Spring Boot is released under the Apache 2.0 license. If you would like to contribute something, or simply want to hack on the code this document should help you get started.
This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to spring-code-of-conduct@pivotal.io.
We use GitHub issues to track bugs and enhancements. If you have a general usage question
please ask on Stack Overflow. The Spring Boot team and the
broader community monitor the spring-boot
tag.
If you are reporting a bug, please help to speed up problem diagnosis by providing as much information as possible. Ideally, that would include a small sample project that reproduces the problem.
If you think you have found a security vulnerability in Spring Boot please DO NOT disclose it publicly until we’ve had a chance to fix it. Please don’t report security vulnerabilities using GitHub issues, instead head over to https://pivotal.io/security and learn how to disclose them responsibly.
Before we accept a non-trivial patch or pull request we will need you to sign the Contributor License Agreement. Signing the contributor’s agreement does not grant anyone commit rights to the main repository, but it does mean that we can accept your contributions, and you will get an author credit if we do. Active contributors might be asked to join the core team, and given the ability to merge pull requests.
None of these is essential for a pull request, but they will all help. They can also be added after the original pull request but before a merge.
We use the Spring JavaFormat project
to apply code formatting conventions. If you use Eclipse and you follow the ‘Importing
into eclipse’ instructions below you should get project specific formatting
automatically. You can also install the
Spring JavaFormat IntelliJ
Plugin or format the code from the Gradle build by running
./gradlew format
. Note that if you have format violations in buildSrc
, you can fix
them by running ./gradlew -p buildSrc format
from the project root directory.
The build includes checkstyle rules for many of our code conventions. Run
./gradlew checkstyleMain checkstyleTest
if you want to check you changes are
compliant.
Make sure all new .java
files to have a simple Javadoc class comment with at least an
@author
tag identifying you, and preferably at least a paragraph on what the class is
for.
Add the ASF license header comment to all new .java
files (copy from existing files
in the project)
Add yourself as an @author
to the .java
files that you modify substantially (more
than cosmetic changes).
Add some Javadocs.
A few unit tests would help a lot as well — someone has to do it.
If no-one else is using your branch, please rebase it against the current master (or other target branch in the main project).
When writing a commit message please follow these conventions,
if you are fixing an existing issue please add Fixes gh-XXXX
at the end of the commit
message (where XXXX
is the issue number).
If you don’t have an IDE preference we would recommend that you use Spring Tools Suite or Eclipse when working with the code. We use the Buildship Eclipse plugin for Gradle support. Other IDEs and tools should also work without issue.
Spring Boot source can be built from the command line using Gradle on
JDK 1.8 or above. We include Gradle’s
wrapper scripts (./gradlew
or gradlew.bat
) that you can run rather than needing to
install Gradle locally.
The project can be built from the root directory using the standard Gradle command:
$ ./gradlew build
You can import the Spring Boot code into any Eclipse 2019-12-based distribution. The
easiest way to setup a new environment is to use the Eclipse Installer with the provided
spring-boot-project.setup
file (in the /eclipse
folder).
Spring Boot includes a .setup
files which can be used with the Eclipse Installer to
provision a new environment. To use the installer:
Download and run the latest Eclipse Installer.
Switch to "Advanced Mode" using the drop down menu on the right.
Select “Eclipse IDE for Java Developers” under “Eclipse.org” as the product to
install, 2019-12
as the product version, and click “next”.
For the “Project” click on “+” to add a new setup file. Select “Github Projects”
and browse for <checkout>/eclipse/spring-boot-project.setup
from your locally cloned
copy of the source code. Click “OK” to add the setup file to the list.
Double-click on “Spring Boot” from the project list to add it to the list that will be provisioned then click “Next”.
Click show all variables and make sure that “Checkout Location” points to the locally cloned source code that you selected earlier. You might also want to pick a different install location here.
Click “Finish” to install the software.
Once complete you should find that a local workspace has been provisioned complete with all required Eclipse plugins. Projects will be grouped into working-sets to make the code easier to navigate.
Tip
|
If you see import errors with com.sun packages make sure you have setup a valid
JavaSE-1.8 environment. From preferences select “Java”, “Installed JREs”,
“Execution Environments” and make sure “JavaSE-1.8” points to a Java 1.8
install (we use AdoptOpenJDK on our CI).
|
If you prefer to install Eclipse yourself you should use the Buildship Eclipse plugin. If you don’t already have Buildship installed it is available from the “Eclipse marketplace”.
Spring Boot includes project specific source formatting settings, in order to have these work with Buildship, we provide an additional Eclipse plugin that you can install:
Select “Help” → “Install New Software”.
Add https://dl.bintray.com/spring/javaformat-eclipse/
as a site.
Install "Spring Java Format".
Note
|
The plugin is optional. Projects can be imported without the plugins, your code changes just won’t be automatically formatted. |
With the requisite Eclipse plugins installed you can select
Gradle → Existing Gradle project
from the File → Import…
menu to import the code.
If you have performed a checkout of this repository already, use “File” → “Open” and
then select the root build.gradle
file to import the code.
Alternatively, you can let IntellIJ IDEA checkout the code for you. Use “File” →
“New” → “Project from Version Control” and
https://github.com/spring-projects/spring-boot
for the URL. Once the checkout has
completed, a pop-up will suggest to open the project.
If you haven’t done so, install the formatter plugin so that proper formatting rules are applied automatically when you reformat code in the IDE.
Download the latest IntelliJ IDEA plugin.
Select “IntelliJ IDEA” → “Preferences”.
Select “Plugins”.
Select the wheel and “Install Plugin from Disk…”.
Select the jar file you’ve downloaded.
The formatter does not cover all rules (such as order of imports) and an additional file needs to be added.
Select “IntelliJ IDEA” → “Preferences”.
Select “Editor” → “Code Style”.
Select the wheel and “Import Scheme” → “IntelliJ IDEA code style XML”.
Select idea/codeStyleConfig.xml
from this repository.
Some files in the git repository may exceed the Windows maximum file path (260
characters), depending on where you clone the repository. If you get Filename too long
errors, set the core.longPaths=true
git option:
git clone -c core.longPaths=true https://github.com/spring-projects/spring-boot
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