Apache Maven is needed to compile the code, and a SQL database to house the review metadata. H2 is recommended for development databases, as it requires no external server process.

Get the Source

Create a new client workspace:

  git clone https://gerrit.googlesource.com/gerrit
  cd gerrit

Configuring Eclipse

To use the Eclipse IDE for development, please see Eclipse Setup for more details on how to configure the workspace with the Maven build scripts.


From the command line:

  mvn package

Output executable WAR will be placed in:


Mac OS X

On Mac OS X ensure "Java For Mac OS X 10.5 Upate 4" (or later) has been installed, and that JAVA_HOME is set to "/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home". Check the installed version by running java -version and looking for build 1.6.0_13-b03-211. Versions of Java 6 prior to this version crash during the build due to a bug in the JIT compiler.

Site Initialization

After compiling (above), run Gerrit’s init command to create a testing site for development use:

  java -jar gerrit-war/target/gerrit-*.war init -d ../test_site

Accept defaults by pressing Enter until init completes, or add the --batch command line option to avoid them entirely. It is recommended to change the listen addresses from * to localhost to prevent outside connections from contacting the development instance.

The daemon will automatically start in the background and a web browser will launch to the start page, enabling login via OpenID.

Shutdown the daemon after registering the administrator account through the web interface:

  ../test_site/bin/gerrit.sh stop


Running the Daemon

The daemon can be directly launched from the build area, without copying to the test site:

  java -jar gerrit-war/target/gerrit-*.war daemon -d ../test_site

Querying the Database

The embedded H2 database can be queried and updated from the command line. If the daemon is not currently running:

  java -jar gerrit-war/target/gerrit-*.war gsql -d ../test_site

Or, if it is running and the database is in use, connect over SSH using an administrator user account:

  ssh -p 29418 user@localhost gerrit gsql

Debugging JavaScript

When debugging browser specific issues use -Dgwt.style=DETAILED so the resulting JavaScript more closely matches the Java sources. This can be used to help narrow down what code line 30,400 in the JavaScript happens to be.

  mvn package -Dgwt.style=DETAILED

Release Builds

To create a release build for a production server, or deployment through the download site:


If AsciiDoc isn’t installed or is otherwise unavailable, the WAR can still be built without the embedded documentation by passing an additional flag:

  ./tools/release.sh --without-documentation

Client-Server RPC

The client-server RPC implementation is gwtjsonrpc, not the stock RPC system that comes with GWT. This buys us automatic XSRF protection. It also makes all of the messages readable and writable by any JSON implementation, facilitating "mashups" and 3rd party clients.

The programming API is virtually identical, except service interfaces extend RemoteJsonService instead of RemoteService.

Why GWT?

We like it. Plus we can write Java code once and run it both in the browser and on the server side.

Google Web Toolkit:

Apache Maven:

Apache SSHD:



Part of Gerrit Code Review