Jenkins

Continuous Integration with Jenkins CI
Jan Riemann und Niklas Lochschmidt

Late Integration is… not good
Can Lead to “Big Bang Integration”

External Project

Master

Integration Deliverable

08. Juni 2011 | Component Technology for Distributed Applications | Niklas Lochschmidt, Jan Riemann 2

Continuous Integration

External Project

Master

§  A software development practice
§  Integrate your work in the project as often as possible
§  At least once a day Deliverable
§  Integration goes alongside the development à continuous
§  Integration is no longer a dreadful (often postponed) event Integration
§  Only possible through automated builds, tests and deployment
§  Leads to better quality and early deliverables

CI Best Practices

§  Maintain a single source repository
§  One team has one repository holding the mainline (trunk)
§  Checkout must include everything needed for the build

§  Automate the build
§  Use a script or a build tool (e.g. Maven)
§  Manage dependencies
§  Make the build fast
§  Show all warnings and errors
§  Fail early


CI Best Practices

§  Make your build self-testing
§  Run tests as part of the build process
§  Provide rapid feedback Integration
§  define a test pipeline with distinct test phases Tests
§  Test in the production clone Unit Tests
Static Code Analysis

§  Automate deployment
§  Always publish the latest tested build
§  Everyone has the same state
§  Could go directly in production (not recommended)

à Automate the entire setup using

What is Jenkins CI?

§  Jenkins is a central build server
§  Written in Java
§  Runs as Servlet in Tomcat or standalone (e.g. Windows Service)

§  Performs „jobs“
§  Configurable
§  Does all the tedious work (checkout, build, test, package, deploy)

§  Adapts to your workflow
§  More than 350 plugins available

§  Jenkins forked from Hudson (Oracle) in January 2011
§  Most Hudson developers switched to Jenkins
§  Oracle donated Hudson to the Eclipse Foundation in May 2011

Repository Contains Everything Needed to
Build the Project

§  CI: Repository contains:
§  Code, Resources
§  NO build products
§  Jenkins supports many common SCM systems like SVN, CVS
§  Automatic checkout/update on build
§  Build on updates in the SCM


Building the Project Relies on External Build
Tools

§  Jenkins relies on external build
tools
§  Many common tools supported -
like Ant, Maven, Ivy (plugins), …
§  Allows to reuse the build scripts
used locally

§  Jenkins builds the project…
§  after another project has been
builded
§  according to a given schedule
§  after code changes in the SCM
§  many other (=> Plugins)


Jenkins Allows to Perform Post-Build Actions

§  If build fails, Jenkins considers job as failed
§  Jenkins allows to perform a number of post-build actions:


Common Test-Frameworks are Supported by
Jenkins

§  Jenkins can use all test frameworks supported by the build tool
§  Has plugins to read and visualize the test results of various frameworks
§  Junit, Checkstyle, Findbugs, Selenium, coverage tools,...


Multiple Test-Sets can be Executed using Jobs

§  Multiphase testing
§  Small tests can be executed after each SCM commit giving fast feedback
§  Time consuming tests can be executed on a nightly basis (e.g. Selenium FF)
§  One job for each set of tests
§  CI: Tests should also happen in a production system clone
§  Tests fail: Jenkins considers project as unstable
§  Otherwise: successfull
§  Keeps history of build status


Jenkins Supports Automatic Deployment

§  Jenkins offers (again) a lot of possibilities to deploy generated artifacts
§  Upload to scm, ftp, folder, …
§  Ideally, the output of a build cycle is a fully running artifact
§  Can serve as a common basis for all developers


Sources

§  Continuous Integration
§  http://martinfowler.com/articles/continuousIntegration.html
§  http://www.se-radio.net/?s=133

§  Jenkins
§  Homepage http://www.jenkins-ci.org
§  Wiki http://wiki.jenkins-ci.org
§  Plugin-List https://wiki.jenkins-ci.org/display/JENKINS/Plugins
§  Github https://github.com/jenkinsci/jenkins
§  Jenkins CI Server http://ci.jenkins-ci.org/
§  Fork from Hudson http://jenkins-ci.org/content/hudsons-future


Get Notified about Failed Builds and Failed
Tests

§  Via Email (Default) or...

...
http://www.pragmaticautomation.com/cgi-bin/pragauto.cgi/Monitor/Devices/BubbleBubbleBuildsInTrouble.rdoc


Integration in Eclipse

§  „Mylyn Builds Connector: Hudson/Jenkins“ in the Mylyn repository
§  Update-Site: http://download.eclipse.org/mylyn/releases/latest


Jenkins Supports Multi-Environment Builds

§  Multi-environment builds
§  Easy to automatically build (and test) the project on many platforms using
slaves
§  Multiplatform testing
§  Jenkins slaves can execute the testsuite on different platforms


Jenkins

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