Install Java SE Development Kit (JDK)

On your assembly-host and engine-host(s), while logged in as root, download and install Java SE development kit (JDK), version 7.

You can download the JDK from Follow the installation instructions supplied on the Oracle site. When you have installed it you need to make sure that it is installed as the default Java installation. You can do this by entering the following commands while logged in as root:

# update-alternatives --install "/usr/bin/java" "java" "java-install-path" 1
# update-alternatives --set java java-install-path

where java-install-path is the path of the location in which you installed Java (for example, /usr/lib/jvm/jdk1.7.0_11/jre/bin/java).

Verify that Java is correctly installed by entering:

# java -version

This should result in output something like this:

java version "1.7.0_11"
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)