http://plugindoc.mozdev.org/linux.html#Java
Java Runtime Environment
Version: 1.4.2_05 and later
Install Step
1. Install Java Runtime Environment.
2. Make a symbolic linkto libjavaplugin_oji.so in your Mozilla Plugins
directory.
Important notes: Do not copy the plugin to your plugs directory.
If you do, Mozilla will crash any time you attempt to view a page containing a
Java applet.