To run Selenium Grid, you need a valid Java 5+ JDK install on your system.
Mac OS X
If you are running Mac OS X you can safely skip this step — the system comes with a ready-to-use Java runtime and development environment.
Need more detailed instructions? Check out our step-by-step installation instructions for Mac OS X.
Ubuntu
If you are running Ubuntu 8.04 "Hardy Heron", the easier way to install the JDK is to run:
sudo apt-get install sun-java6-jdk
Other Systems
Download Java 6 JDK,
install it on your file system and make sure it is in your PATH:
$ java -version java version "1.6.0" Java(TM) SE Runtime Environment (build 1.6.0-b105) Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
