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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