...
Java SE Development Kit (JDK) 6.
Whether installing a binary or source distribution, JDK 6 is required. The JDK should be installed on the machine you intend to use as the Fedora server. It is available from http://www.java.sun.com/com/. While historically we have recommended Sun/Oracle's JDK, there have been several reports of success in using OpenJDK as well. Look here for more information on installing Java.
...