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Work In Progress

This page is not yet complete, please ask on the mailing list if anything is unclear or out of date

History and current status

We maintain a (large) number of jobs on the ASF Jenkins instance. Historically, we had a few large reactor builds but those proved to be of limited usefulness:

  • the builds were quite slow to complete - 50 minutes on average
  • if a module in the reactor failed, the whole build failed

In practice, this meant that the Sling CI jobs were red almost all of the time.

To solve these issues we have decided to create individual jobs for each module. Given that Sling has a large number of modules, it is unrealistic to manage them all manually. As such, we have started using the Jenkins Job DSL Plugin . This allows us to programatically create jobs based on a groovy script.


We currently have the following views defined:

  • Sling - holds all Sling jobs
  • Sling-Dashboard - holds all Sling jobs that need attention ( failed, unstable )

Managing jobs

Since all the job management is now done via a Groovy script manual job creation is discouraged. Altering an existing job is also discouraged since the changes will be undone when the jobs are next regenerated.

Jobs are managed by using a 'seed' job, which processes the DSL script. The job is currently located at . Typically there is no need to modify this job.

The script controlling the job management is located at . To add a new job, the module must be available on GitHub and listed in the manifest file at .

Per-job customisations can be applied by creating a Sling module descriptor in the git repository root, see Sling module descriptor for details.

If any of these things change, the seed job must be executed to update the generated jobs.

SNAPSHOT parent versions

Jenkins can usually not resolve parent pom SNAPSHOT versions. The main reason for that is that the SNAPSHOT repo url is only defined in the ASF parent (being itself a parent of the sling-parent). The settings.xml being used on all Jenkins instances does not define that repo url. For a detailed explanation look at  INFRA-15815 - Getting issue details... STATUS .

The following snippet can be added as workaround to the project pom.xml which references a SNAPSHOT parent to be able to build it with Jenkins.

      <name>Apache Snapshot Repository</name> 

Pax-Exam tests with SNAPSHOT dependencies

Pax-Exam tests using SNAPSHOT versions are problematic since they have no way of knowing the general Maven context and they don't obey the custom Maven repositories. As such, we need to manually define the Apache SNAPSHOT repository for those tests. One issue were this was done is SLING-6079 - Getting issue details... STATUS .

If you're using the module, this is already incorporated as of version 0.0.3-SNAPSHOT.

Also, if a Pax-Exam test depends on a SNAPSHOT version of another Sling bundle, the project holding the test will not be rebuilt when a new SNAPSHOT of the included bundle is deployed. This only works if there is a dependency to that bundle and the required version in the pom.xml file.

Testing more complex changes with Docker

If you wish to perform more complex changes, affecting the logic of the script, it's recommended to test these changes on a separate Jenkins instance. This way you minimise the chances that something goes wrong on the ASF Jenkins instance and you get very quick feedback. As of 2016-10-01, a run on sling-seed-build on takes between 10 and 90 minutes.

The fastest way to setup Jenkins locally ( until we fix SLING-6062 - Getting issue details... STATUS ) is to use a local docker instance - provides a Docker image with all the required plugins (as of 2016-10-19) that you can use as follows:

docker build -t jenkins-sling .
export WS=<root of your local sling repo checkout>
docker run -p 8080:8080 -v $WS/tooling-jenkins:/usr/share/jenkins/ref/jobs/SeedJob/workspace/:ro jenkins-sling

And then look at http://localhost:8080/job/SeedJob/ for the seed job execution and http://localhost:8080/ for the list of generated jobs.

That image might not allow you to execute the generated jobs (I haven't tested that so far - patches welcome) but at least verify their generation.

Older Docker test instructions

These instructions allow you to run Jenkins from its official Docker image (which is used as the base image of the above one)

docker run -p 8080:8080 -p 50000:50000 -v `pwd`/data:/var/jenkins_home jenkins

After configuring Jenkins for the first time, perform the following steps:

  1. Install the following plug-ins:
    1. Job DSL plug-in
    2. Javadoc plug-in
    3. Maven plug-in
    4. Test stability plug-in
  2. Configure the following Jenkins tools:
    1. JDK 1.7 (latest)
    2. JDK 1.8 (latest)
    3. Maven 3.3.9
  3. Create a Freestyle job with a Job DSL build step. You can either have it pull from, and run the create_jobs.groovy script, or use an inline script for faster prototyping

If you wish to test the actual job execution, label the master with the "Ubuntu" label. Otherwise, only the seed job will run.


We rely on the Jenkins Maven Plugin to automatically detect relationship between jobs, e.g. from to . However, this does not take into account the provisioning model. To work around this, we currently set up some very broad rules, such as 'all entries under bundles/ or installer/ trigger a launchpad build'. Also, we manually set some dependencies between some of the launchpad testing jobs. We might revisit this to see if we can do something more fine-grained.


  1. Jenkins Job DSL Plugin -
  2. SLING-6061 - Getting issue details... STATUS
  3. - sling ci builds per module :
  4. dev@sling.apache.orgCI alternatives for Sling
  5. - Splitting a large build into _many_ smaller builds :
  6. Multibranch Pipeline recipies
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