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Merge branch '2.3.x' into 2.4.x

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Closes gh-26333
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Scott Frederick 2021-04-30 14:15:30 -05:00
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CONTRIBUTING.adoc
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@ -54,111 +54,4 @@ added after the original pull request but before a merge.
== Working with the Code
If you don't have an IDE preference we would recommend that you use https://spring.io/tools[Spring Tool Suite] or https://eclipse.org[Eclipse] when working with the code.
We use the https://projects.eclipse.org/projects/tools.buildship[Buildship] Eclipse plugin for Gradle support.
Other IDEs and tools should also work without issue.
=== Building from Source
Spring Boot source can be built from the command line using https://gradle.org[Gradle] on JDK 1.8 or above.
We include https://docs.gradle.org/current/userguide/gradle_wrapper.html[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:
[indent=0]
----
$ ./gradlew build
----
=== Importing into Eclipse
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).
==== Using the Eclipse Installer
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 https://download.eclipse.org/justj/?file=oomph/products/latest[Eclipse Installer] (must be 1.19.0 or above).
* 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, `2020-12` 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).
==== Manual Installation with Buildship
If you prefer to install Eclipse yourself you should use the https://projects.eclipse.org/projects/tools.buildship[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.
===== Install the Spring Formatter plugin
* Select "`Help`" -> "`Install New Software`".
* Add `https://repo.spring.io/javaformat-eclipse-update-site/` 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.
=== Importing into IntelliJ IDEA
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.
==== Install the Spring Formatter plugin
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 https://search.maven.org/search?q=g:io.spring.javaformat%20AND%20a:spring-javaformat-intellij-idea-plugin[IntelliJ IDEA plugin].
* Select "`IntelliJ IDEA`" -> "`Preferences`".
* Select "`Plugins`".
* Select the wheel and "`Install Plugin from Disk...`".
* Select the jar file you've downloaded.
==== Import additional code style
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.
=== Importing into Other IDEs
Gradle is well supported by most Java IDEs. Refer to your vendor documentation.
== Cloning the git repository on Windows
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
```
For information on editing, building, and testing the code, see the https://github.com/spring-projects/spring-boot/wiki/Working-with-the-Code[Working with the Code] page on the project wiki.