Which OS ?
You must install java jdk as is explained in installation guide. Normally when you install java, is automatically set java running path in your OS environment, you need to set java home if you've got serveral java versions installed in the same server.
Because information matters
how to set java_home
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The Sun Developers site has instructions on setting the JAVA_HOME variable in both Linux and Windows.
http://developers.sun.com/docs/javacaps ... ome_t.html
http://developers.sun.com/docs/javacaps ... ome_t.html
If you are using Windows OS, please open [Control Pananel]->[System]->[Advanced]tab->[Environment variables].
In the System variable section, add a variable "JAVA_Home" and the value (ex. C:\java Version).
In the System variable section, add a variable "JAVA_Home" and the value (ex. C:\java Version).