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Pre-requisites

Java 7	Fedora 4 is built and tested using Java 7, and uses some Java 7+ features
Maven 3	The Fedora 4 build uses Maven.
Git	The Fedora repositories are on Github

Fedora users git, hosted on GitHub, for version control. You can find the main repository at http://github.com/futures.

There is a style guide, which should prevent some extravagant commits full of formatting changes.

Use mvn verify to run tests, mvn install to build and install in local Maven repository (where it can be found by other local projects).
When adding new classes, they should probably not go in the kernel. Look for a submodule or separate project that's appropriate for the functionality you're adding. Ask if it's not clear where something should go.
fcrepo-http-api (https://github.com/futures/fcrepo4/tree/master/fcrepo-http-api) is a good example to follow when setting up new modules (though new modules should be in a separate repo, not in fcrepo4).
fcrepo-kitchen-sink is a project that pulls everything into a single build for demo purposes.
New modules added to fcrepo-kitchen-sink need to be added to jenkins (who can do this? anything else?)