Oh, how the mighty have fallen. This is what developer.apple.com/java read back in 2009 [0]:

Mac OS X is the only major consumer operating system that comes complete with a fully configured and ready-to-use Java runtime and development environment. Professional Java developers are increasingly turning to the feature-rich Mac OS X as the operating system of choice for both Mac-based and cross-platform Java development projects. Mac OS X includes the full version of J2SE 1.5, pre-installed with the Java Development Kit (JDK) and the HotSpot virtual machine (VM), so you don't have to download, install, or configure anything.

Deploying Java applications on Mac OS X takes advantage of many built-in features, including 64-bit support, resolution independence, automatic support of multiprocessor hardware, native support for the Java Accessibility API, and the native Aqua look and feel. As a result, Java applications on Mac OS X look and perform like native applications on Mac OS X.

[0] http://wayback.archive.org/web/20091223033016/http://develop...

i believe they banned apps that depend on the system java.

you can still include your own JRE.

There are lots of apps in the app store written in Java. However they have to ship a bundled JRE themselves.

Oddly, Oracle provide a tool to create a DMG with a .app inside that has a bundled inside. It's very easy to use. Doing this means your users don't need to install Java themselves anymore. Seems like the left hand cutting off the revenue stream of the right hand, but hey, I'm not complaining.