spring-cloud/spring-cloud-build spring-cloud/spring-cloud-build

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spring-cloud/spring-cloud-build
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spring-cloud

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Repository Details

Common build concerns, shared plugin configuration, etc. for Spring Cloud modules
Build

Spring Cloud Build is a common utility project for Spring Cloud to use for plugin and dependency management.

Building and Deploying

To install locally:

$ mvn install -s .settings.xml

and to deploy snapshots to repo.spring.io:

$ mvn deploy -DaltSnapshotDeploymentRepository=repo.spring.io::default::https://repo.spring.io/snapshot

for a RELEASE build use

$ mvn deploy -DaltReleaseDeploymentRepository=repo.spring.io::default::https://repo.spring.io/release

and for jcenter use

$ mvn deploy -DaltReleaseDeploymentRepository=bintray::default::https://api.bintray.com/maven/spring/jars/org.springframework.cloud:build

and for Maven Central use

$ mvn deploy -P central -DaltReleaseDeploymentRepository=sonatype-nexus-staging::default::https://oss.sonatype.org/service/local/staging/deploy/maven2

(the "central" profile is available for all projects in Spring Cloud and it sets up the gpg jar signing, and the repository has to be specified separately for this project because it is a parent of the starter parent which users in turn have as their own parent).

Contributing

Spring Cloud is released under the non-restrictive Apache 2.0 license, and follows a very standard Github development process, using Github tracker for issues and merging pull requests into master. If you want to contribute even something trivial please do not hesitate, but follow the guidelines below.

Sign the Contributor License Agreement

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.

Code of Conduct

This project adheres to the Contributor Covenant code of conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].

Code Conventions and Housekeeping

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.

  • Use the Spring Framework code format conventions. If you use Eclipse you can import formatter settings using the eclipse-code-formatter.xml file from the Spring Cloud Build project. If using IntelliJ, you can use the Eclipse Code Formatter Plugin to import the same file.

  • 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 and, if you change the namespace, some XSD doc elements.

  • 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).

Checkstyle

Spring Cloud Build comes with a set of checkstyle rules. You can find them in the spring-cloud-build-tools module. The most notable files under the module are:

spring-cloud-build-tools/
└── src
    ├── checkstyle
    │   └── checkstyle-suppressions.xml (3)
    └── main
        └── resources
            ├── checkstyle-header.txt (2)
            └── checkstyle.xml (1)

  1. Default Checkstyle rules

  2. File header setup

  3. Default suppression rules

Checkstyle configuration

Checkstyle rules are disabled by default. To add checkstyle to your project just define the following properties and plugins.

pom.xml
<properties>
<maven-checkstyle-plugin.failsOnError>true</maven-checkstyle-plugin.failsOnError> (1)
        <maven-checkstyle-plugin.failsOnViolation>true
        </maven-checkstyle-plugin.failsOnViolation> (2)
        <maven-checkstyle-plugin.includeTestSourceDirectory>true
        </maven-checkstyle-plugin.includeTestSourceDirectory> (3)
</properties>

<build>
        <plugins>
            <plugin> (4)
                <groupId>io.spring.javaformat</groupId>
                <artifactId>spring-javaformat-maven-plugin</artifactId>
            </plugin>
            <plugin> (5)
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-checkstyle-plugin</artifactId>
            </plugin>
        </plugins>

    <reporting>
        <plugins>
            <plugin> (5)
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-checkstyle-plugin</artifactId>
            </plugin>
        </plugins>
    </reporting>
</build>

  1. Fails the build upon Checkstyle errors

  2. Fails the build upon Checkstyle violations

  3. Checkstyle analyzes also the test sources

  4. Add the Spring Java Format plugin that will reformat your code to pass most of the Checkstyle formatting rules

  5. Add checkstyle plugin to your build and reporting phases

If you need to suppress some rules (e.g. line length needs to be longer), then it’s enough for you to define a file under ${project.root}/src/checkstyle/checkstyle-suppressions.xml with your suppressions. Example:

projectRoot/src/checkstyle/checkstyle-suppresions.xml
<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
		"-//Puppy Crawl//DTD Suppressions 1.1//EN"
		"https://www.puppycrawl.com/dtds/suppressions_1_1.dtd">
<suppressions>
	<suppress files=".*ConfigServerApplication\.java" checks="HideUtilityClassConstructor"/>
	<suppress files=".*ConfigClientWatch\.java" checks="LineLengthCheck"/>
</suppressions>

It’s advisable to copy the ${spring-cloud-build.rootFolder}/.editorconfig and ${spring-cloud-build.rootFolder}/.springformat to your project. That way, some default formatting rules will be applied. You can do so by running this script:

$ curl https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/.editorconfig -o .editorconfig
$ touch .springformat

IDE setup

Intellij IDEA

In order to setup Intellij you should import our coding conventions, inspection profiles and set up the checkstyle plugin. The following files can be found in the Spring Cloud Build project.

spring-cloud-build-tools/
└── src
    ├── checkstyle
    │   └── checkstyle-suppressions.xml (3)
    └── main
        └── resources
            ├── checkstyle-header.txt (2)
            ├── checkstyle.xml (1)
            └── intellij
                ├── Intellij_Project_Defaults.xml (4)
                └── Intellij_Spring_Boot_Java_Conventions.xml (5)

  1. Default Checkstyle rules

  2. File header setup

  3. Default suppression rules

  4. Project defaults for Intellij that apply most of Checkstyle rules

  5. Project style conventions for Intellij that apply most of Checkstyle rules

Code style
Figure 1. Code style

Go to File → Settings → Editor → Code style. There click on the icon next to the Scheme section. There, click on the Import Scheme value and pick the Intellij IDEA code style XML option. Import the spring-cloud-build-tools/src/main/resources/intellij/Intellij_Spring_Boot_Java_Conventions.xml file.

Code style
Figure 2. Inspection profiles

Go to File → Settings → Editor → Inspections. There click on the icon next to the Profile section. There, click on the Import Profile and import the spring-cloud-build-tools/src/main/resources/intellij/Intellij_Project_Defaults.xml file.

Checkstyle

To have Intellij work with Checkstyle, you have to install the Checkstyle plugin. It’s advisable to also install the Assertions2Assertj to automatically convert the JUnit assertions

Checkstyle

Go to File → Settings → Other settings → Checkstyle. There click on the + icon in the Configuration file section. There, you’ll have to define where the checkstyle rules should be picked from. In the image above, we’ve picked the rules from the cloned Spring Cloud Build repository. However, you can point to the Spring Cloud Build’s GitHub repository (e.g. for the checkstyle.xml : https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle.xml). We need to provide the following variables:

Important
 Remember to set the Scan Scope to All sources since we apply checkstyle rules for production and test sources.

Duplicate Finder

Spring Cloud Build brings along the basepom:duplicate-finder-maven-plugin, that enables flagging duplicate and conflicting classes and resources on the java classpath.

Duplicate Finder configuration

Duplicate finder is enabled by default and will run in the verify phase of your Maven build, but it will only take effect in your project if you add the duplicate-finder-maven-plugin to the build section of the projecst’s pom.xml.

pom.xml
<build>
    <plugins>
        <plugin>
            <groupId>org.basepom.maven</groupId>
            <artifactId>duplicate-finder-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

For other properties, we have set defaults as listed in the plugin documentation.

You can easily override them but setting the value of the selected property prefixed with duplicate-finder-maven-plugin. For example, set duplicate-finder-maven-plugin.skip to true in order to skip duplicates check in your build.

If you need to add ignoredClassPatterns or ignoredResourcePatterns to your setup, make sure to add them in the plugin configuration section of your project:

<build>
    <plugins>
        <plugin>
            <groupId>org.basepom.maven</groupId>
            <artifactId>duplicate-finder-maven-plugin</artifactId>
            <configuration>
                <ignoredClassPatterns>
                    <ignoredClassPattern>org.joda.time.base.BaseDateTime</ignoredClassPattern>
                    <ignoredClassPattern>.*module-info</ignoredClassPattern>
                </ignoredClassPatterns>
                <ignoredResourcePatterns>
                    <ignoredResourcePattern>changelog.txt</ignoredResourcePattern>
                </ignoredResourcePatterns>
            </configuration>
        </plugin>
    </plugins>
</build>

Flattening the POMs

To avoid propagating build setup that is required to build a Spring Cloud project, we’re using the maven flatten plugin. It has the advantage of letting you use whatever features you need while publishing "clean" pom to the repository.

In order to add it, add the org.codehaus.mojo:flatten-maven-plugin to your pom.xml.

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>flatten-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

Reusing the documentation

Spring Cloud Build publishes its spring-cloud-build-docs module that contains helpful scripts (e.g. README generation ruby script) and css, xslt and images for the Spring Cloud documentation. If you want to follow the same convention approach of generating documentation just add these plugins to your docs module

<properties>
    <upload-docs-zip.phase>deploy</upload-docs-zip.phase> (8)
</properties>
<profiles>
    <profile>
        <id>docs</id>
        <build>
            <plugins>
                <plugin>
                    <groupId>pl.project13.maven</groupId>
                    <artifactId>git-commit-id-plugin</artifactId> (1)
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-dependency-plugin</artifactId> (2)
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-resources-plugin</artifactId> (3)
                </plugin>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>exec-maven-plugin</artifactId> (4)
                </plugin>
                <plugin>
                    <groupId>org.asciidoctor</groupId>
                    <artifactId>asciidoctor-maven-plugin</artifactId> (5)
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-antrun-plugin</artifactId> (6)
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId> (7)
                </plugin>
            </plugins>
        </build>
    </profile>
</profiles>

  1. This plugin downloads sets up all the git information of the project

  2. This plugin downloads the resources of the spring-cloud-build-docs module

  3. This plugin unpacks the resources of the spring-cloud-build-docs module

  4. This plugin generates an adoc file with all the configuration properties from the classpath

  5. This plugin is required to parse the Asciidoctor documentation

  6. This plugin is required to copy resources into proper final destinations and to generate main README.adoc and to assert that no files use unresolved links

  7. This plugin ensures that the generated zip docs will get published

  8. This property turns on the "deploy" phase for <7>

Important
 The order of plugin declaration is important!

In order for the build to generate the adoc file with all your configuration properties, your docs module should contain all the dependencies on the classpath, that you would want to scan for configuration properties. The file will be output to ${docsModule}/src/main/asciidoc/_configprops.adoc file (configurable via the configprops.path property).

If you want to modify which of the configuration properties are put in the table, you can tweak the configprops.inclusionPattern pattern to include only a subset of the properties (e.g. <configprops.inclusionPattern>spring.sleuth.*</configprops.inclusionPattern>).

Spring Cloud Build Docs comes with a set of attributes for asciidoctor that you can reuse.

<attributes>
    <docinfo>shared</docinfo>
    <allow-uri-read>true</allow-uri-read>
    <nofooter/>
    <toc>left</toc>
    <toc-levels>4</toc-levels>
    <sectlinks>true</sectlinks>
    <sources-root>${project.basedir}/src@</sources-root>
    <asciidoc-sources-root>${project.basedir}/src/main/asciidoc@</asciidoc-sources-root>
    <generated-resources-root>${project.basedir}/target/generated-resources@
    </generated-resources-root>
    <!-- Use this attribute the reference code from another module -->
    <!-- Note the @ at the end, lowering the precedence of the attribute -->
    <project-root>${maven.multiModuleProjectDirectory}@</project-root>
    <!-- It's mandatory for you to pass the docs.main property -->
    <github-repo>${docs.main}@</github-repo>
    <github-project>https://github.com/spring-cloud/${docs.main}@</github-project>
    <github-raw>
        https://raw.githubusercontent.com/spring-cloud/${docs.main}/${github-tag}@
    </github-raw>
    <github-code>https://github.com/spring-cloud/${docs.main}/tree/${github-tag}@
    </github-code>
    <github-issues>https://github.com/spring-cloud/${docs.main}/issues/@</github-issues>
    <github-wiki>https://github.com/spring-cloud/${docs.main}/wiki@</github-wiki>
    <github-master-code>https://github.com/spring-cloud/${docs.main}/tree/master@
    </github-master-code>
    <index-link>${index-link}@</index-link>

    <!-- Spring Cloud specific -->
    <!-- for backward compatibility -->
    <spring-cloud-version>${project.version}@</spring-cloud-version>
    <project-version>${project.version}@</project-version>
    <github-tag>${github-tag}@</github-tag>
    <version-type>${version-type}@</version-type>
    <docs-url>https://docs.spring.io/${docs.main}/docs/${project.version}@</docs-url>
    <raw-docs-url>${github-raw}@</raw-docs-url>
    <project-version>${project.version}@</project-version>
    <project-name>${docs.main}@</project-name>
    <source-highlighter>highlight.js</source-highlighter>
</attributes>

Updating the guides

We assume that your project contains guides under the guides folder.

.
└── guides
	├── gs-guide1
	├── gs-guide2
	└── gs-guide3

This means that the project contains 3 guides that would correspond to the following guides in Spring Guides org.

If you deploy your project with the -Pguides profile like this

$ ./mvnw clean deploy -Pguides

what will happen is that for GA project versions, we will clone gs-guide1, gs-guide2 and gs-guide3 and update their contents with the ones being under your guides project.

You can skip this by either not adding the guides profile, or passing the -DskipGuides system property when the profile is turned on.

You can configure the project version passed to guides via the guides-project.version (defaults to ${project.version}). The phase at which guides get updated can be configured by guides-update.phase (defaults to deploy).

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