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Hacking_On_WildFly.html
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<title>Hacking on WildFly</title>
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<body id="Hacking_On_WildFly" class="book toc2 toc-left">
<div id="header">
<h1>Hacking on WildFly</h1>
<div class="details">
<span id="author" class="author">WildFly developer team</span><br>
<span id="revnumber">version 33.0.0.Final,</span>
<span id="revdate">2024-07-21T22:12:53Z</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Hacking on WildFly</div>
<ul class="sectlevel1">
<li><a href="#Target_Audience">1. Target Audience</a></li>
<li><a href="#prerequisites">2. Prerequisites</a>
<ul class="sectlevel2">
<li><a href="#github-account">2.1. GitHub account</a></li>
<li><a href="#jira-account">2.2. Jira account</a></li>
</ul>
</li>
<li><a href="#getting-started">3. Getting started</a>
<ul class="sectlevel2">
<li><a href="#fork">3.1. Fork</a></li>
<li><a href="#clone">3.2. Clone</a></li>
<li><a href="#remote">3.3. Remote</a></li>
<li><a href="#safety">3.4. Safety</a></li>
<li><a href="#working-with-git-later">3.5. Working with git later</a></li>
</ul>
</li>
<li><a href="#Contributing">4. Development environment</a></li>
<li><a href="#maven">5. Maven</a></li>
<li><a href="#community-interaction">6. Community interaction</a></li>
<li><a href="#ide-integration">7. IDE Integration</a>
<ul class="sectlevel2">
<li><a href="#eclipse">7.1. Eclipse</a></li>
<li><a href="#intellij-idea">7.2. IntelliJ IDEA</a></li>
</ul>
</li>
<li><a href="#jira">8. Jira</a>
<ul class="sectlevel2">
<li><a href="#good-first-issues">8.1. Good First Issues</a></li>
<li><a href="#special-cases">8.2. Special cases</a></li>
</ul>
</li>
<li><a href="#heaven-coding">9. Heaven - Coding</a>
<ul class="sectlevel2">
<li><a href="#contributing_topic_branch">9.1. Topic branch</a></li>
<li><a href="#code">9.2. Code</a></li>
<li><a href="#contributing_rebase_latest">9.3. Rebase topic branch on latest main</a></li>
</ul>
</li>
<li><a href="#quality-and-testing">10. Quality and Testing</a>
<ul class="sectlevel2">
<li><a href="#checkstyle-errors">10.1. Checkstyle Errors</a></li>
<li><a href="#how-do-i-ensure-that-my-code-does-not-blow-up-the-testsuite">10.2. How do I ensure that my code does not blow up the testsuite?</a></li>
</ul>
</li>
<li><a href="#pull-requests-to-upstream">11. Pull requests to upstream</a></li>
<li><a href="#WildFly_PR_Standard">12. WildFly Pull Request Standards and Guidelines</a>
<ul class="sectlevel2">
<li><a href="#describe-the-pull-request-adequately">12.1. Describe the pull request adequately</a></li>
<li><a href="#make-sure-it-builds-and-tests-pass-first">12.2. Make sure it builds and tests pass first</a></li>
<li><a href="#separate-your-changes-but-not-too-much">12.3. Separate your changes - but not too much</a></li>
<li><a href="#prstandards_avoid_massive">12.4. Avoid massive and/or "stream of consciousness" branches</a></li>
<li><a href="#prstandards_pay_attention">12.5. Pay attention and respond to review comments</a></li>
<li><a href="#dont-get-discouraged">12.6. Don’t get discouraged</a></li>
<li><a href="#you-can-review-code-too">12.7. You can review code too!</a></li>
<li><a href="#on-major-refactorings">12.8. On major refactorings</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>© 2021 The original authors.</p>
</div>
<!-- toc disabled -->
</div>
</div>
<div class="sect1">
<h2 id="Target_Audience"><a class="anchor" href="#Target_Audience"></a><a class="link" href="#Target_Audience">1. Target Audience</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>This document is a guide to the setup of Github, preparing and developing changes and contributing
to WildFly.</p>
</div>
<div class="paragraph">
<p>This guide assumes you know how to deal with the CLI of your OS, for example the Linux bash or MacOS zsh.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="prerequisites"><a class="anchor" href="#prerequisites"></a><a class="link" href="#prerequisites">2. Prerequisites</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>You are very welcome to improve WildFly, please read why:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>How Red Hat deals with OpenSource <a href="https://www.redhat.com/en/resources/open-source-participation-guidelines-overview">Open source participation guidelines</a></p>
</li>
<li>
<p>and the <a href="https://www.contributor-covenant.org/version/2/1/code_of_conduct/">Contributor Covenant Code of Conduct</a></p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="github-account"><a class="anchor" href="#github-account"></a><a class="link" href="#github-account">2.1. GitHub account</a></h3>
<div class="paragraph">
<p>Create a GitHub account if you don’t have one already
<a href="https://docs.github.com/en/get-started/signing-up-for-github/signing-up-for-a-new-github-account">Signing up for a new GitHub account</a></p>
</div>
<div class="paragraph">
<p>Create a Personal Access Token to work with on the command line.
<a href="https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token">Account Security - Creating a personal access token</a></p>
</div>
</div>
<div class="sect2">
<h3 id="jira-account"><a class="anchor" href="#jira-account"></a><a class="link" href="#jira-account">2.2. Jira account</a></h3>
<div class="paragraph">
<p>Create an account for Red Hat’s Jira [<a href="https://issues.redhat.com/" class="bare">https://issues.redhat.com/</a>] Choose "Sign up"</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="getting-started"><a class="anchor" href="#getting-started"></a><a class="link" href="#getting-started">3. Getting started</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="fork"><a class="anchor" href="#fork"></a><a class="link" href="#fork">3.1. Fork</a></h3>
<div class="paragraph">
<p>Fork wildfly repository into your account <a href="https://docs.github.com/en/get-started/quickstart/fork-a-repo">QuickStart - Fork a repo</a></p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/wildfly/wildfly-core/" class="bare">https://github.com/wildfly/wildfly-core/</a></p>
</li>
<li>
<p><a href="https://github.com/wildfly/wildfly/" class="bare">https://github.com/wildfly/wildfly/</a></p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="clone"><a class="anchor" href="#clone"></a><a class="link" href="#clone">3.2. Clone</a></h3>
<div class="paragraph">
<p>Clone your newly forked copy onto your local workspace</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ git clone [email protected]:[your user]/wildfly.git
Cloning into 'wildfly'...
remote: Counting objects: 533023, done.
remote: Compressing objects: 100% (170/170), done.
remote: Total 533023 (delta 60), reused 0 (delta 0), pack-reused 532777
Receiving objects: 100% (533023/533023), 140.25 MiB | 1.75 MiB/s, done.
Resolving deltas: 100% (210143/210143), done.
Checking connectivity... done.
$ cd wildfly</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="remote"><a class="anchor" href="#remote"></a><a class="link" href="#remote">3.3. Remote</a></h3>
<div class="paragraph">
<p>Add a remote ref to upstream, for pulling future updates</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>git remote add upstream [email protected]:wildfly/wildfly.git</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="safety"><a class="anchor" href="#safety"></a><a class="link" href="#safety">3.4. Safety</a></h3>
<div class="paragraph">
<p>As a precaution, disable merge commits to your main</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>git config branch.main.mergeoptions --ff-only</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="working-with-git-later"><a class="anchor" href="#working-with-git-later"></a><a class="link" href="#working-with-git-later">3.5. Working with git later</a></h3>
<div class="sect3">
<h4 id="pulling-updates"><a class="anchor" href="#pulling-updates"></a><a class="link" href="#pulling-updates">3.5.1. Pulling updates</a></h4>
<div class="paragraph">
<p>Pulling later updates from upstream</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ git checkout -f main
$ git pull --rebase upstream main
From github.com:wildfly/wildfly
* branch main -> FETCH_HEAD
Updating 3382570..1fa25df
Fast-forward
{parent => bom}/pom.xml | 70 ++++----------
build/pom.xml | 13 +--
domain/pom.xml | 10 ++
.../src/main/resources/examples/host-example.xml | 2 +-
.../resources/examples/jboss-domain-example.xml | 28 +++---
.../main/resources/schema/jboss-domain-common.xsd | 12 +--
.../main/resources/schema/jboss-domain-host.xsd | 2 +-
domain/src/main/resources/schema/jboss-domain.xsd | 17 ++--
pom.xml | 100 ++++++++++++++++++--
process-manager/pom.xml | 3 +-
10 files changed, 156 insertions(+), 101 deletions(-)
rename {parent => bom}/pom.xml (85%)</code></pre>
</div>
</div>
<div class="paragraph">
<p>(--rebase will automatically move your local commits, if you have any, on top of the latest branch you pull from, you can leave it off if you do not).</p>
</div>
<div class="paragraph">
<p>Best practice is to never add your own commits to your local 'main' branch. Instead create a topic branch from 'main' and add commits to your topic branch. Only use your local 'main' to track the current state of the 'upstream' remote’s 'main' branch.</p>
</div>
<div class="paragraph">
<p>Please note that --rebase is very important if you do have commits. What happens is that when git pull can’t fast forward, it does a merge commit, and a merge commit puts the sucked in changes ON TOP of yours whereas a rebase puts them BELOW yours. In other words a merge commit makes the history a graph, and we prefer a cleaner, easier to follow linear history (hence the rebasing). Further once you do a merge commit it will be difficult to rebase the history before that commit (say you want to combine two commits to one later) as described in <a href="Hacking_On_WildFly.html#contributing_commit_push">"Commit and push"</a>. Luckily the option set in step <a href="#safety">Safety</a> will prevent this from happening.</p>
</div>
<div class="paragraph">
<p>One way to not forget --rebase the rebase option is you may want to create an alias</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code> $ git config --global alias.up "pull --rebase"</code></pre>
</div>
</div>
<div class="paragraph">
<p>and then just use the new alias instead of pull</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ git up upstream main</code></pre>
</div>
</div>
<div class="paragraph">
<p>One last option, which some prefer, is to avoid using pull altogether, and just use fetch + rebase (this is of course more typing)
For some reasons tags are not updated (e.g. not part of an active branch). Update the tags with</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ git fetch --tags upstream</code></pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="rebasing-a-feature-branch"><a class="anchor" href="#rebasing-a-feature-branch"></a><a class="link" href="#rebasing-a-feature-branch">3.5.2. Rebasing a feature branch</a></h4>
<div class="paragraph">
<p>Assume you have a feature branch WFLY-815_upgrade_sample_dep and you have rebased the local main branch to be up to date with upstream main as described before.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>git checkout -f WFLY-815_upgrade_sample_dep
git rebase upstream/main</code></pre>
</div>
</div>
<div class="paragraph">
<p>Do not pull the upstream main to your local feature branch! You’ll be stuck in duplicate commit hell.</p>
</div>
</div>
<div class="sect3">
<h4 id="push"><a class="anchor" href="#push"></a><a class="link" href="#push">3.5.3. Push</a></h4>
<div class="paragraph">
<p>Pushing pulled updates (or local commits if you aren’t using topic branches) to your private github repo (origin)</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ git push
Counting objects: 192, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (44/44), done.
Writing objects: 100% (100/100), 10.67 KiB, done.
Total 100 (delta 47), reused 100 (delta 47)
To [email protected]:[your user]/wildfly.git
3382570..1fa25df main -> main</code></pre>
</div>
</div>
<div class="paragraph">
<p>You might need to say -f to force the changes. Read <a href="Hacking_On_WildFly.html#contributing_topic_branch">Topic Branch</a> though before you do it.</p>
</div>
<div class="paragraph">
<p>If you fetch the tags separately you have to push the tags also. Consider if you need them in your personal GitHub repository.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>git push --tags</code></pre>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="Contributing"><a class="anchor" href="#Contributing"></a><a class="link" href="#Contributing">4. Development environment</a></h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Latest Maven build tool <a href="https://maven.apache.org/" class="bare">https://maven.apache.org/</a></p>
</li>
<li>
<p>OpenJDK 11 (eleven!) You can use any distribution in example Eclipse <a href="https://adoptium.net/" class="bare">https://adoptium.net/</a></p>
</li>
<li>
<p>Eclipse <a href="https://www.eclipse.org/downloads/packages/">Eclipse Download</a> or any other IDE allowing correct source formatting (IntelliJ)</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="maven"><a class="anchor" href="#maven"></a><a class="link" href="#maven">5. Maven</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>Use maven. Simplest is to use the build.sh or build.bat scripts in the root of the source tree. If you don’t use those scripts and use the <code><code>mvn</code></code> command directly, note that WildFly’s root pom will enforce a minimum maven version.</p>
</div>
<div class="paragraph">
<p>Building WildFly requires Java 11 or newer. Make sure you have JAVA_HOME set to point to the JDK11 installation. Build uses Maven 3.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ ./build.sh
.....
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] WildFly: BOM ..................... SUCCESS [1.834s]
[INFO] WildFly: Parent Aggregator ....... SUCCESS [0.022s]
[INFO] WildFly: Domain Core ............. SUCCESS [3.051s]
[INFO] WildFly: Server Manager .......... SUCCESS [0.204s]
[INFO] WildFly: Server .................. SUCCESS [0.283s]
[INFO] WildFly: Domain Controller ....... SUCCESS [0.084s]
[INFO] WildFly: Process Manager ......... SUCCESS [0.314s]
[INFO] WildFly: Remoting ................ SUCCESS [0.390s]
[INFO] WildFly: Build ................... SUCCESS [5.696s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="community-interaction"><a class="anchor" href="#community-interaction"></a><a class="link" href="#community-interaction">6. Community interaction</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>Discuss your planned changes (if you want feedback)</p>
</div>
<div class="ulist">
<ul>
<li>
<p>On mailing list - [<a href="https://lists.jboss.org/mailman/listinfo/wildfly-dev" class="bare">https://lists.jboss.org/mailman/listinfo/wildfly-dev</a>]</p>
</li>
<li>
<p>On Zulip (recommended) - [<a href="https://wildfly.zulipchat.com" class="bare">https://wildfly.zulipchat.com</a>]</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Getting feedback first is recommended before starting on any large-scale work. Large scale could mean many things including a complex change in a focused area, or a simple change made in many different parts of the code base.</p>
</div>
<div class="paragraph">
<p>Getting feedback first is strongly recommended before beginning work on a new feature. Any change that introduces new user-controllable behavior will be regarded as a new feature. Before merging new features we require a larger set of inputs than are required for other types of fixes, including a formal requirements analysis, a more formally considered plan for testing, and appropriate additions to the WildFly documentation. Before getting too far along with a feature it is best to discuss with other WildFly developers what’s needed and how best to ensure those things can be delivered.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="ide-integration"><a class="anchor" href="#ide-integration"></a><a class="link" href="#ide-integration">7. IDE Integration</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="eclipse"><a class="anchor" href="#eclipse"></a><a class="link" href="#eclipse">7.1. Eclipse</a></h3>
<div class="paragraph">
<p>The "formal" rules to format code are based on Eclipse. You can find them here <a href="https://github.com/wildfly/wildfly-core/tree/main/ide-configs/eclipse">WildFly Core IDE Eclipse Configuration</a></p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>in Eclipse go to Window → Preferences → Java → Code Style → Formatter.</p>
</li>
<li>
<p>click Import.</p>
</li>
<li>
<p>select formatting rules which you have downloaded</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Same for cleanup and templates</p>
</div>
</div>
<div class="sect2">
<h3 id="intellij-idea"><a class="anchor" href="#intellij-idea"></a><a class="link" href="#intellij-idea">7.2. IntelliJ IDEA</a></h3>
<div class="sect3">
<h4 id="code-formatter"><a class="anchor" href="#code-formatter"></a><a class="link" href="#code-formatter">7.2.1. Code Formatter</a></h4>
<div class="paragraph">
<p>There is a plugin for IntelliJ to use the Eclipse formatter: <a href="https://github.com/krasa/EclipseCodeFormatter#instructions">Eclipse Code Formatter</a></p>
</div>
</div>
<div class="sect3">
<h4 id="import-wildfly-as-maven-project-in-intellij-idea"><a class="anchor" href="#import-wildfly-as-maven-project-in-intellij-idea"></a><a class="link" href="#import-wildfly-as-maven-project-in-intellij-idea">7.2.2. Import WildFly as Maven project in IntelliJ IDEA</a></h4>
<div class="paragraph">
<p>Before importing you have to set the VM Options of the IntelliJ Maven importer. Please follow this guide <a href="https://www.jetbrains.com/help/idea/maven-importing.html" class="bare">https://www.jetbrains.com/help/idea/maven-importing.html</a> and add <code><code>-DallTests</code></code> to the field <code><code>VM options for importer</code></code>.
This is necessary because the testsuite poms do not contain all necessary modules by default.</p>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="jira"><a class="anchor" href="#jira"></a><a class="link" href="#jira">8. Jira</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p>Make sure there is a JIRA somewhere for the enhancement/fix</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://issues.redhat.com/projects/WFLY" class="bare">https://issues.redhat.com/projects/WFLY</a> (for WildFly)</p>
</li>
<li>
<p><a href="https://issues.redhat.com/projects/WFCORE" class="bare">https://issues.redhat.com/projects/WFCORE</a> (for WildFly Core)</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="good-first-issues"><a class="anchor" href="#good-first-issues"></a><a class="link" href="#good-first-issues">8.1. Good First Issues</a></h3>
<div class="paragraph">
<p>Want to contribute to the WildFly project but aren’t quite sure where to start? Check out our issues with the <a href="https://issues.redhat.com/issues/?filter=12403174">good-first-issue</a> label. These are a triaged set of issues that are great for getting started on our project.</p>
</div>
<div class="paragraph">
<p>Once you have selected an issue you’d like to work on, make sure it’s not already assigned to someone else. If you’ve resolved a WildFly issue before, to assign an issue to yourself, you should be able to simply click on "Start Progress" or Change the assignee by clicking on "Assign to me". This will automatically assign the issue to you. If you haven’t resolved an issue before, please start a thread expressing your interest in the issue in the <a href="https://wildfly.zulipchat.com/#narrow/stream/174184-wildfly-developers">wildfly-developers</a> stream in zulip.</p>
</div>
</div>
<div class="sect2">
<h3 id="special-cases"><a class="anchor" href="#special-cases"></a><a class="link" href="#special-cases">8.2. Special cases</a></h3>
<div class="paragraph">
<p>For component upgrades select this type for the Jira. The title must reflect the library and the new version.
In the description please offer a links to the release notes, the git tag diff.</p>
</div>
<div class="paragraph">
<p>If you are aware that the component upgrade brings a fix for CVE, it’s good to note that in the JIRA title, as later that will make this information more visible in the WildFly release notes.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>Sample title: Upgrade netty.io 4.1.68 (resolves [CVE-2021-37136|https://github.com/advisories/GHSA-grg4-wf29-r9vv], [CVE-2021-37136|https://github.com/advisories/GHSA-grg4-wf29-r9vv])
Jira Body:
Release Notes [https://netty.io/news/2021/09/09/4-1-68-Final.html]
GitDiff [https://github.com/netty/netty/compare/netty-4.1.67.Final...netty-4.1.68.Final]</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="heaven-coding"><a class="anchor" href="#heaven-coding"></a><a class="link" href="#heaven-coding">9. Heaven - Coding</a></h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="contributing_topic_branch"><a class="anchor" href="#contributing_topic_branch"></a><a class="link" href="#contributing_topic_branch">9.1. Topic branch</a></h3>
<div class="paragraph">
<p>Create a simple topic branch to isolate that work</p>
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<pre class="CodeRay highlight nowrap"><code>git checkout -b WFLY-XXXX_my_cool_feature</code></pre>
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