More efficiently dependency management for Java packages
The way that Java dependencies are handled has changed in Fedora 21. Packages that do not interact with the X server or audio subsystem, now depend on a new OpenJDK headless subpackage. This means installation size reduction on servers, a change that aims for efficiency.
Java packaging guidelines now require to convert most Java packages to have "Requires: java-headless" when appropriate. Changes can be found at Fedora wiki:
Javadocs subpackages no longer mandatory
Another change to Java packaging guidelines regards to Javadocs subpackages, which are now optional in Fedora packages.
Update to OpenJDK 8
OpenJDK8 is now the default Java Runtime in Fedora, replacing OpenJDK7. A full list of the features added in OpenJDK7 is available upstream at http://openjdk.java.net/projects/jdk8/features/.