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We have moved to GIT. This means that anything you may find elsewhere on the site about SVN is no longer valid!

The documentation will be updated over the next few days and weeks but if you find anything that is really misleading then please send a message to the developer list at:

Probably the best GIT tutorial on the planet can be found here: - This is a great reference for both existing and new GIT users. Please take a look.

GIT Information for Everyone

You can browse the source code via the web interface.

If you intend to hack on TomEE then it is recommended that you create a GitHub Account and fork the TomEE repository so that you can submit pull requests (See below).

If you just want to build the source version then you can download (aka clone) the sources of Apache TomEE with a GIT client from the following URL - The 'master' branch is the current development branch.

Performing the checkout from a command line using the GIT client (recommended) is as easy as executing the following command:

git clone tomee

If you want to checkout a specific branch then you can just change that in the command:

git clone -b tomee-1.7.x tomee-1.7.x

Or alternatively with Apache Maven 3.0.5 or later:

mvn scm:checkout -DconnectionUrl=scm:git: -DcheckoutDirectory=tomee
This method does not require the GIT client.

GIT Information for TomEE Contributors

Please read our own detailed GitFlow workflow information here

We will be using the Gitflow Workflow from day one. Please read and understand how this works.

See here for information on pull requests.

The official Apache Committer documentation can be found here


To build the code, you’ll need to grab a copy of Apache Maven, version 3.0.5 or later.

Memory Settings

It is pretty much guaranteed that you will need to give Maven an increase on the available memory. + Depending on the OS you are working on the fix can be as easy as (Note: -XX:MaxPermSize=256M is ignored by Java 8):

export MAVEN_OPTS="-Xmx768m -XX:MaxPermSize=256M -XX:ReservedCodeCacheSize=64m -Xss2048k"

on MacOS and Unices or

set "MAVEN_OPTS=-Xmx768m -XX:MaxPermSize=256M -XX:ReservedCodeCacheSize=64m -Xss2048k"

on MS Windows.

Full Build

A fast build that skips all tests, generates no reports and creates full distribution archives is as follows:

mvn -Dsurefire.useFile=false -DdisableXmlReport=true -DuniqueVersion=false -ff -Dassemble -DskipTests -DfailIfNoTests=false clean install

The full build with tests takes around 2 hours:

mvn -Dassemble clean install

The output of those commands should end with "BUILD SUCCESSFUL"

It is of course possible to just compile and test individual modules. Just change to the module directory and run the same commands as above.

Quick Build

If you are in real a hurry (and let’s face it most of us are) you can run a quick build without the examples using the quick profile:

mvn -Pquick -Dsurefire.useFile=false -DdisableXmlReport=true -DuniqueVersion=false -ff -Dassemble -DskipTests -DfailIfNoTests=false clean install

Binary locations

Once built, the TomEE binaries will be located at:

ls [project]/tomee/apache-tomee/target/*.zip


The OpenEJB standalone binaries will be located at:

ls [project]/assembly/openejb-standalone/target/*.zip