isn't very productive. The following Maven tips can vastly speed up development when working on a specific extension.

Building all modules of an extension

Let's say you want to make changes to the Jackson extension. This extension contains the deployment, runtime and spi modules which can all be built by executing following command:

./mvnw install -f extensions/jackson/

This command uses the path of the extension on the filesystem to identify it. Moreover, Maven will automatically build all modules in that path recursively.

Building a single module of an extension

Let's say you want to make changes to the deployment module of the Jackson extension. There are two ways to accomplish this task as shown by the following commands:

./mvnw install -f extensions/jackson/deployment

or

./mvnw install --projects 'io.quarkus:quarkus-jackson-deployment'

In this command we use the groupId and artifactId of the module to identify it.

Running a single test

Often you need to run a single test from some Maven module. Say for example you want to run the GreetingResourceTest of the resteasy-jackson Quarkus integration test (which can be found here). One way to accomplish this is by executing the following command:

./mvnw test -f integration-tests/resteasy-jackson/ -Dtest=GreetingResourceTest
Maven Invoker tests

For testing some scenarios, Quarkus uses the Maven Invoker to run tests. For these cases, to run a single test, one needs to use the invoker.test property along with the name of the directory which houses the test project.

For example, in order to only run the MySQL test project of the container-image tests, the Maven command would be:

./mvnw verify -f integration-tests/container-image/maven-invoker-way -Dinvoker.test=container-build-jib-with-mysql

Note that we use the verify goal instead of the test goal because the Maven Invoker is usually bound to the integration-test phase. Furthermore, depending on the actual test being invoked, more options maybe needed (for the specific integration test mentioned above, -Dstart-containers and -Dtest-containers are needed).

Build with multiple threads

The following standard Maven option can be used to build with multiple threads to speed things up (here 0.5 threads per CPU core):

./mvnw install -T0.5C

Please note that running tests in parallel is not supported at the moment!

Don't build any test modules

To omit building currently way over 100 pure test modules, run:

./mvnw install -Dno-test-modules

This can come in handy when you are only interested in the actual "productive" artifacts, e.g. when bisecting.

Automatic incremental build

ℹ️ This feature is currently in testing mode. You're invited to give it a go and please reach out via Zulip or GitHub in case something doesn't work as expected or you have ideas to improve things.

Instead of manually specifying the modules to build as in the previous examples, you can tell gitflow-incremental-builder (GIB) to only build the modules that have been changed or depend on modules that have been changed (downstream). E.g.:

./mvnw install -Dincremental

This will build all modules (and their downstream modules) that have been changed compared to your local main, including untracked and uncommitted changes.

If you just want to build the changes since the last commit on the current branch, you can switch off the branch comparison via -Dgib.disableBranchComparison (or short: -Dgib.dbc).

There are many more configuration options in GIB you can use to customize its behaviour: https://github.com/gitflow-incremental-builder/gitflow-incremental-builder#configuration

Parallel builds (-T...) should work without problems but parallel test execution is not yet supported (in general, not a GIB limitation).

Special case bom-descriptor-json

Without going too much into details (devtools/bom-descriptor-json/pom.xml has more info), you should build this module without -Dincremental if you changed any extension "metadata":

  • Addition/renaming/removal of an extension
  • Any other changes to any quarkus-extension.yaml
Usage by CI

The GitHub Actions based Quarkus CI is using GIB to reduce the average build time of pull request builds and builds of branches in your fork.

CI is using a slighty different GIB config than locally:

For more details see the Get GIB arguments step in .github/workflows/ci-actions-incremental.yml.

Usage

After the build was successful, the artifacts are available in your local Maven repository.

To include them into your project a few things have to be changed.

With Maven

pom.xml

<properties>
    <quarkus-plugin.version>999-SNAPSHOT</quarkus-plugin.version>
    <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
    <quarkus.platform.group-id>io.quarkus</quarkus.platform.group-id>
    <quarkus.platform.version>999-SNAPSHOT</quarkus.platform.version>
    .
    .
    .
</properties>

With Gradle

gradle.properties

quarkusPlatformArtifactId=quarkus-bom
quarkusPluginVersion=999-SNAPSHOT
quarkusPlatformVersion=999-SNAPSHOT
quarkusPlatformGroupId=io.quarkus

settings.gradle

pluginManagement {
    repositories {
        mavenLocal() // add mavenLocal() to first position
        mavenCentral()
        gradlePluginPortal()
    }
    .
    .
    .
}

build.gradle

repositories {
    mavenLocal() // add mavenLocal() to first position
    mavenCentral()
}

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.

If you just need a report for a single module, run mvn install jacoco:report -Ptest-coverage in that module (or with -f ...).

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")

Update dependencies to extensions

When adding a new extension you should run update-extension-dependencies.sh so that special modules like devtools/bom-descriptor-json that are consuming this extension are built after the respective extension. Simply add to your commit the files that were changed by the script.

When removing an extension make sure to also remove all dependencies to it from all pom.xml. It's easy to miss this as long as the extension artifact is still present in your local Maven repository.

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 more memory: export MAVEN_OPTS="-Xmx4g".

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

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

    See section IDEA Setup as there are different possible solutions described.

  • IntelliJ does not recognize the project as a Java 11 project

    In the Maven pane, uncheck the include-jdk-misc and compile-java8-release-flag profiles

  • 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 job native-tests have been split into multiple categories which are run in parallel. This means that each new extension needs to be configured explicitly in native-tests.json to have its integration tests run in native mode.

  • Build aborts complaining about missing (or superfluous) minimal *-deployment dependencies or illegal runtime dependencies

    To ensure a consistent build order, even when building in parallel (./mvnw -T...) or building incrementally/partially (./mvnw -pl...), the build enforces the presence of certain dependencies. If those dependencies are not present, your local build will most likely use possibly outdated artifacts from you local repo and CI build might even fail not finding certain artifacts.

    Just do what the failing enforcer rule is telling you and you should be fine.

  • Build fails with multiple This project has been banned from the build due to previous failures messages

    Just scroll up, there should be an error or warning somewhere. Failing enforcer rules are known to cause such effects and in this case there'll be something like:

    [WARNING] Rule 0: ... failed with message:
...