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This page describes how release engineering is currently performed for Commons REST (CREST) and the OpenDJ LDAP SDK. Both projects are multi-module Maven projects. Since they are components of other projects it is important that both of them are maintained regularly and released frequently. Therefore, the release engineering process must be as simple and lightweight as possible.

This page is not a guide nor a "best practices": it is just a description of what we are doing currently and any feedback on how we can improve the process is more than welcome. The main purpose is to share the knowledge and hopefully save some time for other projects.

Ok, let's get started...


Many of the tools discussed below are "convention" based and therefore work much better if your Subversion repository conforms to the standard project layout convention of trunk/branches/tags. Deviate at your own risk! Let's look at these in more detail:

  • <project>/trunk

    This is where the most recent (development) version of the project is being developed. I think we all know that, so no more details required. Projects should never be released from the trunk. Instead, a branch should be created first and the release performed from the branch.

    Versioning: the version assigned to the trunk (via the various pom.xml) files is of the form "x.y.0-SNAPSHOT", where "x.y" is greater than the most recent branch.

    Jenkins: we only have a single "post commit" job for the trunk, which is triggered periodically, or when dependencies are updated, or when changes are committed. Release engineering is disabled for this job.
  • <project>/branches/<major>.<minor>

    This is where released, or soon to be released, versions of the project are maintained. Typically changes are cherry picked from the trunk and back-ported to the appropriate branch(es).
  • <project>/tags/<major>.<minor>.<micro>