Developer Resources


Apache Foundation

Velocity News Feed

Velocity Release Process

Here you will find the steps to create releases for Velocity Engine or Velocity Tools.

Instructions make explicit references to the engine subproject, but you can easily adapt them for the tools subproject.


To create a release you have to install:

One-time operations

These operations need to be performed only one time.

  • Create and publish your GPG key

    To create a GPG key, follow the guidelines. Insert in the file you find on at the directory:


    Publish your GPG key in a PGP key server, such as MIT Keyserver.

  • Create and upload yout SSH key

  • Generate your SSH key (in this case we will use RSA encryption):

    ssh-keygen -t rsa
  • Copy your public key to the server:

    scp ~/.ssh/
  • Try to login:


    If it does not ask you a password, everything is ok.

  • Modify settings.xml

    Your settings.xml must be modified to allow deployment.

    This is the minimal configuration, obviously if you already have a settings.xml file, you must edit it:

    <settings xmlns=""

Repeatable operations

These steps must be performed for each release.

  • Archive the previous release candidate

    If it's not the first release candidate you're trying to release, you should archive the previous release candidate. For instance:

    svn mv ci -m "[engine] archive engine 2.0 RC4"

    And don't forget to also drop the staged artifact.

  • Prepare the release tag

    To prepare the release Subversion tag, check out the branch/trunk from where you are preparing the release and type:

    mvn release:prepare -Dusername=YOUR_SVN_USER -Dpassword=YOUR_SVN_PASSWORD

    The plugin interactively will ask you the version to release, the Subversion tag to use and the next snapshot version. Rather than velocity-engine-parent-X.X (the default), we tend to use X.X for the tag name.

  • Perform the Release

    To perform the release, i.e. creating and deploying Maven artifacts, use:

    mvn release:perform
  • Close the staging repository

    Login to Nexus repository using your Apache LDAP credentials.

    Click on "Staging". Then click on "velocity" in the list of repositories.

    In the panel below you should see an open repository that is linked to your username and ip.

    Right click on this repository and select "Close".

    This will close the repository from future deployments and make it available for others to view.

    If you are staging multiple releases together, skip this step until you have staged everything.

    Enter the name and version of the artifact being released in the "Description" field and then click "Close".

    This will make it easier to identify it later.

  • Verify the staged artifacts

    If you click on your repository, a tree view will appear below.

    You can then browse the contents to ensure the artifacts are as you expect them.

    Pay particular attention to the existence of *.asc (signature) files.

    If you don't like the content of the repository, right click your repository and choose "Drop".

    You can then rollback your release and repeat the process.

    Note the repository URL, you will need this in your vote email.

  • Release the JIRA version

    • In JIRA go to the version that you want to release and release it.

    • Create a new version, if it has not been done before.

    • Create the release notes and write down the link that it uses.

  • Send announcement for the test build

    In **developers mailing list** send an announcement for the test build:
    Subject: [ANNOUNCE] Velocity Engine ${version} test build available
    The test build of Velocity Engine ${version} is available.
    No determination as to the quality ('alpha,' 'beta,' or 'GA') of Velocity Engine ${version} has been made, and at this time it is simply a "test build". We welcome any comments you may have, and will take all feedback into account if a quality vote is called for this build.
    Release notes:
    * ${jira.release.notes}
    Maven 2 staging repository:
    A vote regarding the quality of this test build will be initiated within the next couple of days.
  • Call for a vote

    A few days after the test build announcement, call for a vote in developers mailing list.

    Subject: [VOTE] ${version} Release Quality
    The Velocity Engine ${version} test build has been available since ${testBuildDate}.
    Release notes:
    * ${jira.release.notes}
    Maven 2 staging repository:
    If you have had a chance to review the test build, please respond with a vote on its quality:
     [ ] Leave at test build
     [ ] Alpha
     [ ] Beta
     [ ] General Availability (GA)
    Everyone who has tested the build is invited to vote. Votes by PMC members are considered binding. A vote passes if there are at least three binding +1s and more +1s than -1s.
  • Post-vote operations

    After a vote is finished, and it has been decided that is at least of alpha quality, there is the need of a post-vote process.

    • Promote staged artifacts

    Once the release is deemed fit for public consumption it can be transfered to a production repository where it will be available to all users.

    Login to Nexus repository again.

    Click on "Staging" and then on the repository with id "velocity-staging".

    Find your closed staging repository, right click on it and choose "Promote".

    Select the "Releases" repository and click "Promote".

    Next click on "Repositories", select the "Releases" repository and validate that your artifacts exist as you expect them.

    • Update the site

      Wait 24 hours to let the mirror sync to the release and then update the site. In particular you have to update the index and the download pages:

      Build and publish the site:

      mvn site
      mvn site:deploy
    • Send announcement

      Finally, send an an announcement to the users and developers mailing list:

      Subject: [ANNOUNCE] Velocity Engine ${version} ${quality} released
      The Apache Velocity team is pleased to announce the release of Velocity Engine ${version} ${quality}.
      Velocity Engine ${version} is available in a binary and a source distribution.
      It is also available in the central Maven repository under Group ID "org.apache.velocity".
      The 2.0.x series of the Apache Velocity Engine framework has a minimum
      requirement of the following specification versions:
      * Java Standard Edition (Java SE) 1.6
      The release notes are available online at:
      * ${jira.release.notes}
      Please feel free to test the distribution and post your comments to the user list, or, if appropriate, file a ticket with JIRA.

You have finished!