This post explains how to install Java or check which version is running on your machine. Install on any OS, and learn about the JDK.

Oracle's newly released Java 7 runtime is relatively painless to install and uninstall.

Which version of Java should you use in Linux? Learn how to easily switch between different versions with a tutorial from Jack Wallen.

The main download page notes that the JRE is included in all versions except those for Linux and OS X, adding this explanation: Java is required for complete OpenOffice.org functionality.

Jack Wallen walks you through the process of deploying the open-source GlassFish Java Application server on the latest release of Ubuntu Server.