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From Karl Pauls <>
Subject [VOTE] Accept Apache Ace into the Incubator
Date Sun, 19 Apr 2009 15:35:19 GMT
Please vote on accepting Apache Ace for incubation at the Apache
Incubator. The full proposal is available at the end of this message
and as a wiki page at We
ask the Incubator PMC to sponsor it, with Karl as the Champion, and
Carsten, Niclas and Bertrand volunteering to be mentors.

Please cast your votes:

[ ]  +1, bring Ace into Incubator
[ ]  +0, I don't care either way,
[ ]  -1, do not bring Ace into Incubator, because...

The vote is open for the next 72 hours and only votes from the
Incubator PMC are binding.

- - - - - - - - - -


Apache Ace is a software distribution framework based on OSGi that
allows you to manage and distribute artifacts, like e.g. software


Apache Ace is a software distribution framework that allows you to
centrally manage and distribute software components, configuration
data and other artifacts to target systems. It is built using OSGi and
can be deployed in different topologies. The target systems are
usually also OSGi based, but don't have to be.


When assembling software out of reusable components, the task of
deploying software onto an ever increasing number of targets is not
trivial to solve. This becomes even harder when these targets require
different components based on who's using them.

A key technology in the Java space for developing component based
applications is OSGi. The OSGi speciļ¬cation, which has been around
since 1999 and by now has matured into the de facto module system for
Java, allows you to write components that can interact through
services and that allows components to be updated individually,
without disturbing the rest of the components.

Although the OSGi speciļ¬cation describes how software distribution
should be done, it does not actually prescribe any protocols or
implementations. Apache Ace implements a software distribution system
based on, but not limited to OSGi. It is setup so it can deal with
different target types, using different protocols. Also, it can handle
an extensible number of artifact types (bundles, configurations,
resources, ...).


When you start using OSGi to build reusable components, the task of
managing those components and their use in various applications
becomes non-trivial. Apache Ace allows you to group those components
and assign them to a managed set of targets. This allows you to
distribute updates and new components easily, while keeping a full
history of what was installed where during what period. It also helps
you setup an automated development, QA/testing, staging and production

Initial Goals

The initial goals for Apache Ace are:

* Donate the existing codebase and import it.
* Setup the incubation infrastructure (svn repository, build system,
website) so we can run continuous builds with automated tests and
publish all available documentation.
* Get people involved in advancing the code base in different
directions, integrating it with other projects at Apache.
* Prepare for an initial release that demonstrates the systems core
* Present the project to the community at ApacheCon 2009 US.

Current Status

The current codebase is developed and tested in various
configurations. It was developed at luminis over the last couple of
years using Scrum, so we have internally demonstrated we can release
often and produce working code using a transparent process.
Documentation for the project is now available on an internal wiki,
which can be donated and converted to the Apache Ace website. We did
not yet use mailing lists as the primary colaborative process, as the
whole team met face to face on a daily basis.


Some of the core developers are already committers and PMC members at
Apache, so they understand what it means to have a process based on


In the past, luminis has been talking to various interested users and
developers about Apache Ace, and we believe there is an interest in
this project. Feedback at ApacheCon EU 2009 and afterwards on the
Apache Felix mailing list confirmed that. The problem that is being
solved is one that many software developers run into, so it should
appeal to them. Our list of initial committers already includes people
from different backgrounds.

Core Developers

The core development team is a mix of people that work for luminis and
have been involved in the project up til now and new committers, some
of which have previous experience at Apache.


The initial codebase makes use of Apache Felix as its core framework.
It also uses various other components of that project. As a project
that builds on components we are constantly looking out for existing
components that can accelerate our implementation and we want to
actively work with other projects to make that happen. For building
and testing we use Apache Ant and have developed a couple of
extensions that help managing OSGi projects. Finally, at least
informally a couple of projects at Apache have already expressed
interest in a system that can help them do software provisioning.

Known Risks

Apache Ace uses Felix as its default OSGi implementation and some of
its developers are also part of the Felix community. We are open to
collaborate with other Apache projects, looking at candidates such as
Commons, Sling, JackRabbit that could help us in certain parts of our

An important reason for open sourcing this project at Apache is the
strong community, as well as the Apache license. This will attract
more users and developers so the project can be moved forward into new
directions that we would otherwise not have been possible. Judging
from the initial interest from some of the other projects at Apache,
we certainly see ways in which to collaborate and advance the project,
possibly in ways we would never have thought of. However, we have been
able to support and develop this product outside of Apache quite well,
so in no way are we trying to just dump the code there or merely
trying to generate publicity.

Initial Source

Apache Ace has been in development within luminis since 2005.

Source and Intellectual Property Submission Plan

The current codebase is owned by luminis, and will be donated together
with its documentation. We will get the paperwork out of the way as
soon as possible. There should already be a CCLA on file for luminis
and the people that are already involved with Apache obviously have
ICLAs on file.

External Dependencies

There are quite a few open source libraries already used. The
libraries, their sources and licenses are listed here:

Apache Felix, ASL:
* framework
* shell
* shell-tui
* obr
* http.jetty
* config admin
* event admin
* deployment admin
* dependency manager
* prefs
* upnp.basedriver
* core
* compendium
* javax.servlet

Apache Ant, ASL:
* ant.jar
* ant-contrib.jar

Apache Velocity, ASL:
* velocity

KXML2 (, BSD license:
* kxml2 (hmm, what was that issue we had with that in felix)

Knopflerfish (, BSD style license:
* log_all.jar, useradmin_all.jar

Luminis Open Source Server (, BSD license:

XStream (, BSD license:
* various xstream jars

Required Resources

Mailing lists:
* ace-private
* ace-dev
* ace-commits
* ace-user (only after leaving the incubator)


Issue Tracking:
* JIRA: Apache Ace (ACE)

* Confluence: Apache Ace (ACE)

Initial Committers

These existing Apache committers have either worked on the initial
codebase (Christian, Karl and Marcel) or expressed an interest in
extending the project:
* Marcel Offermans
* Karl Pauls
* Christian van Spaandonk
* Clement Escoffier
* Felix Meschberger
* Carsten Ziegeler

Community Members

The following people have already expressed their interest in actively
participating in this project:
* Bram de Kruijff
* Toni Menzel
* Alin Dreghiciu
* Dennis Geurts


For the record, Marcel Offermans, Christian van Spaandonk and Dennis
Geurts work at luminis and might get paid to do certain work on Apache


We have approached both the champion and an initial list of mentors
that have agreed to mentor this project.

* Karl Pauls

* Carsten Ziegeler
* Niclas Hedhman
* Bertrand Delacretaz

* Apache Incubator

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