Project Charter


DataNucleus shall be standards driven, implementing all associated persistence specifications, extending into whatever related areas the market demand requires. Initially such implementation will be for java persistence specifications. Further on we will implement the Data Mining API. DataNucleus will support persistence to RDBMS and db4o and LDAP datastores initially, moving into other datastores in the future.


The work of the Project is organized into subprojects. New subprojects must be significant works consistent with the mission of the DataNucleus Project, be recommended by the PMC, and confirmed by the Board. Subprojects can be discontinued by decision of the Board.

When a new subproject is created, the PMC appoints a subproject lead to act as the technical leader and names the initial set of Committers for the subproject. Thereafter the PMC may appoint a new subproject lead from time to time as required, but the new subproject lead must be confirmed by a majority of the other Committers of the subproject. Subproject leads are accountable to the PMC for the success of their project.

Subproject Components

The PMC may decide to divide subproject further into components. If a subproject is divided into components, commit privileges are normally granted at the component level, and the committers for a given component vote on issues specific to that component. Components are established and discontinued by the PMC. When the PMC creates a component it appoints a component lead to act as the technical leader and names the initial set of Committers for the component. The component lead is designated as a committer for the subproject and represents the component in discussions and votes pertaining to the subproject as a whole. Component Committers do not participate in votes at the level of the subproject as a whole, unless they are also the component lead.


Project Management Committee

The DataNucleus Project is managed by a small group known as the DataNucleus Project Management Committee [DataNucleus PMC].

The DataNucleus Project is a meritocracy -- the more you contribute, and the higher the quality of your contribution, the more you are allowed to do. However with this comes increased responsibility. If you do not take on extra responsibilities then your opinion will have less weight in the DataNucleus meritocracy. The DataNucleus Project allows everyone to demonstrate their worth and adopt new responsibilities and have more influence over the development process.


Users are the people who use the products that the Project produces. People in this role aren't contributing code, but they are using the products, reporting bugs, and making feature requests and suggestions. Users are encouraged to participate through the user maillist(s), asking questions, providing suggestions, and helping other users. Users are also encouraged to report problem reports using the bug tracking system.


Users who contribute code or documentation become developers. Developers are the people who contribute code, fixes, documentation, or other work that goes into the product. Developers are also encouraged to participate in the user maillist(s), and should monitor the developer Forum associated with their area of contribution. When appropriate, developers may also contribute to development design discussions related to their area of contribution. Developers are expected to be proactive in reporting problems in the bug tracking system.


Developers who give frequent and valuable contributions to a subproject, or component of a subproject (in the case of large subprojects), can have their status promoted to that of a "Committer" for that subproject or component respectively. A Committer has write access to the source code repository for the associated subproject (or component), and gains voting rights allowing them to affect the future of the subproject (or component).

Active participation in the user maillist and the appropriate developer Forum is a responsibility of all Committers, and is critical to the success of the project. Committers are required to monitor and contribute to the user maillist.

Committers are required to monitor the developer Forum associated with all subprojects and components for which they have commit privileges. This is a condition of being granted commit rights to the subproject or component. It is mandatory because committers must participate in votes (which in some cases require a certain minimum number of votes) and must respond to the Forum in a timely fashion in order to facilitate the smooth operation of the project. When a Committer is granted commit rights they will be added to the appropriate Forum. A Committer must not be unsubscribed from a developer Forum unless their associated commit privileges are also removed.

Committers are required to track, participate in, and vote on, relevant discussions in their associated subprojects and components. There are three voting responses: +1 (yes), -1 (no, or veto), and 0 (abstain).

Committers are responsible for proactively reporting problems in the bug tracking system, and annotating problem reports with status information, explanations, clarifications, or requests for more information from the submitter. Committers are responsible for updating problem reports when they have done work related to the problem.

Architecture Team

The Core, "api.jdo", "store.rdbms" etc will have coordinated release plans, milestone dates, freeze cycles, builds, and ship dates. These subprojects will be coordinated by a group consisting of the subproject leads, the component leads from these subprojects, and the members of the PMC. This group will be called the DataNucleus Project Architecture Team.


The infrastructure required to support the development process is the responsibility of the PMC.

The Development Process

Each subproject lead must produce a development plan for the release cycle, and the development plan must be approved by the PMC and by a majority of Committers of the subproject.

Each subproject must identify, and make available on its web site, the requirements and prioritizations it is working against in the current release cycle. In addition, each subproject must post a release plan showing the date and content of the next major release, including any major milestones, and must keep this plan up to date.

The Committers of a subproject or component decide which changes may be committed to the master code base of a subproject or component respectively. Three +1 ('yes' votes) with no -1 ('no' votes or vetoes) are needed to approve a code change. Vetoes must be followed by an explanation for the veto within 24 hours or the veto becomes invalid. All votes are conducted via the developer Forum associated with the subproject or component.

Special rules may be established for subprojects or components with fewer than three Committers. For efficiency, some code changes from some contributors (e.g. feature additions, bug fixes) may be approved in advance, or approved in principle based on an outline of the work, in which case they may be committed first and changed as needed, with conflicts resolved by majority vote of the Committers of the subproject or component, as applicable. More restrictive rules for releasing changes may be established by the PMC near the end of release cycles or for maintenance streams.

The master copy of the code base must reside on the project web site where it is accessible to all developers and committers. Committers must check their changes and new work into the master code base as promptly as possible (subject to any check-in voting rules that may be in effect) in order to foster collaboration among widely distributed groups and so that the latest work is always available to everyone. The PMC is responsible for establishing a release engineering and build process to ensure that builds can be reliably produced on a regular and frequent basis from the master code base and made available for download from the project web site.

The PMC is responsible for establishing the level of testing appropriate for each subproject, and approving the test plans.

All development technical discussions are conducted using the development Forums. If discussions are held offline, then a summary must be posted to the Forum to keep the other committers informed.