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• Java 8 JDK (Oracle Java recommended; OpenJDK is not as thoroughly tested)
• Apache Maven (3.0 and later)
• git
• bash (for packaging & testing)
• Apache Karaf (3.0.2 and later) 

Many of these have installers or packages, or, in the case of Karaf, simply be installed by extracting the tar archives to the desired install location.

Finally, to take full advantage of the ONOS test suite and various developer conveniences, it is also recommended that developers have the following tools available on their machines:

• IDE (IntelliJ, Eclipse, etc.)
• VirtualBox (or other VM hosting software)

Installation - Java, Maven, and

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Karaf

The ONOS install process relies on the environment variable JAVA_HOME being properly set. In other words, both mvn --version and java -version should report the same Java version:

Maven and Karaf

The binaries for both Maven and Karaf can be downloaded as tar archives, where installation entails extracting them to the desired location. For example, if your archives were downloaded to ~/Downloads, and you wish to install Maven and Karaf into ~/Applications:

$ cd Downloads
$ tar -zxvf apache-karaf-3.0.2.tar.gz -C ../Applications/
$ tar -zxvf apache-maven-3.2.2-bin.tar.gz -C ../Applications/

Upgrading to Java 8

For OS X, the latest Oracle Java 8 SDK can be downloaded from Oracle. 

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For deploying ONOS on multiple remote machines (i.e., as a cluster), the behavior of the ONOS utilities can be configured by employing test cells. Test cells are discussed under Test Environment Setup in the Developer's Guide.

If Things go Wrong

Maven and Karaf

Both Maven and Karaf rely on network access for some of their functionality. One of the first points to check if a build fails is to check for connectivity, and rebuild the project once it is restored.

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